United States Patent [191
`Greenwaldt
`
`1|||||m||||| m |||||||||1 51511415111101 ||||| ||||1| ||| |||||||||
`[11] Patent Number:
`5,499,014
`[45] Date of Patent:
`Mar. 12, 1996
`
`[54] SECURITY ALARM SYSTEM
`
`4,908,604
`
`3/1990 Jacob .................................... .. 340/528
`
`Inventor: Gordon E_ Greenwaldt’
`
`
`
`4,935,587 4,990,888
`
`
`
`6/1990 Pattermann .... .. 2/1991 Vogt ...................................... .. 340/545
`
`North, Brooklyn Park, Minn. 55445
`
`[21] Appl' No‘: 270’145
`[22] Filed:
`Jul. 1, 1994
`
`[51] Int. Cl.6 ..................................................... .. G08B 1/08
`_
`_
`[52] U_.S. Cl. ......................... .. 340/539, 340/545, 340/531
`[58] Field Of Search ................................... .. 340/545, 546,
`340,531’ 521’ 584’ 5281 539
`,
`References cued
`U_S_ PATENT DOCUMENTS
`
`[56]
`
`Primary Examiner_John K. Pang
`Assistant Examiner—Albert K. Wong
`Attorney, Agent, or Firm-Kinney & Lange
`[57]
`ABSTRACT
`
`.
`.
`.
`.
`.
`A security alarm system includes a wireless transmitter unit,
`3 portabls control unit’ and a receiver unit The transmitter
`unit includes a Sensor for detecting the Opening of a duo!- or
`window to a protected area and an alarm signal generator for
`providing an alarm signal wherein the alarm signal generator
`is controlled by the sensor. The control unit includes an arm
`signal generator for providing and transmitting an arm signal
`and a disarm signal generator for providing and transmitting
`a disarm signal_ The receiver unit includes an alarm for
`indicating unauthorized opening of the door or window to
`the protected area, a ?rst circuit for receiving the alarm
`.
`.
`.
`.
`.
`slgnal from thefransmltter “mt 311‘? acPvatmg 9931mm
`when the alarm is armed, a second circuit for receiving the
`arm signal from the control unit and arming the alarm, and
`a third circuit for receiving the disarm signal from the
`control unit and disarming the alarm and for turning the
`alarm 011' when the alann is activated_
`
`9 Claims, 4 Drawing Sheets
`
`3/1971 Beck .............................. .. ZOO/61.93
`gut}? et a1‘
`3’827’O38
`7/1974 ‘5.6x. er ' ' ' ' ‘ ' ' ' ' ‘
`,
`,
`illis ....... ..
`3,833,895 9/1974 Fecteau ........ ..
`3,909,722
`9/1975 Bennett’ In
`3,969,709 7/1976 Isaacs et al.
`4,148,019
`4/1979 Durkee
`4,150,369
`4/1979 Gaspari .... ..
`BOUChHI'd ...
`340/539
`6/1982 Schae?er
`. 340/545
`6/1982 Iwata ........ ..
`8/1985 Shigemitsu ........................... .. 340/545
`
`' ' ' "
`
`340/224
`
`340/224
`_____ " 325/45
`340/224
`340/545
`340/545
`
`3,567,882
`
`4,335,375
`4,337,454
`4,536,751
`
`SAMSUNG EXHIBIT 1009
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`Page 1 of 10
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`US. Patent
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`Mar. 12, 1996
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`Sheet 1 0f 4
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`5,499,014
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`Page 2 of 10
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`

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`US. Patent
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`Mar. 12, 1996
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`Sheet 2 of 4
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`5,499,014
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`L.__.....____._..._..____. ___...|
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`Page 3 of 10
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`US. Patent
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`Mar. 12, 1996
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`Sheet 3 of 4
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`5,499,014
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`Page 4 of 10
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`U.S. Patent
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`Mar. 12, 1996
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`Sheet 4 of 4
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`5,499,014
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`IIIIIIIII IIIIIIIIIIII IIIIII I II Ik
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`Page 5 of 10
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`1
`SECURITY ALARM SYSTEM
`
`2
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`5,499,014
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`BACKGROUND OF THE INVENTION
`
`The present invention relates to security alarm systems,
`and more particularly, to a wireless security alarm system for
`detecting the unauthorized opening of a window or door to
`a protected area.
`In the past, security alarms have typically involved com
`plex circuitry and components which were di?icult to install
`dif?cult or impossible to remove and use in other locations,
`and expensive to purchase. Wireless systems have been
`proposed and have included various sensors to determine the
`unauthorized opening of a window or a door to a protected
`area which would trigger a receiver alarm unit located
`somewhere else in the house or building. However, these
`units typically require a key switch to activate and deactivate
`the alarm unit to prohibit unauthorized persons from deac
`tivating the alarm. The key switches are time consuming and
`inconvenient to operate.
`Hand held control units have been provided with an
`emergency panic switch to trigger the alarm to summon help
`in the event an intruder is spotted in the dwelling or in the
`event of an illness or injury. These hand held units have also
`been provided with inhibit switches which temporarily deac
`tivate the alarm to allow entry to and exit from the protected
`area without setting oil the alarm. However, all of these
`wireless security alarm systems are ?xed to the building,
`house or other object being protected so that they are
`di?icult to remove and use in other locations. In addition,
`since these “?xed” units are di?icult to install they are often
`very expensive to purchase. It is desirable to provide a
`wireless portable security alarm which is inexpensive, easy
`to manufacture and easy to install and reinstall in a variety
`of locations such as in homes, cars, boats, campers, trucks
`etc.
`
`SUMMARY OF THE INVENTION
`
`15
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`25
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`40
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`The present invention relates to a security alarm system
`having a portable wireless transmitter unit, a portable wire—
`less control unit, and a portable wireless receiver unit. The
`transmitter unit includes a mounting member for removable
`attaching the transmitter unit to a door or window, a sensor
`for detecting the opening of the door or window and an
`alarm signal generator (controlled by the sensor) for pro
`viding an alarm signal. The control unit includes an arm
`signal generator for providing and transmitting an arm signal
`and a disarm signal generator for providing and transmitting
`a disarm signal. The receiver unit is operable stand alone or
`when connected to an external power source. The receiver
`unit includes an alarm for indicating unauthorized opening
`of the door or window to the protected area, a ?rst circuit for
`receiving the alarm signal from the transmitter unit and
`activating the alarm when the alarm is armed, a second
`circuit for receiving the arm signal from the control unit and
`arming the alarm, and a third circuit for receiving the disarm
`signal from the control unit and disarming the alarm and for
`turning the alarm off when the alarm is activated.
`In one embodiment, the portable control unit of the
`security alarm further includes a panic signal generator for
`providing and transmitting a panic signal and the receiver
`unit further includes a fourth circuit for receiving the panic
`signal from the control unit and activating the alarm when
`the alarm is armed.
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`55
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`FIG. 1 is a perspective view of the security alarm system
`according present invention.
`FIG. 2 is a schematic diagram of the wireless transmitter
`unit of the security alarm system according to the present
`invention.
`FIG. 3 is a schematic diagram of a portable control unit
`of the security alarm system according to the present inven
`tion.
`FIG. 4 is a schematic diagram of the receiver/alarm unit
`of the security alarm system according to the present inven
`tion.
`
`DETAILED DESCRIPTION OF THE PRE
`FERRED EMBODIMENTS
`
`Referring to FIG. 1, a security alarm system 10 is illus
`trated in a house, building or other protected area for
`providing alarm indications in response to an unauthorized
`entry into a protected area. The security alarm system 10
`includes at least one wireless portable transmitter unit 12, a
`portable wireless receiver alarm unit 14 and a portable
`wireless control unit 20. As shown in FIG. 1, wireless
`portable transmitter unit 12 is mounted to a door or window
`within the house for detecting the opening of the door or
`window and for providing an alarm trip signal in response to
`the opening of the door or window. The transmitter unit is
`mounted to a door or window frame by nails, screws, bolts,
`adhesive or other similar mounting means which permits
`easy mounting and easy removal of the transmitter unit. The
`portable receiver alarm unit 14 is mounted to a wall outlet
`16 in the house and includes an alarm 15 Portable control
`unit 20 provides a panic signal, an arm signal, and a disarm
`signal. The panic signal triggers the alarm 15 in the event the
`user is surprised by an intruder in the protected premises or
`in the event the user is seeking help or assistance for other
`reasons. The arm signal arms the alarm 15 so that it can be
`activated when the alarm trip signal is received. The disarm
`signal disarrns the alarm 15 so that it cannot be activated by
`the alarm trip signal and also turns o?‘ the alarm 15 after it
`has been triggered.
`As shown in FIG. 2, transmitter unit 12 includes a sensor
`22 for detecting the opening of the door or window, an alarm
`signal encoder 26 for providing the alarm trip signal in
`response to the activation of sensor 22, and an alarm signal
`generator 28 for transmitting the encoded alarm trip signal
`to the receiver unit 14.
`The sensor 22 may be any type of electrical, mechanical
`or magnetic switch and is illustrated as a pushbutton elec
`trical switch 32 which is normally open when the door or
`window is closed. When the door or window is opened the
`switch 32 closes to activate the alarm signal generator 26.
`By connecting the switch 32 to ground, (ground side switch
`ing) the entire circuitry for the transmitter unit 12 is “oil”
`thereby extending battery life. The sensor 22 provides an
`activation signal to the alarm signal encoder 26 along line
`34. In addition, the pushbutton switch 32 closes the circuits
`for the alarm signal encoder 26 and the alarm signal gen
`erator 28. Although the illustrated transmitter unit will
`continuously transmits the alarm trip signal after the push
`button switch 32 is closed until the door or window is closed,
`a timed disarm circuit (not shown) may be provided to
`automatically disarm the transmitter after a predetermined
`time to save battery life. Additionally, it is within the
`intended scope of the invention to provide a timed pulse or
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`5,499,014
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`burst alarm trip signal over ?xed time period, enough to
`activate the alarm 15 in the receiver unit 14 but short enough
`to save battery life. In the latter scenario the receiver unit
`would have a timed disarmed circuit (not shown) to auto
`matically disarm the receiver unit after a predetermined
`t1me.
`The alarm signal encoder 26 includes a Holtek HT-l2E
`encoder 40, and a series of eight (8) dip switches 41
`connected to the encoder 40 inputs. The encoder 40 encodes
`12 bits of information which represents the alarm trip signal
`and serially transmits this information from pin Dam upon
`receipt of the activation signal at pin TE on line 34. The 12
`bits of encoded information includes eight bits which are set
`by the dip switches 41 which are connected to the pins
`A0-A7 of the HT-l2E encoder 40 and four data input bits at
`pins D0—D3 of the HT-12E encoder 40. The dip switches 41
`are set in a particular con?guration to change the encoded
`alarm trip signal at pin Dam. The eight dip switches provide
`256 encodable signal combinations to prevent users from
`inadvertently activating the receiver unit 14 in someone
`else’s house. The data inputs pins D3, D2, D1 and D0 of the
`HT-l2E encoder 40 represent the particular “type” of signal
`being transmitted by the encoder 40. For example, the D3
`input of the HT-l2E encoder 40 represents the panic signal,
`the D2 input of the HT-l2E encoder 40 represents an alarm
`trip signal, the D1 input of the HT-l2E encoder 40 indicates
`an arm signal, and the DO input of the HT-l2E encoder 40
`represents a disarm signal. Therefore, the “type” of signal
`transmitted by the HT-12E encoder 40 depends on which of
`pins D3-D0 receives a low activation signal. Since the
`transmitter unit 12 only sends the alarm trip signal data input
`pins D3, D1 and D0 of the HT-l2E encoder 40 are connected
`to a 9V battery source 47 so that they are held at a high logic
`level. Pin D2 of the HT-l2E encoder 40 is connected to
`ground through the pushbutton switch 22. When the push
`button switch 22 is closed a low logic signal is sent to pin
`D2 causing the alarm trip signal to be transmitted to the
`receiver unit 14.
`The HT-12E encoder 40 includes an internal oscillator for
`outputting an encoded alarm signal at a ?rst frequency set by
`the internal oscillator. The HT-l2E uses a resistor 46
`between pins OSCl and OSC2 to set the data rate. Prefer
`ably resistor 46 is l.l MQ. which provides a frequency of 3
`kHz for the encoded signal at pin Dam.
`Alarm signal generator 28 transmits the encoded alarm
`trip signal from pin D0", of the HT-l2E encoder 40 using a
`carrier signal created by an oscillator circuit 48. Oscillator
`circuit 48 includes a crystal 50 to control the transmission
`frequency, a resistor 52 in parallel with the crystal 50 and a
`NAND gate 59. Crystal 50 and resistor 52 are connected in
`parallel across both inputs and the output of NAND gate 59.
`Crystal 50 is selected such that the transmission frequency
`is 27 MHz, which is the current FCC assigned frequency for
`unlicensed transmitters. A resistor 54 is positioned between
`the inputs to NAND gate 59 and ground.
`The data output pin, D0,“, of the HT-12E encoder 40
`controls the output from oscillator circuit 48 through a
`NAND gate 60. One input of NAND gate 60 is connected to
`the output of NAND gate 59 of oscillator circuit 48 while the
`other input to NAND gate 60 is connected to pin D0“, of the
`HT-12E encoder 40. The alarm trip signal outputted at pin
`Dam of the HT-12E encoder 40 therefore is combined and
`carried with the output of oscillator circuit 48 depending on
`the activation signal created by the pushbutton sensor switch
`32.
`The output of NAND gate 60 is connected to the inputs of
`a NAND gate 62 for inverting the alarm trip signal. The
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`output of NAND gate 60 is also connected with the output
`of NAND gate 62 through a capacitor 68, a resistor 70, a
`capacitor 72, a resistor 74 and a capacitor 76. A primary
`winding 80A of a transformer 80 is connected in parallel
`across capacitor 72 so that the voltage difference across
`capacitor 72 drives the transformer 80. A secondary winding
`80B of transformer 80 has one end connected to the antenna
`30 for transmitting the alarm trip signal to the receiver unit
`14. The other end of secondary winding 80B is connected to
`pin TE of encoder 40 and to ground through pushbutton
`switch 22. When the door or window is opened, pushbutton
`switch 22 is closed thereby causing a low logic signal at pin
`TE of the HT-12E encoder 40 and closing the circuit for the
`alarm signal encoder 26 and for the alarm signal generator
`28. The alarm trip signal at pin D0,‘, of the HT~12E encoder
`40 is combined with the carrier signal created by the
`oscillator circuit 48. The antenna 30 then transnrits the alarm
`trip signal continuously to receiver unit 14 while the door or
`window is opened.
`As shown in FIG. 3, portable control unit 20 includes a
`panic switch 90 for triggering a panic signal, an arm switch
`92 for triggering an arm signal, a disarm switch 96 for
`triggering a disarm signal, a signal encoder 100 for encoding
`the panic signal, arm signal and disarm signal in response to
`activation of panic switch 90, arm switch 92 and disarm
`switch 94, respectively, and a signal generator 102 for
`transmitting the panic signal, arm signal and disarm signal
`to receiver unit 14.
`Panic switch 90, arm switch 94 and disarm switch 96 are,
`for example, pushbutton switches which are normally open
`such that when an operator pushes one of the buttons the
`switch is closed, thereby generating the desired function.
`The signal encoder 100 includes dip switches 101 identical
`to the dip switches 41 on the transmitter unit 12 for encoding
`the ?rst eight bits of the encoded panic signal, arm signal and
`disarm signal. Preferably, the dip switches 101 are set the
`same as the dip switches 41 on the transmitter unit 12. Signal
`encoder 100 also includes an HT-l2E encoder 104, which is
`con?gured with an internal oscillator the same as in the
`transmitter unit 12 shown in FIG. 2. Panic switch 90 is
`connected to pin D3 of the HT-l2E encoder 104 through a
`diode 108 and to a 9 Volt voltage source 109 through a
`resistor 110. Arm switch 92 is connected to pin D1 of the
`HT-12E encoder 104 through a diode 112 and to voltage
`source 109 through a resistor 114. Disarrn switch 94 is
`connected to pin D0 of the HT-l2E encoder 104 through a
`diode 116 and to voltage source 109 through a resistor 118.
`Thus, the resistors 110, 114 and 118 act as pull-up resistors
`which connect pins D3, D1 and D0 to the voltage source
`109. Voltage source 109, which is preferably a 9 V battery,
`is connected to pin D2 of the HT-l2E encoder 104 for
`providing a high logic signal, since the alarm trip signal is
`being sent by transmitter unit 12 (see FIG. 2). Panic switch
`90, arm switch 92 and disarm switch 94 are connected
`through diodes 120, 122, and 124, respectively, to alarm
`signal generator 102. Diodes 108, 112, 116, 120, 122, and
`124 are biased to isolate panic switch 90, arm switch 94 and
`disarm switch 96. Thus, when a switch 90, 94, 96 is closed
`the respective pin D3, D1 or DO on the HT-l2E encoder 104
`receives a low logic signal causing the appropriate signal to
`be transmitted to receiver unit 14. Depression of a pushbut
`ton switch supplies power to alarm signal generator 102 for
`transmitting theappropriate signal from the control unit 20
`only while the button remains depressed.
`Alarm signal generator 102 of control unit 20 is identical
`in structure and operation to the alarm signal generator 28 in
`the transmitter unit 12 and so reference is made to the related
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`description of FIG. 2 wherein the same reference numbers
`are used in FIG. 3 increased by one-hundred In addition, the
`internal oscillator of the HT- 1 2E encoder 104 is set to 3 kHz,
`which is the same as the frequency of the signal transmitted
`by the transmitted unit 12, by using a 1.1MQ resistor 105
`between pins OSC1 and OSC2 of the HT-12E encoder 104.
`As with the HT-l2E encoder 40, the signal output from the
`pin Dam of the HT-12E encoder 104 is dependent upon
`which of the switches 90, 94, 96 is activated due to the
`internal architecture of the HT-12E encoder 104. The
`encoded signal at the pin D0", of the HT-l2E encoder 104 is
`connected to NAND gate 160 as in the transmitter unit 12,
`so that either the panic signal, arm signal or disarm signal is
`transmitted at 27 MHz from the antenna 130 to the receiver
`unit 14 depending upon which pushbutton switch 90, 92, 94
`is depressed.
`As shown in FIG. 4, receiver unit 14 includes the alarm
`15 for indicating unauthorized opening of the door or
`window in a protected area, a receiver circuit 202 for
`receiving the encoded alarm trip signal from transmitter 12
`and the encoded panic signal, arm signal and disarm signal
`from control unit 20, a signal decoder 204 for decoding the
`encoded signals and logic circuitry 208 for arming, tripping
`and disarming the alarm 15.
`The receiver unit 14 is constructed, for example, from a
`RF Decoder/Receiver, part no. RIB-99, available from Ming
`Engineering and Products, Inc, 17921 Rowland Street, City
`of Industry, Calif. 91748. Receiver circuitry 202 on the RF
`Decoder/Receiver includes an antenna 205 and a Super
`Regenerative AM Receiver for receiving electromechanical
`signals transmitted from transmitter unit 12 and control unit
`20. Receiver circuitry 202 ?lters signals at 27 MHz so that
`the trip signal, panic signal, arm signal, and disarm signal
`are fed into decoder 204 along line 210. Receiver circuitry
`202 is well known to those skilled in the art and so is shown
`in block format. Signals from the transmitter 12 and the
`control unit 20 are received form the antenna 205 and fed
`through the receiver circuitry 202 into the pin Din on a
`Holtek HT-12D decoder 220. Dip switches 221 are set
`identical to dip switches 41 and 101 on transmitter unit 12
`and control unit 20, respectively. Within the HT-12D
`decoder 220 there are comparators for differentiating
`between the panic signal, trip signal, arm signal and disarm
`signal. After the signal has been decoded it is then sent to the
`appropriate output pin D3, D2, D1 and D0, respectively, of
`the HT-12D decoder 220. The data outputs D3—D0 are
`latched within the HT-12D so that they are maintained in
`their current state until another transmission is received at
`pin Din. The operation of the internal oscillator in the Holtek
`HT-l2D decoder 220 on the unit 14 is identical to the
`operation of the internal oscillator on transmitter unit 12 and
`control unit 20. A resistor 225, preferably 1.1MQ between
`OSCl and OSC22 sets the frequency of the output signals at
`3 KHZ.
`Alarm 15 may be a bell, siren or horn as is well known in
`the art. Alarm 15 is connected to a power supply 231 through
`a transistor 230. That is, the collector of transistor 230 is
`connected to alarm 15 and the emitter of transistor 230 is
`connected to power supply 231, so that transistor 230 acts as
`a switch which activates alarm 15 depending on the signal
`at the base of transistor 230. The power supply 23 1 operates
`on both AC from a household 120/240 volt supply and on
`DC through a battery backup to supply power to alarm 15 in
`the event of a failure of the household power source. The DC
`battery backup is su?icient to last several months, preferably
`65
`one year or more, so that the security alarm system 10 may
`be used independently of a household power supply.
`
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`The output pins D0—D3 of the HT-l2D decoder 220 are
`connected through logic circuity 208 to the base of transistor
`230. Output pin D3 of the HT~12D decoder 220 represents
`the panic signal and is connected to the inputs of a NAND
`gate 234 for inverting the low signal transmitted at pin D3.
`The output of NAND gate 234 is connected through to a
`resistor 236 and a diode 237 to the base of a transistor 232.
`The emitter of transistor 232 is connected to ground and the
`collector of transistor 232 is connected to the base of
`transistor 230 through a resistor 238, and to the power
`supply 231 through a resistor 240. A low signal at pin D3
`from the panic signal is inverted by NAND gate 234, which
`turns transistor 232 “on” thereby turning transistor 230 “on”
`to activate the alarm 15.
`Pins D1 and D0 of the HT-12D decoder 220 represent the
`arm and disarm signals, respectively, and are connected to
`the inputs of respective NAND gates 240 and 242. The
`outputs of NAND gates 240 and 242 are connected to the
`input of the other respective NAND gate 242 and 240 to
`form an SR ?ip ?op or latch. The output of NAND gate 240
`is connected to the base of a transistor 244 through a resistor
`246. The emitter of transistor 244 is connected to ground and
`the collector of transistor 224 is connected to the emitter of
`a transistor 250 which acts as a trip signal switch. When a
`disarm signal is outputted at pin D0 of the HT-l2D decoder
`220, transistor 224 is turned “011" so that the trip signal, if
`received, cannot activate alarm 15. The feedback between
`the output of NAND gate 240 and the input of NAND gate
`242 provides an SR latch which maintains the output of
`NAND gate 240 after the arm signal is removed from the
`input of NAND gate 240 and after the disarm signal is
`removed from the input of NAND gate 242. Thus, the
`disarm signal outputted at pin D0 of the HT-l2D decoder
`220 turns transistor 244 “o?” which prevents the needed
`voltage drop across the base-emitter junction of transistor
`230. In other words, regardless of the state of transistor 250
`due to the trip signal, the alarm circuit is open and the alarm
`15 will not be activated if the disarm signal has turned
`transistor 244 “off”.
`When an aim signal is outputted at pin D1 of the PIT-12D
`decoder 220, the state of the SR ?ip ?op is reversed so that
`the output at NAND gate 240 is high thereby turning
`transistor 244 “on” which will permit the needed voltage
`drop across the base-emitter junction of transistor 230. In
`other words, the alarm circuit is now closed, and alarm 15
`will be activated depending on the state of transistor 250
`dictated by the alarm trip signal.
`Pin D2 of the HT-12D decoder 220 is connected to the
`inputs of NAND gate 252 which inverts the low alarm trip
`signal when received. The output of the NAND gate 252 is
`connected to the base of transistor 250 through a resistor
`254. The collector of transistor 250 is connected to the base
`of transistor 230 through resistor 238, to power supply 231
`through resistor 240 and to the collector of transistor 232.
`The emitter of transistor 250 is connected to the collector of
`transistor 244. When a trip signal is outputted at pin D2,
`NAND gate 252 inverts the low signal which then provides
`a su?icient voltage drop across the base-emitter junction of
`transistor 250, thereby turning transistor 250 “on”. When the
`receiver unit 14 is armed, that is, when transistor 244 is “on”,
`the activation of transistor 250 turns transistor 230 is then
`turned “on”which activates alarm 15.
`The receiver unit 14 noti?es the user of the arming and
`disarming of the alarm 15 by providing an audible “chirp”.
`The chirp is sounded by activation of the transistor 232
`similar to the activation of the alarm when the panic button
`is pressed. More speci?cally, the base of transistor 232 is
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`connected to pin VT of the HT-l2D decoder 220 through a
`capacitor 239 and a resistor 241. Pin VT provides a high
`signal any time a “valed transmission” signal (arm signal,
`disarm signal, panic signal, alarm trip signal) is decoded by
`HT-12D decoder 220. The size of the capacitor 239 deter
`mines the length of time transistor is “on”and therefore the
`time period of the chirp.
`In the event the HT-12D decoder 220 malfunctions when
`turned on and does not disable the outputs at pins D3—D0
`which otherwise would cause inadvertent sounding of alarm
`15, the logic circuitry 208 includes a disable circuit 275. The
`disable circuit disables the alarm 15 by “open circuitry” the
`alarm circuit. The disable circuit includes transistor 276,
`resistor 278, NAND gates 280, 282 and 284, resistor 286,
`diode 288 and capacitor 290. The collector of transistor 276
`is connected to alarm 15. The emitter of transistor 276 is
`connected to ground. The base of transistor 276 is connected
`to pin VT of the HT-12D decoder 220 such that when any
`transmission signal is received by the receiver unit 14, the
`transistor 276 is turned “on” and maintained “on”until the
`power supply 231 is disconnected. More speci?cally, pin VT
`is connected to inputs of NAND gate 284. The output of
`NAND gate 284 is connected to one of the inputs of NAND
`gate 282. One of the inputs of NAND gate 280 is maintained
`at a high logic level by capacitor 290 which is connected to
`power supply 231 through resistor 286 and diode 288.
`NAND gate 280 and 282 form an SR latch which maintain
`a low logic signal at the output of NAND gate 282 until any
`transmission signal causes a high signal at pin VT which
`permanently activates transistor 276 until power supply 231
`is disconnected.
`An additional level of security may be obtained by
`providing a “911” transmitter (not shown) is associated with
`the alarm/receiver unit 14. The “911” transmitter would
`notify a police headquarters over the “911” emergency
`telephone lines when the alarm 15 is activated to provide
`immediate and assured police attention.
`Thus, the security alarm system 10 according to the
`present invention provides a wireless portable security sys
`tem which is inexpensive due to the simplicity of its com
`ponents, operations and manner of installation and use. The
`portable receiver unit includes an alarm and is mounted to
`any household power outlet. The portable transmitter unit 12
`easily mounts to any window for activating the alarm upon
`an unauthorized entry. The portable hand-held remote con
`trol unit 20 is a convenient ‘and easy to use unit for arming
`and disarming the alarm and for activating an alarm panic
`mode at the push of a button.
`Although the present‘invention has been described with
`reference to preferred embodiments, workers skilled in the
`art will recognize that changes may be made in form and
`detail without departing from the spirit and scope of the
`invention.
`What is claimed is:
`I. A portable security alarm system consisting of:
`a portable wireless transmitter unit including:
`sensor means for detecting the opening of a door or
`window in a protected area;
`alarm signal generating means for providing an alarm
`signal, the alarm signal generating means being
`controlled by the sensor means;
`
`8
`mounting means for removably attaching the transmitter
`unit to a door or window so that the transmitter is
`portable;
`a portable wireless control unit which provides the exclu
`sive means for arming and disarming the alarm system,
`the control unit including:
`emergency panic signal generating means including a
`panic button for providing and transmitting an emer
`gency panic signal;
`arm signal generating means including an arm button
`for providing and transmitting an arm signal;
`disarm signal generating means including a disarm
`button for providing and transmitting a disarm sig
`nal; and
`a portable wireless receiver unit operable stand alone and
`when connected to an external power source, the
`receiver unit does not have any control indicators
`thereon such that the receiver unit can be located in an
`out-of-the-way or hidden location, the receiver unit
`including:
`an audible alarm for indicating unauthorized opening of
`the door or window in the protected area;
`?rst circuit means for receiving the alarm signal
`directly from the transmitter unit and activating the
`alarm when the alarm is armed via a direct electrical
`connection to the alarm;
`second circuit means for receiving the arm signal from
`the control unit and arming the alarm;
`third circuit means for receiving the disarm signal from
`the control unit and disarming the alarm and for
`turning the alarm off when the alarm is activated; and
`fourth circuit means for receiving the emergency panic
`signal from the control unit and activating the alarm
`whether or not the alarm is armed.
`2. The security alarm of claim 1, wherein the receiver unit
`includes means audible for indicating that the alarm is armed
`and disarmed.
`3. The security alarm of claim 1, wherein the mounting
`means is selected from a group consisting of nails, screws
`bolts and adhesive.
`4. The security alarm of claim 1, wherein the receiver unit
`further includes electrical connection means for connecting
`the receiver unit to a standard household power source.
`5. The security alarm of claim 4, wherein the receiver unit
`further includes battery backup means for powering the
`receiver unit in the event of a failure of the household power
`source.
`6. The security alarm of claim 1, wherein the sensor
`means is a pushbutton switch.
`7. The security alarm of claim 1, wherein the arm signal
`generating means includes a pushbutton switch which is
`normally open so that when the switch is activated the arm
`signal is transmitted to the receiver unit.
`8. The security alarm of claim 1, wherein the disarm
`signal generating means includes a pushbutton switch which
`is normally open so that when the switch is activated the
`disarm signal is transmitted to the receiver unit.
`9. The wireless, portable security alarm system of claim
`1, wherein the transmitter unit includes a magnetic sensor
`for detecting the opening of the door or window, and for
`providing the alarm signal in response thereto.
`
`*****
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`Page 9 of 10
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`

`
`UNITED STATES PATENT AND TRADEMARK OFFICE
`CERTIFICATE OF CORRECTION
`
`PATENTNO. ; 5,499,014
`DATED
`1 March 12, 1996
`'NVENT°R<$) I GORDON E. GREENWALDT
`
`It is certi?ed that error appears in the above-indenti?ed patent and that said Letters Patent is hereby
`corrected as shown below:
`
`On the title page item [54]; and col. 1, line 1, in the title before
`
`"SECURITY", insert -- PORTABLE-
`
`Col. 1, line 42, after "relates to a ", insert -po1tab1e-
`
`Signed and Sealed this
`
`Twenty-??h Day of June, 1996
`
`Arrest:
`
`6&4
`
`BRUCE LEHMAN
`
`Arresting O?icer
`
`Commissioner of Patents and Trademarks
`
`Page 10 of 10
`
`Page 10 of 10