US Patent No: 4,987,586

Number of patents in Portfolio can not be more than 2000

Modem-telephone interconnect

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Importance

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Abstract

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A modem/telephone interconnect for sharing a telephone line or communication channel between a modem and a telephone or other communication device. The interconnect provides access to the telephone line by both devices but normally prevents each device from interrupting or interfering with the operation of the other. The telephone can be used to monitor data transfer by the modem without the possibility of interfering with the data signals or quiet times.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.HOUSTON, TX27481

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gross, Allen E Carrollton, TX 2 65
Malm, Marvin F Dallas, TX 2 39

Cited Art Landscape

Patent Info (Count) # Cites Year
 
CYGNET TECHNOLOGIES, INC., (2)
4,524,244 Digital and voice telecommunication apparatus 110 1983
4,578,537 Telecommunication apparatus serving as an interface between a digital computer and an analog communication medium 149 1983
 
TELTONE CORPORATION (2)
4,330,687 Audio and full duplex digital data carrier system 40 1979
4,302,629 Digital data transmission system 73 1979
 
CLARION CO., LTD. (1)
4,350,848 Data transmission system 6 1980
 
CROWDER, JACK SR. (1)
4,546,212 Data/voice adapter for telephone network 146 1984
 
CSELT - CENTRO STUDI E LABORATORI TELECOMUNICAZIONI S.P.A. (1)
4,463,351 System for providing several data terminals with access to a digital telephone line 19 1982
 
Data General Corporation (1)
4,425,625 Diagnostic display terminal system 26 1979
 
DOWTY COMMUNICATIONS, INC., A CORP. OF DE (1)
4,355,397 Full duplex communication system for voice grade channels 22 1980
 
General Telephone Inc. (1)
4,585,904 Programmable computerized telephone call cost metering device 142 1984
 
HASHIMOTO CORPORATION (1)
4,660,218 Apparatus for switching telephone line a response device, a data terminal or a telephone 107 1985
 
INFINET, INC., (1)
4,306,116 Communications unit for voice and data 46 1979
 
INFORMATION MACHINES CORPORATION, A CA CORP. (1)
4,503,288 Intelligent telephone 187 1981
 
Kinex Corporation (1)
4,514,825 High speed digital modem 12 1982
 
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (1)
4,321,429 Apparatus for selecting terminal equipment in telephone lines 17 1979
 
Novation, Inc. (1)
4,367,374 Modem telephone interface circuit 45 1981
 
PCTEL, INC. (1)
4,471,489 Automatic answer/originate mode selection in modem 21 1981
 
Portable Terminal Corp. (1)
4,496,943 Portable information display 52 1982
 
Prentice Corporation (1)
4,596,021 Modem for switching between voice and data communications on a single telephone call 110 1984
 
SAMSUNG ELECTRONICS CO., LTD. (1)
4,571,456 Portable computer 128 1982
 
SOCIETE ELECTRONIQUE DU NORD-EST PARISIEN SEINEP, 16 RUE ROYALE, 60138 CHIRY OURSCAMPS, FRANCE A CORP. (1)
4,580,266 Method of radio telecommunication and device for implementation thereof 3 1983
 
Timex Corporation (1)
4,394,540 Remote meter reader and method for reading meters over non-dedicated telephone lines 53 1981
 
Other [Check patent profile for assignment information] (2)
4,809,317 Telephone line exclusion device 18 1987
4,807,278 Telecommunication controller having a telephone line sharing function 14 1987

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
GLOBAL TECHNOLOGIES, INC. (GTI) (8)
5,844,979 Intelligent switching system for voice and data 74 1995
6,061,440 Intelligent switching system for voice and data 87 1998
6,373,936 Intelligent switching system for voice and data 27 2000
7,215,752 Intelligent switching system for voice and data 6 2004
7,391,856 Intelligent switching system for voice and data 3 2006
7,844,041 Intelligent switching system for voice and data 1 2008
8,068,592 Intelligent switching system for voice and data 1 2009
8,755,508 Intelligent switching system for voice and data 0 2011
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (2)
5,127,046 Push/pull modem interface circuit 8 1990
8,223,958 Determining an active line 0 2005
 
INTEL CORPORATION (2)
6,351,533 System and method for protecting devices connected to a telephone line 13 1998
6,618,482 System and method for protecting devices connected to a telephone line 4 2001
 
Intertex Data AB (2)
5,140,631 Apparatus and method for determining the state of a telephone line 41 1990
5,291,545 Apparatus and method for determining the state of a telephone line 20 1992
 
Multi-Tech Systems, Inc. (2)
6,570,891 Advanced priority statistical multiplexer 13 2000
6,515,984 Data/voice/fax compression multiplexer 8 2000
 
AASTRA TECHNOLOGIES, INC. (1)
6,061,438 Extension-in-use exclusion apparatus 8 1994
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
5,239,580 Modem-telephone coupler 18 1991
 
MURATA KIKAI KABUSHIKI KAISHA (1)
6,023,346 Communication terminal device 2 1997
 
OKI DATA CORPORATION (1)
5,812,646 Switching controller with supervisory mode for communication terminals 5 1996
 
PENTAX RICOH IMAGING COMPANY, LTD. (1)
5,606,716 Device for detecting the connectivity of a monitor and inhibiting a data reproducing operation 2 1992
 
SAGEM SA (1)
5,504,807 Telephone apparatus with a continuously-connected DC-isolated modem 4 1993
 
SAMSUNG ELECTRONICS CO., LTD. (1)
5,978,453 Method and apparatus for switching to a modem in a key telephone 0 1997
 
Shirohato Yakuhin Co., Ltd. (1)
5,206,898 Transmission control unit 9 1991
 
SMARTLINK LTD. (1)
7,151,794 Modem channel sharing based on frequency division 2 2002
 
SPECTRABAND COMMUNICATIONS, LLC (1)
5,848,150 Passive distributed filter system and method 118 1997
 
TELLABS OPERATIONS, INC. (1)
5,550,901 Full-duplex adapter for PBX telephone system 9 1994
 
TRONTECH LICENSING INCORPORATED (1)
6,160,872 Apparatus and method for preventing disconnection of consumer premises equipment 5 1998
 
VERIZON PATENT AND LICENSING INC. (1)
7,349,536 Techniques for providing uninterrupted digital communications to customers coupled to local loop generation equipment 2 1999
 
Other [Check patent profile for assignment information] (2)
5,325,428 Automatic switching-back device for telephone circuit 0 1991
6,819,752 Intelligent switching system for voice and data 22 2001