United States Patent 1191
`Drori et al.
`
`[54] SYSTEM FOR INTEGRATING A CELLULAR
`TELEPHONE WITH A VEHICLE SECURITY
`SYSTEM
`[75] Inventors: Ze’ev Drori, Los Angeles; Robert M.
`Woskow, Encino, both of Calif.
`Clifford Electronics, Inc.,
`Chatsworth, Calif.
`[21] Appl. No.: 497,107
`[22] Filed;
`Mar. 20, 1990
`
`[73] Assignee:
`
`[63]
`
`Related US. Application Data
`Continuation-impart of Ser. No. 345,654, May 1, 1989,
`abandoned.
`
`[51] 1111.01.5 .......................................... .. 1104M 11/00
`[52] US. (:1. ....................... ..
`.. 379/59; 379/44;
`340/426; 340/539; 340/993; 290/33 c
`[58] Field of Search ......... .. 290/33 c; 340/441, 4255,
`340/425, 531, 539, 325.31, 993; 379/57-60, 63,
`39, 41, 44; 455/33, 54
`References Cited
`U.S. PATENT DOCUMENTS
`
`[56]
`
`Re. 32,856 2/1989 Millsap .............................. .. 340/539
`2,698,391 12/1954 Braden et a]. .
`2,748,759 6/1956 Schiffer .
`. 2,836,732 5/1958 Newlin .
`2,975,296 4/ 1961 Dominguez .
`3,078,834 2/1963 Wright .
`3,357,417 l2/l967 Baumann .
`3,455,403 7/1969 Hawthorne .
`3,530,846 9/1970 Bean et a1. .
`3,538,898 11/1970 Edgemir .
`3,633,040 1/1972 Baxter .
`3,657,720 4/1972 Audenko et a1. ............... .1 290/38 C
`3,696,333 10/1972 Mott .
`3,718,899 4/1971 Rollins .............................. .1 340/993
`3,859,540 1/1975 Weiner .
`4,177,466 12/ 1979 Reagan ................................ .. 340/63
`4,200,080 5/1980 Cook et al. .
`4,236,594 12/1980 Ramsperger .
`4,345,554 8/1982 Hildreth et al. .
`4,392,059 7/ 1983 Nespor .
`4,606,307 8/ 1986 Cook .
`4,674,454 6/1987 Phairr .
`4,688,244 8/1987 Hannon et a1. ..................... .. 379/44
`
`lllllllllllll?llllllllllllli
`US005081667A
`[11] Patent Number:
`5,081,667
`Jan. 14, 1992
`[45] Date of Patent:
`
`4,718,080 1/1988 Serrano et al. ..................... .. 379/59
`4,736,461 4/1988 Kawasaki et a1. ..
`
`
`
`
`
`4,750,197 6/1988 Dewekamp et al. 4,754,255 6/1988 Sanders et a1. 4,794,649 12/ 1988 Fujiwara ....... ..
`
`
`
`
`
`4,809,316 2/1989 Namekawa 4,821,309 4/1989 Namekawa 4,860,336 8/1989 D’Avello et a1. ..
`
`4,887,064 12/ 1989 Drori et a1. . . . . .
`4,893,240 l/ 1990 Karkouti
`
`. . . .. 340/426
`290/38 C
`
`4,904,983 2/1990 Mitchell . . . . . .
`
`. . . . . .. 379/41
`
`379/ 58
`4,905,271 2/ 1990 Namekawa
`4,910,493 3/ 1990 Chambers et al. ................ .. 340/426
`4,928,778 5/1990 Tin .
`
`FOREIGN PATENT DOCUMENTS
`
`0128861 8/1986 Japan .
`
`OTHER PUBLICATIONS
`Motorola publication, “DYNAT-A-C 600071 Universal
`Mobile Telephone”, 1984, pp. 1-6.
`.
`“AB3X Cellular Interface-Owner’s Manual,” Morrison
`& Dempsey Communications Inc, 1987.
`Primary Examiner-James L. Dwyer
`Assistant Examiner-Dwayne D. Bost
`Attorney, Agent, or Firm—-Roberts and Quiogue
`[57]
`ABSTRACT
`An interfacing system for integrating a wide variety of
`cellular communication systems with most vehicle secu
`rity systems. The system includes a controller and an
`interfacing arrangement for matching the cellular tele
`phone to the controller. The interfacing arrangement.
`includes a library, stored in memory, having a plurality
`of unique translation tables corresponding to the proto~
`cols of a plurality of unique cellular communication
`systems. The interfacing arrangement further includes
`an initializing capability for selecting an operating pro
`tocol for the interfacing system from the library which
`is compatible with the protocol of the cellular commu
`nication system. 'Hardware and software are included
`for interfacing the vehicle security to the controller and
`for interfacing the controller to the vehicle. In a specific
`embodiment, the selection of cellular telephone type or
`make is made from the keypad of the cellular telephone.
`
`92 Claims, 46 Drawing Sheets
`
`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 1
`
`

`
`US. Patent
`
`' Jan. 14,1992
`
`Sheet 1 of46
`
`5,081,667
`
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`
`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 2
`
`

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`US. Patent
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`
`Jan. 14, 1992
`
`Sheet 2 of 46
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`5,081,667
`
`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 3
`
`

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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 4
`
`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 4
`
`

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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 5
`
`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 5
`
`

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`US. Patent
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`

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`U.S. Patent
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`' Jan. 14,.1992
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 7
`
`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 7
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`

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`U.S. Patent
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 8
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 8
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 9
`
`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 9
`
`

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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 10
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 10
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`

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`U.S. Patent
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 11
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 11
`
`

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`US. Patent
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 12
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 13
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`

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`U.S. Patent
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 14
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 14
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 15
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 15
`
`

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`U.S. Patent
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 16
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`

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`US. Patent
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 17
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`

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`US. Patent
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 18
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`

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`US. Patent
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 19
`
`

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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 20
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 20
`
`

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`U.S. Patent
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`Jan. 14, 1992
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 21
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 21
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`

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`U.S. Patent
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 22
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 22
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`

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`U.S. Patent
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`Jan. 14, 1992
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 23
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 23
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`

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`U.S. Patent
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 24
`
`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 24
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`

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`U.S. Patent
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 25
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`U.S. Patent
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 26
`
`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 26
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`

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`U.S. Patent
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`‘
`
`Jan. 14,1992
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 27
`
`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 27
`
`

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`U.S. Patent
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 28
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 28
`
`

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`U.S. Patent
`
`‘
`
`Jan. 14, 1992
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 29
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 29
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`U.S. Patent
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`Jan. 14, 1992
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`Sheet 29 of 46
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 30
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 30
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`U.S. Patent
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`Jan. 14, 1992
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`Sheet 30 of 46
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 31
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 31
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`U.S. Patent
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`' Jan. 14, 1992
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`Sheet 31 of 46
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 32
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 32
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`U.S. Patent
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 33
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 33
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`

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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 34
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 34
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`

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`U.S. Patent
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 35
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 35
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`U.S. Patent
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 36
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 36
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`U.S. Patent
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`' Jan. 14,1992
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 37
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 37
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`U.S. Patent
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`- Jan. 14, 1992
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`Sheet 37 of 46
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 38
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 38
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`U.S. Patent
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`' Jan. 14, 1992
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`Sheet 38 of 46
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 39
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 39
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`U.S. Patent
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 40
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 40
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`U.S. Patent
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`' Jan. 14, 1992
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 41
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 41
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`

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`U.S. Patent
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`* Jan. 14, 1992
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 42
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 42
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`U.S. Patent
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`' Jan.14, 1992
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`Sheet 42 of 46
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 43
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 43
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`

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`U.S. Patent
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`‘ Jan. 14, 1992
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`Sheet 43 of 46
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 44
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 44
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`U.S. Patent
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`» Jan. 14,1992
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`Sheet 44 of 45
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 45
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 45
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`U.S. Patent
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`' Jan. 14,1992
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 46
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 46
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`

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`U.S. Patent
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`' Jan. 14, 1992
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`Sheet 45 of 46
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`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 47
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`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 47
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`

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`1
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`SYSTEM FOR INTEGRATING A CELLULAR
`TELEPHONE WITH A VEHICLE SECURITY
`SYSTEM
`
`This is a continuation-in-part of application Ser. No.
`07/345,654, filed 5-1-89, (Abandoned) entitled “System
`for Integrating a Cellular Telephone With a Vehicle
`Security System”.
`BACKGROUND OF THE INVENTION
`
`The present invention relates to cellular telephone
`systems, automobile security systems and associated
`apparatus.
`~
`Cellular telephone usage has grown rapidly in recent
`years out of a recognition of the value of ambulatory
`voice and data communication capabilities. There has
`been an associated growth in products and services
`related to the cellular telephone. Many manufacturers
`have introduced and continue the introduction of a
`myriad of cellular telephones with varied features, func-
`tions and protocols. Presently, with an appropriate in-
`terface, a cellular telephone may be interconnected to a
`facsimile machine, an answering machine, or an autodi-
`aler to name a few. While the capability of the typical
`cellular telephone system has grown, cellular tele-
`phones have not heretofore been adequately adapted to
`enhance the security of the host vehicle. This task has
`remained almost exclusively in the province of vehicle
`security systems.
`Vehicle security systems have been available for a
`longer period of time relative to cellular telephones.
`Nonetheless, vehicle security systems have also grown
`in capability and sophistication in recent years. For
`example, systems currently on the market provide for
`remote arming and disarming of the alarm, locking and
`unlocking of the vehicle’s doors, controlling the win-
`dows, or opening the trunk. An exemplary security
`system is described in U.S. Pat. No. 4,887,064. How-
`ever, the remote capability of a typical conventional
`security system is limited. These remote controls have a
`typical operating range of less than one hundred yards
`since they generally rely on a radio or infrared link of
`very limited range. Further, these systems generally
`provided simple on, off, or status indications, yet there
`are many situations that require a broader, more versa-
`tile, and more powerful communication link.
`U.S. Pat. Nos. Re 32,856, reissued Feb. 7, 1989, to
`Millsap et al.; 4,809,316 issued Feb. 28, 1989,
`to
`Namekawa; and 4,821,309,
`issued Apr. 11, 1989,
`to
`Namekawa show systems integrating cellular telephone
`systems with alarm systems. Millsap’s system is adapted
`to provide an alarm system for protected premises at a
`fixed location and is therefore not applicable to vehicle
`protection. The Namekawa systems require the use of a
`proprietary cellular telephone system and therefore do
`not allow for use with cellular telephones manufactured
`by others. Thus, none of the large variety of cellular
`telephone systems already installed in vehicles will
`readily accept the system described in U.S. Pat. Nos.
`4,809,316 and 4,821,309.
`Thus, there is a need in the art for a versatile cellular
`security system which is compatible with a wide variety
`of cellular telephones.
`SUMMARY OF THE INVENTION
`
`The need in the art is addressed by the present inven-
`tion which provides a system that interfaces between a
`
`2
`variety of vehicle security systems and most cellular
`communication systems whether already sold and in-
`stalled in vehicles or yet to be marketed. The system
`includes a system controller and an interfacing arrange-
`ment. The interfacing arrangement includes a first li-
`brary, stored in memory, having a plurality of unique
`translation tables corresponding to the protocols of a
`plurality of unique cellular communication systems.
`The interfacing arrangement further includes an initial-
`izing capability for selecting an operating protocol for
`the interfacing system from the first
`library means
`which is compatible with the protocol of the cellular
`communication system. The library may be updated by
`adding to it the protocol of new cellular communication
`systems as they become available. Hardware and soft-
`ware are included for interfacing the vehicle security
`system to the controller and for interfacing the control-
`ler to the vehicle. In a specific embodiment, the selec-
`tion of the desired cellular ‘telephone type or make is
`made from the keypad of the cellular telephone by
`spelling the telephone type in English via the telephone
`keypad’s buttons.
`Other features of the system include an ability to
`expand and "update the system’s library with a protocol
`of new types and models of cellular phones. The system
`further includes means for starting the vehicle engine
`and verifying the engine’s status from any direct dial
`telephone anywhere in the world. Another feature ena-
`bles the vehicle’s owner to telephone the vehicle once it
`has been discovered that the vehicle has been stolen and
`
`stop the engine. If the vehicle is being driven while the
`command to stop the engine is received, the command
`will be registered. However, the execution of the com-
`mand will take place only when the engine’s RPM or
`vehicle speed are below a preset level, at which point
`the engine will be disabled and the lights will flash. The
`system further includes means to electronically lock the
`telephone keypad preventing an intruder from inter-
`rupting or terminating ‘any incoming or outgoing com-
`mand or calls.
`'
`Another feature allows the owner to listen in or have
`a two-way voice communication with an intruder, even
`though the telephone’s handset is resting in its cradle.
`Another feature of the system enables the vehicle’s
`owner to call the system from any direct dial telephone
`in the world and program into the system either a pager
`number or a telephone number at which the owner can
`be reached and notified in case of intrusion into the
`vehicle.
`Another feature of the invention activates a naviga-
`tion system when the alarm is triggered and repeatedly
`transmits at certain time intervals over the communica-
`tion system the coordinates identifying the vehicle loca-
`tion.
`Another feature of the invention provides synthe-
`sized voice guiding and prompting for the operation
`and control of the system. Another feature of the inven-
`tion provides for programming through the cellular
`telephone keypad such features as entry delay, valet
`mode enabling, horn sounding and sound loudness con-
`trol. These and other features and advantages will be-
`come more apparent from the following description and
`claims.
`
`65
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`These and other features and advantages of the pres-
`ent invention will become more apparent from the fol-
`lowing detailed description of an exemplary embodi-
`
`Petitioner Nissan North America, Inc. — Exhibit 1008 — Page 48
`
`Petitioner Nissan North America, Inc. - Exhibit 1008 - Page 48
`
`

`
`3
`ment thereof, as illustrated in the accompanying draw-
`ings, in which:
`FIG. 1 is a simplified block diagram of the system for
`integrating a communication system with a security
`system of the present invention.
`FIG. 2(a) is a top level flow diagram of the fore-
`ground routines of the program of the present inven-
`tion.
`
`FIG. 2(b) is a top level flow diagram of the back-
`ground routines of the program of the present inven-
`tion.
`
`10
`
`FIG. 3(a) is a flow diagram of the Initialization rou-
`tine of the program of the present invention.
`FIG. 3(b) is a flow diagram of the Telephone Set-Up
`subroutine called by the Initialization routine of the
`program of the present invention.
`FIG. 4(a) and 4(b) are flow diagrams of the State
`Control Module of the program of the present inven-
`tion.
`
`FIG. 4(c) through 401) are flow diagrams of the sub-
`routines called by the State Control Module of the
`program of the present invention.
`FIG. 5 is a flow diagram of the Idle foreground rou-
`tine of the program of the present invention.
`FIGS. 6(a) and 6(b) are flow diagrams of the Receive
`foreground routine of the program of the present inven-
`tion.
`'
`
`FIG. 7 is a flow diagram of the Arm foreground
`routine of the program of the present invention.
`FIGS. 8(a) through 8(e) are flow diagrams of the
`Outgoing foreground routines of the program of the
`present invention.
`'
`FIGS. 9(a) through 9(1) are flow diagrams of the
`Program foreground routines of the program of the
`present invention.
`FIGS. 10(0) and l0(b) are flow diagrams of the Peri-
`odic Timer background routine of the program of the
`present invention.
`FIGS. 10(c) through l0(m) are flow diagrams of the
`subroutines called by the Periodic Timer background
`routine of the program of the present invention.
`FIG. l0(n) is a flow diagram of the tracking back-
`ground routine of the program of the present invention.
`FIG. 11 is a flow diagram of the Serial Telephone
`Receiver Buffer background routine of the program of
`the present invention.
`FIG. 12 is a flow diagram of the Tachometer back-
`ground routine of the program of the present invention.
`DETAILED DESCRIPTION OF THE
`PREFERRED EMBODIMENT
`
`Illustrative embodiments and exemplary applications
`will now be described with reference to the accompa-
`nying drawings to disclose the advantageous teachings
`of the present invention.
`Hardware
`
`FIG. 1 is a simplified block diagram of the system for
`integrating a communication system with a security
`system of the present invention. In the preferred em-
`bodiment, the system 10 is adapted for use with a cellu-
`lar telephone system 12. The system 10 is interposed
`between the handset unit 14 and the transceiver 16 of
`the cellular telephone system 12. That is, the cable 18,
`which would ordinarily connect the handset 14 to the
`transceiver 12, is connected to a cable breakout or ter-
`minating strip 19. Cable breakout 19 includes relays and
`other switching elements for providing digital and
`
`15
`
`20
`
`25
`
`30
`
`35
`
`45
`
`50
`
`55
`
`65
`
`5,081,667
`
`4
`audio interfacing. A second cable 22 is connected be-
`tween the cable breakout 19 and the transceiver 16. The
`cables 18 and 22 are terminated at the cellular ends with
`connectors to fit various cellular telephone types. The
`transceiver 16 is connected to a conventional cellular
`telephone antenna 24. The cellular telephone communi-
`cation link passes through the system 10 unimpeded
`while the system 10 is idle. When the system 10 is ac-
`tive, it utilizes audio and digital signals from the cellular
`system 12 and generates audio and digital signals
`thereto.
`The system 10 includes a controller 20 which, in the
`preferred embodiment,
`is implemented with a micro-
`processor. As discussed below, the cable breakout 19
`provides interconnection of the cellular telephone sys-
`tem 12 to the controller 20 via plural interface units
`including a dual tone multiple frequency (DTMF) de-
`coder 26, a call-in-progress interface 28, an external
`telephone interface 30, and an external speech interface
`32. The DTMF decoder 26 is connected to the cable
`breakout 19. The DTMF decoder 26 is a commercially
`available device, such as a type CD22204 IC chip,
`which decodes touch tones from the cellular system 12.
`The call-in-progress interface 28 detects ringing, busy
`signals, etc. The call-in-progress interface 28 is also a‘
`commercially available device, such as a type NE5900
`IC chip. The external telephone interface unit 30 listens
`for audio in both directions, detects the telephone on/-
`off status, and provides access thereto for the controller
`20. The unit 30 also performs the functions of signal
`level conversion, buffering and filtering. The external
`telephone interface unit 30 also provides access for
`sending digital commands from the system 10 to the
`cellular transceivers so that the system 10 may com-
`mand operation of the telephone. An external speech
`interface 32 cooperates with a speech synthesizer 34 to
`provide audio from the synthesizer on command after
`receiving digital output from the controller 20. The
`external speech interface 32 also outputs to an external
`speaker (not shown). The external telephone and speech
`interfaces 30 and 32, respectively, and the speech syn-
`thesizer 34 are constructed using commercially avail-
`able devices.
`
`Inputs from a conventional vehicle security system
`13, from a host vehicle (not shown), and from a global
`positioning tracker (not shown) are received by the
`system controller 20 via level conversion and filtering
`circuits 36. As may be necessary for a particular input,
`the level conversion and filtering circuits 36 filter, con-
`vert from analog-to-digital, and adjust the level of the
`signals received from the vehicle and its security system
`in a manner well known to those of ordinary skill in the
`art. Thus, from the vehicle, the system controller 20 of
`the illustrative embodiment of FIG. 1 receives:
`1)
`TACH signal which indicates the rate of revolution of
`the engine or speed of the vehicle; 2) an IGNITION
`input which depends on the state of the vehicle ignition
`switch or accessories switches; 3) a DOOR TRIGGER
`input from the door switch which indicates whether it is
`open or closed; and 4) a HORN signal which represents
`the state of the horn relay of the vehicle. Likewise, from
`the security system, if any, the system controller 20
`receives ARM, SIREN and LED (light emitting diode)
`signals. Additionally, an input system 10 kill override
`exists so that a separate auto accessory designed by