United States Patent
`
`[19]
`
`[11] Patent Number:
`
`4,945,448
`
`Bremenour et al.
`
`[45] Date of Patent:
`
`Jul. 31, 1990
`
`4,648,066
`4,654,818
`4,654,829
`4,763,300
`
`3/1937 Pitt . .... .....
`. .. .. 364/900
`3/1987 Wetterau,
`1-
`364/900
`
`3/1937 Jiang et al.
`..
`365/229
`3/1933 Yukawa .............................. .. 365/52
`1
`FOREIGN PATENT DOCUMENTS
`0037733
`9/1933 European Pat. orr. ............ 361/392
`3533419
`3/1937 Fed. Rep. of Germany ...... 361/399
`3630397
`3/1988 Fed. Rep. of Germany .
`Primary Examiner-—Gregory D. Thompson
`Attorney, Agent, or Firm—Quarles & Brady
`
`[57]
`
`‘
`
`ABSTRACT
`
`A memory cartridge for convenient manual attachment
`°f 3 RAM m°m°"' with b‘“‘°"' b“°k'“p ‘° 3" 1/0
`module in aprogrammable controller system 1S inserted
`through an opening in a side cover of the I/O module
`and connected to a main circuit board. The housing has
`a pair of clip members on opposite ends with grooves
`m
`g transversely across the ends to receive the
`edges of mounting flanges extending inward at upper
`and lower ends of an opening in the side cover. The clip
`members are yieldable in the longitudinal direction of
`the cartridge housing-—to squeezed between a thumb
`and fingers of one hand——-and when the cartridge is
`-
`h
`-
`-
`-
`Inserted through 1: 6 side Cover Opemng to a certain
`depth, the clip members are released to secure the car-
`tridge between the mounting flanges.
`
`10 Claims, 3 Drawing Sheets
`
`NU MARK Ex.1021 p.1
`
`[75]
`
`[54] MEMORY CARTRIDGE FOR A cnzcurr
`BOARD MODULE
`_
`_
`Inventors: Edwin L. Bremenour. Euchd;
`Michael F. Tratar; Gerald S. Pepera,
`both of Memo,’ an of Ohio
`73 A -
`: All
`_B dl C
`In _
`]
`smgnee Mi1‘:':,au'l:e,°§Vis‘_’mp“y’
`°’
`
`1
`
`[21] APPL No‘: 325’220
`[22] Filed;
`Mar. 17, 1989
`
`Int. Cl.5 .......................... H05K 7/20; HOSK 1/14
`[51]
`[52] US. Cl. .................................... 361/383; 361/395;
`361/399; 364/704; 365/52
`361/380 333 334 391-395
`[53] Field of Search
`361/399’ 413; 364/704; 365/52, 226, 229
`
`R¢f¢|'¢fl¢¢-S Cited
`U_s_ PATENT DOCUMENTS
`3,547,274 12/1970 Sosinkski ............................. 361/394
`4,216,522
`8/1980 Slagel et al.
`..
`“ 361/392
`4,295,181 10/1981 Chang et a1.
`..
`361/395
`4,482,938 11/1984 Norden
`__ 351/394
`. .... 365/52
`4,502,130 2/1985 Kuckuk .....
`-- 361/424
`4.531.175 7/1935 Beecher. 11
`361/395
`4,580,192 4/1986 Beun ......
`....... 364/900
`4,593,376 6/1986 Volk ......
`4,596,390 6/1986 Studley
`273/148 B
`4,620,707 11/1986 Lippincott
`273/148 B
`361/415
`4,623,413 12/1986 Speraw .
`4,628,457 12/1986 Manduley .
`.. 364/464
`
`
`
`[551
`
`

`
`U.S. Patent
`
`11
`
`£1
`
`4,945,448
`
`M5
`
`1923.MrluM.F
`
`/...5a7:A
`///Z
`
`0MH1,w,m&H.3....\.H
`3.m.
`
`m.u
`
`an3...7/.Zr//2.
`
`NU MARK Ex.1021 p.2
`
`
`
`

`
`U.S. Patent
`
`Jul. 31, 1990
`
`Sheet 2 of3
`
`4,945,448
`
`44-
`
`4-2
`
`4-5
`
`FIG. 4
`
`
`
`
`
`flllllllllllllliillllllln ’
`/VA \‘\\‘\“‘§'§§§‘\§fi‘CC§C‘§‘
`\
`
`4-0
`
`m’ MIHI
`
`43
`
`NU MARK Ex.1021 p.3
`
`
`

`
`U.S. Patent
`
`Jul. 31, 1990
`
`Sheet 3 of3
`
`4,945,448
`
`I
`
`.\“\
`‘-\\C‘.\‘.\
`“.“““
`“_
`
`FIG. 6
`
`NU MARK Ex.1021 p.4
`
`
`

`
`1
`
`4,945,448
`
`MEMORY CARTRIDGE FOR A CIRCUIT BOARD
`MODULE
`
`BACKGROUND OF THE INVENTION
`1. Field of the Invention.
`The field of the invention is electronic controllers for
`controlling industrial machines and processes, and more
`particularly memory cartridges for circuit board mod-
`ules used in such equipment and controllers.
`2. Description of the Prior Art
`Industrial controllers are typically connected to as-
`sembly line equipment and process control equipment in
`manufacturing facilities and other industrial plants.
`Smaller controllers, including programmable control-
`lers, have typically been built as a set of modules that
`are inserted in a rack somewhat like a set of books
`placed side-by-side in a bookcase. These modules may
`include a main processor (CPU) module, communica-
`tion modules and I/O interface modules.
`I/O interface modules were originally developed as
`an isolation interface between the logic-level signals of
`the industrial controller (e.g. 5-volts DC) and the pow-
`er-level signals (e.g. 120-volts AC) being supplied to the
`devices on the industrial equipment being controlled.
`More recently, these I/O modules have included pe-
`ripheral processors which may perform very sophisti-
`cated control functions with periodic communication
`with the main processor (CPU) module.
`In main processor modules it has been known to
`provide some type of replaceable programmable read-
`only memory (PROM) circuits so that the module can
`be reprogrammed. In some instances such PROM’s
`have been placed on a small circuit board and within a
`small housing.
`Where many different programs of a moderate com-
`plexity are to be stored and executed, it is desirable to
`store and execute them in random access memory
`(RAM). This allows convenience in loading, testing and
`debugging such programs. With cartridges, the pro-
`grams can be developed with off-line development sys-
`tems and later installed in the controller equipment.
`Whereas PROM circuits are non-volatile, RAM cir-
`cuits are volatile—their contents are lost when power is
`turned off. Many products therefore provide battery
`back-up for RAM circuits.
`RAM cartridges have not been widely used, perhaps
`due to the size and complexity required in such a car-
`tridge and the need to provide convenient installation.
`There is a need to provide a RAM cartridge in a
`package that is convenient to install and remove from a
`circuit board module in industrial controller equipment.
`In such a cartridge, there is also a problem of the car-
`tridge housing blocking the escape of heat both from
`the circuits in the cartridge itself and from the circuit
`board module into which the cartridge is installed.
`SUMMARY OF THE INVENTION
`
`This invention relates to a cartridge housing for a
`circuit cartridge that may be inserted through a side
`cover of a main circuit board module and connected to
`a main circuit board beneath the cover. The cartridge
`housing attaches between spaced, opposed mounting
`flanges extending towards one another and generally
`parallel to a main panel of the side cover.
`The cartridge housing includes a pair of clip members
`at opposite ends, the clip members each including a
`groove for receiving and engaging a respective mount-
`
`5
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`25
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`2
`ing flange. At least one and preferably both of the clip
`members are yieldable in the longitudinal direction of
`the cartridge housing. The length of the cartridge is
`inserted through the side cover opening to a certain
`depth, where the yieldable clip members are pressed
`into position to secure the cartridge between the mount-
`ing flanges.
`One object of the invention to provide a RAM mem-
`ory cartridge that is convenient to install and remove
`with one hand on the cartridge and the other hand on
`the main module. The cartridge is snapped into place by
`squeezing the yieldable clip members between a thumb
`on one end and the fingers on the other end. The length
`of the cartridge is preferably in the range of 5 to 6
`inches in length so as to fit the average adult human
`hand.
`Besides its length, the cartridge also provides for
`convenient handling by providing gripping extensions
`on the ends of the clip members.
`The clip members and the mounting flanges are ar-
`ranged to control the depth of insertion of the cartridge,
`so that in the installed position, the outer housing panel
`is flush with the main body of the housing cover.
`The cartridge housing is preferably an assembly of a
`cover and a base, and therefore the housing also pro-
`vides convenient features for locating and attaching
`these two components.
`Another object of the invention is to provide proper
`ventilation of the cartridge and also to allow cooling air
`flow from the underlying main circuit board module.
`The foregoing and other objects and advantages of
`the invention will appear from the following descrip-
`tion. In the description, reference is made to the accom-
`panying drawings which form a part hereof and in
`which there is shown by way of illustration, a preferred
`embodiment of the invention. Such embodiment does
`not necessarily represent the full scope of the invention,
`however, and reference is made therefore to the claims
`herein for interpreting the scope of the invention.
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`FIG. 1 is an exploded perspective view of the RAM
`cartridge and the I/O module showing their orientation
`prior to connection;
`FIG. 2 is an enlarged sectional View along line 2-2
`in FIG. 1 showing the engagement of the flexible posi-
`tioning clips of the cartridge of FIG. 1 with the posi-
`tioning flange of the I/O module of FIG. 1;
`FIG. 3 is an exploded view of the cartridge of FIG. 1;
`FIG. 4- is a sectional view along lines 4--4 of FIG. 3;
`FIG. 5 is a sectional View along lines 5-5 of FIG. 3;
`and
`
`FIG. 6 is a perspective View of the inside end of the
`cartridge frame of the cartridge of FIG. 1 showing air
`circulation paths.
`DETAILED DESCRIPTION OF THE
`PREFERRED EMBODIMENT
`
`FIG. 1 shows an I/O module 12 of the type which is
`inserted in an equipment rack in a programmable con-
`troller system. The I/O module 12 has a main circuit
`board 16 with edge termination areas 18 that are re-
`ceived in an edge connector (not shown) on a rack
`backplane when the I/O module 12 is plugged in for
`operation. A cover 14 is mounted to the circuit board 16
`to enclose its circuitry and to shield it from similarly
`constructed adjacent circuit modules in the rack.
`
`NU MARK Ex.1021 p.5
`
`
`

`
`3
`The cover 14 is formed with a vertically extending,
`rectangular opening 22. The cover 14 is also formed
`with mounting flanges 24 at upper and lower ends of the
`opening 22. These flanges 24 extend inwardly towards
`each other and towards the center of the opening 22 and
`include main portions 24a extending generally parallel
`to a main panel 14a of the cover 14. The flanges 24 also
`include connecting portions 24b that extend inwardly
`towards the circuit board 16 to position the main por-
`tions 24a in a recessed position relative to the main
`panel 140. Seen through the opening is a male electrical
`connector 20 mounted on the circuit board 16 with a
`plurality of pins projecting upward within an insulating
`shell.
`The invention relates to a memory cartridge 10, with
`electrical components mounted on an auxiliary circuit
`board 30 as illustrated in FIG. 3 These components
`include RAM memory circuits 34, which in this em-
`bodiment include three 32K by 8-bit static read-only-
`memories (SRAM). Also mounted on the circuit board
`30 and included in the circuit are some power-up/pow-
`er-down circuitry, a disc-shaped, lithium cell, backup
`battery 32 and a female electrical connector 38.
`The backup battery 32 is electrically connected
`through the circuit board 30 to power the RAM circuits
`34 when the cartridge 10 and RAM circuits 34 are dis-
`connected and removed from the I/O module 12 for
`transportation. This battery power preserves the con-
`tents of the RAM circuits 34, making the memory non-
`volatile.
`The female electrical connector 38 is plugged into the
`male connector 20 on the main circuit board module 12
`to connect the circuitry on the auxiliary circuit board 30
`to circuitry on the main circuit board 16. It should be
`understood that the auxiliary circuit board 30 is thus
`mounted in a position with its circuit side facing in
`toward the circuit side of the main circuit board 16.
`To connect the two circuit boards 16, 30, the memory
`cartridge 10 is inserted into the side opening in the
`cover 14 as seen in FIG. 1 The electrical connector 20
`in FIG. 1 is received through an opening 44 in the car-
`tridge housing illustrated in FIGS. 3 and 4. The opening
`exposes and allows access to its mating connector 38
`which is seen below the opening 44 in FIG. 4.
`The direction of insertion (the direction of the depth
`of the cartridge 10 and the thickness of the module 18)
`will be used as one reference relative to the cartridge 10
`and the module 12. The other two directions shall be
`defined as the direction of extension of the cartridge
`along its length (the longitudinal direction) and the
`direction of extension of the cartridge across its width
`(the transverse direction).
`Referring again to FIG. 3, the memory cartridge 10
`has a housing comprised of two pieces, a base 42 and a
`cover 40. As seen in FIG. 3,
`the housing has been
`flipped over to view the underside of the cover 40 and
`bottom side of the base 42. Each piece 40 and 42 is
`integrally formed of a suitable plastic material using
`injection molding processes. A preferred material is CE
`Valox 347 polyester.
`The cover 40 has a rectangular panel 41 which be-
`comes the top panel of the cartridge housing. Along the
`right side, a sidewall 37 extends from one end of the
`cover 40 to the other. The sidewall 37 has an aperture
`48 for receiving a barb 46 on a sidewall 43 of the base
`42. Referring to FIGS. 3 and 6, at each end of the panel
`41 are three L—shaped ledge members 56, one at each
`corner and one in the middle. These members 56 are
`
`l0
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`
`4,945,448
`
`4
`spaced from each other to provide two vents 58 at each
`end for ventilating the underside of the circuit board 30,
`which is slidably received on the ledge members 56. A
`cross piece 57 extends transversely across the tops of
`the ledge members 56 to support a pair of spaced guide
`blocks 54. The guide blocks 54 are formed with chan-
`nels opening upwardly as seen in FIGS. 3 and 6. A clip
`member 26 extends transversely across the outer sides
`of the guide blocks 54 and is integrally attached to the
`guide blocks 54. As seen in FIG. 2, the clip member 26
`extends upwardly and outwardly through a sloped por-
`tion 27 to a mounting flange detent 29 and then to a
`groove 25 formed by the space between the detent 29
`and horizontal stop flange 31. A second groove 35 sepa-
`rates the stop flange 31 from a gripping flange 33. The
`sloped portion 27, the groove 25, the detent 29 and the
`stop flange 31 all extend transversely across the end of
`the cover 40.
`Referring again to FIG. 3, the base 42 has two side-
`walls 43 extending between its ends which are open. A
`second barb 46 is located on the left sidewall opposite
`the barb 46 on the right sidewall 43. Four additional
`barbs 46 are located at the corners of the sidewalls 43
`which are farthest from a panel 45 that forms the car-
`tridge housing bottom panel. The opening 44 that ex-
`poses the connector 38 is formed along the left sidewall
`towards one end of the panel 45. Openings 49 are
`formed near the four corners of the panel 45 and mid-
`way along the right sidewall 43 for ventilation and for
`access to portions of the cartridge 10 during disassem-
`bly. Spaced inwardly from the ends of the panel 45 are
`two transversely spaced blades 52 which extend per-
`pendicularly from the inner side of the panel 45.
`Before attaching the base 42 to the cover 40, the
`circuit board 30 with its associated circuitry is slidably
`inserted in a slot formed between the ledge members 56
`and the bottoms of the guide blocks 54. A foam pad (not
`shown) is placed on the underside of base 42 and cap-
`tured between the battery 32 and the underside of the
`base 42. The base 42 is formed with an annular ridge
`(not shown) to hold the pad from slipping sideways off
`the top of the battery 32.
`In attaching the base 42 to the cover 40, the base 42 is
`located by inserting the blades 52 in the channels of the
`guide blocks 54. The sidewalls 43 of the base 42 are
`pressed down over the sidewall 37 and comer ledge
`members 56 of the cover 40 with the sidewalls 43 flex-
`ing outward to allow the comer barbs 46 to slide into
`position on ledges 50 formed on the outer sides of the
`ledge members 56 as seen in phantom in FIG. 5. The
`barb 46 on the right sidewall 43 is received in aperture
`48 as seen in FIG. 4 and the barb 46 on the left sidewall
`43 is hooked to the underside of the circuit board 0 also
`seen in FIG. 4. When the cartridge is assembled, the
`connection provided by barb 46 and aperture 48 is hid-
`den beneath panel 41 to secure the cartridge against
`easy disassembly. The assembled cartridge 10 is now
`ready for installation in the I/O module 12.
`Referring to FIGS. 1 and 2, the memory cartridge 10
`is inserted along its length into opening 22 in the inser-
`tion direction. The position of the opening 44 (shown in
`FIG. 3) on the underside of the cartridge 10 assures the
`proper orientation of the upper and lower ends of the
`cartridge 10. The installer places a thumb 28 on the
`gripping flange 33 at one end of the housing and one or
`more fingers on the gripping flange 33 at the other end
`of the housing to squeeze the clip members longitudi-
`nally inward and towards each other to aid insertion. At
`
`NU MARK Ex.1021 p.6
`
`
`

`
`5
`the same time the installer presses the cartridge through
`the opening 22 until the pins of connector 20 are re-
`ceived into sockets in connector 38.
`During insertion, the sloped land portion 27 rides
`along the inner edge of mounting flange 24 helping to
`center the memory cartridge 10 between the mounting
`flanges 24. Longitudinal inward pressure against the
`sloped land 27 bends the clip members 26 toward the
`body of the memory cartridge 10 to assist in the engage-
`ment of flange detent 29. At each end of the rectangular
`opening 22 the edge of each mounting flange 24 is re-
`ceived in the groove 25 formed between the raised
`flange detent 29 and the insertion stop 31. Insertion stop
`31, which has no preceding sloped land, prevents inser-
`tion to a greater depth regardless of possible continued
`pressure in the insertion direction. The upper side of the
`flange detent 29, facing the insertion stop 31 and groove
`25, is also sloped but more abruptly than land 27 so as to
`resist uncoupling forces opposite the insertion direction.
`The gripping flanges 33 are released to permit final
`seating of the edges of the mounting flanges 24 in the
`grooves 25.
`To remove the cartridge 10, gripping flanges 33 may
`again be compressed longitudinally inward by thumb
`and finger pressure with a pulling action opposite the
`insertion direction. This in turn compresses the clip
`members 25 against the body of the memory cartridge
`10, disengaging flange detent 29 and groove 25 from the
`mounting flange 24 so that the memory cartridge 10
`may be removed.
`The offset of mounting flanges 24 beneath the panel
`of the I/O module cover controls the depth of insertion
`of the memory cartridge 10. It also provides for a posi-
`tioning of the cartridge housing top panel flush with the
`I/O module cover. This prevents interference with
`other I/O modules installed in the rack.
`The support of the clip members 26 by the guide
`blocks 54 avoids the need for end walls on the cover 40.
`The lack of obstructing end walls permits air circula-
`tion, shown by arrows 60, through vents 58 at either
`end of the cover 40. The cover 40 is formed of injection
`molded plastic to provide electrical insulation, resil-
`ience, and the flexibility required of the clip members
`26.
`
`This has been a detailed description of a preferred
`embodiment of the invention. The invention can also be
`practiced with certain modifications of a type that are
`understood by those of ordinary skill in the art. For
`example only one of the opposing clips members need
`be flexible; one clip member may be rigidly attached. As
`another example, the RAM circuitry and battery could
`be replaced by other circuitry. Therefore, to apprise the
`public of the scope of embodiments contemplated by
`the invention, the following claims are made.
`We claim:
`1. A housing for a circuit cartridge, of the type in-
`cluding a circuit board carrying electrical circuitry and
`an electrical connector on one side of the circuit board,
`for connection to a main circuit board module having a
`cover with a main panel and with spaced, opposed
`mounting flanges extending towards one another and
`generally parallel to the main panel, wherein:
`the housing extends in a longitudinal direction along
`the plane of the circuit board between two opposite
`ends and extends in the transverse direction per-
`pendicular to the longitudinal direction and paral-
`lel to the plane of the circuit board; and
`
`10
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`20
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`25
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`35
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`50
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`55
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`65
`
`4,945,448
`
`6
`wherein the housing includes a pair of clip members
`at the opposite ends of the housing, the clip mem-
`bers each including means for receiving and seating
`a respective mounting flange transversely extend-
`ing across the ends of the housing, wherein the
`means for receiving and seating are located on the
`clip members to control depth of insertion, at least
`one clip member being yieldable in the longitudinal
`direction to allow insertion of the cartridge along
`its length and through an opening on the main
`circuit board module to the controlled depth of
`insertion, where the mounting flanges are seated in
`the clip member to secure the cartridge therebe-
`tween.
`
`2. A circuit cartridge of claim 1, wherein the clip
`members are spaced a distance between a thumb on one
`end and fingers on the other end of an average adult
`human hand to be gripped thereby.
`3. A cartridge housing for supporting an auxiliary
`circuit board for insertion into a side opening in a cover
`on a main circuit board module and for attachment
`between spaced, opposed mounting flanges on the
`cover extending towards one another and generally
`parallel to a main body of the cover, the cartridge hous-
`ing comprising:
`a base including a bottom cartridge housing panel;
`a cartridge housing cover including a top cartridge
`housing panel, including means for slidably receiv-
`ing and supporting the circuit board, the plane of
`the circuit board extending in the transverse and
`longitudinal directions in a position spaced below
`the top housing panel and spaced above the bottom
`housing panel;
`means for attachment of the cover to the base;
`the cartridge housing cover having clip members at
`opposite ends of the cartridge housing cover, at
`least one of the clip members being flexible to be
`urged inwardly towards the other clip member on
`an opposite end as the cartridge housing cover and
`base are inserted into an opening in the cover of the
`main circuit board module;
`wherein each clip member has edge-receiving means
`disposed transversely across a respective end of the
`cartridge housing cover to receive an edge of a
`respective mounting flange;
`wherein the flexible clip member has means located
`above its respective edge-receiving means for grip-
`ping and urging the flexible clip member towards
`the other clip member on an opposite end during
`insertion of the house cartridge between the
`mounting flanges; and
`wherein said means for gripping is releasable when
`the edge-receiving means are in alignment with the
`mounting flanges to receive the edges of the
`mounting flanges and secure the cartridge housing
`therebetween.
`4. A cartridge housing of claim 3, wherein the clip
`members are each attached to a pair of spaced apart
`guide blocks at a respective end of the cartridge housing
`cover.
`
`5. A cartridge housing of claim 3, wherein the means
`for attachment of the base to the cover comprises:
`the base having upwardly extending sidewalls with
`inwardly extending barbs formed at upper corners
`of the sidewalls;
`the cover having ledge members at the comers of the
`top cartridge housing panel; and
`
`NU MARK Ex.1021 p.7
`
`
`

`
`4,945,448
`
`8
`mounting flanges and secure the cartridge housing
`therebetween.
`8. A cartridge housing of claim 7, wherein the edge-
`receiving means is formed on each end by a stop flange
`and a mounting flange detent which run parallel and
`transversely across each end of the cartridge housing
`cover and are spaced apart
`to define a transverse
`groove therebetween.
`9. A cartridge housing of claim 7, wherein the means
`for attachment of the base to the cover comprises:
`the cover having one downwardly extending side-
`wall with a locking aperture located just below the
`position where the auxiliary circuit board is re-
`ceived; and
`the base having one sidewall extending upwardly
`_ along the sidewall of the cover, the base sidewall
`having a barb projecting therefrom and being flexi-
`ble to allow the barb to slide into the locking aper-
`ture and through the cover sidewall, where it is
`hidden from view by the top cartridge housing
`panel.
`10. A cartridge housing of claim 7, wherein the base
`includes alignment blades extending upwardly from the
`cartridge housing bottom panel, and wherein said guide
`blocks form channels for receiving the alignment blades
`and locating the base relative to the cover during assem-
`bly.
`#
`1
`8
`t
`I
`
`7
`wherein the sidewalls of the base are flexible to allow
`the barbs to slide up and over the ledge members
`on the cover to attach the base to the cover.
`
`6. A cartridge housing of claim 3, wherein the clip
`members are spaced a distance between a thumb on one
`end and fingers on the other end of an average adult
`human hand, said flexible clip member being gripped
`and squeezed toward the another clip member during
`attachment of the cartridge housing to the main circuit
`board module.
`
`7. A cartridge housing for supporting an auxiliary
`circuit board and for insertion into a side opening in a
`the main circuit board module,
`wherein each clip member has edge-receiving means
`disposed transversely across a respective end of the
`cartridge housing cover to receive an edge of a
`respective mounting flange,
`wherein the flexible clip member has means located
`above its respective edge-receiving means for grip-
`ping and urging the flexible clip member towards
`the other clip member on an opposite end during
`insertion of the housing cartridge between the
`mounting flanges, and
`wherein said means for gripping is releasable when
`the edge-receiving means are in alignment with the
`mounting flanges to‘ receive the edges of the
`
`10
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`15
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`20
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`25
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`30
`
`35
`
`45-
`
`50
`
`55
`
`60
`
`65
`
`NU MARK Ex.1021 p.8
`
`
`

`
`UNITED STATES PATENT AND TRADEMARK OFFICE
`CERTIFICATE OF CORRECTION
`: 4,945,448
`
`Page 1 of 2
`
`PATENTNO.
`
`: July 31, 1990
`DATED
`INVENTOMS) : Edwin L. Bremencur, Michael F. Tratar & Gerald S. Pepera
`
`It is certified that error appears in the above~identified patent and that said Letters Patent is hereby
`contacted asshnwn below:
`
`add the following:
`Col. 7, line 12 After the words "opening in a"
`-—ccver on a main circuit board module and for attachment between spaced,
`cpposed mounting flanges on the cover extending towards one another and
`generally parallel to a main body of the cover, the cartridge housing
`ccmprising:
`a base including a bottom cartridge housing panel;
`a cartridge housing cover including a top cartridge housing panel,
`including means for slidably receiving and supporting the circuit board
`in a position spaced below the top housing panel and spaced above the
`bottom housing panel, the means for slidably receiving and supporting
`the circuit board including a plurality of ledge mexrbers at each end of
`the top housing panel, the ledge manbers supporting a bottom side of the
`auxiliary circuit board and being spaced transversely across each end of
`the top housing panel, so as together with the top housing panel, to
`define vents therebetween for ventilating a region along the bottom side
`of the auxiliary circuit board; and
`
`NU MARK Ex.1021 p.9
`
`
`

`
`UNITED STATES PATENT AND TRADEMARK OFFICE
`CERTIFICATE OF CORRECTION
`
`PATENT N0.
`
`DATED
`
`:
`
`:
`
`4,945,448
`
`July 31, 1990
`
`Page 2 of 2
`
`lNVENTOR(S) :
`
`Edwin L. Bremenour, Michael F. Tratar & Gerald S. Pepera
`
`It is certified that error appears in the above-identified patent and that said Letters Patent is hereby
`corrected as shown below:
`
`a plurality of guide blocks spaced transversely across each end
`of the top housing panel and spaced frcm the ledge members,
`flue guide
`blocks having bottcms for containing a top side of the auxiliary circuit
`
`board;
`
`means for attachment of the cover to the base;
`
`the cartridge housing cover having clip manbers at opposite ends
`of the cartridge housing cover, at least one of the clip members being
`
`flexible to be urged inwardly towards the other clip member on an
`
`opposite end as the cartridge housing cover and base are inserted
`
`into an opening in the cover of——.
`
`Signed and Sealed this
`
`Eighteenth Day of February, 1992
`
`Arrest:
`
`HARRY F. MANBECK. JR.
`
`Commissioner of Patents and Trademarks
`Arresting Ofiicer
`
`
`NU MARK Ex.1021 p.10