Modem-telephone interconnect

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4987586
SERIAL NO

07080404

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ATTORNEY / AGENT: (SPONSORED)

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, TX13415

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gross, Allen E Carrollton, TX 2 70
Malm, Marvin F Dallas, TX 2 39

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (2)
* 4809317 Telephone line exclusion device 18 1987
* 4807278 Telecommunication controller having a telephone line sharing function 14 1987
 
Prentice Corporation (1)
* 4596021 Modem for switching between voice and data communications on a single telephone call 121 1984
 
DOWTY COMMUNICATIONS, INC., A CORP. OF DE (1)
* 4355397 Full duplex communication system for voice grade channels 22 1980
 
CROWDER, JACK SR. (1)
* 4546212 Data/voice adapter for telephone network 163 1984
 
TIMEX CORPORATION (1)
* 4394540 Remote meter reader and method for reading meters over non-dedicated telephone lines 53 1981
 
SAMSUNG ELECTRONICS CO., LTD. (1)
* 4571456 Portable computer 133 1982
 
HASHIMOTO CORPORATION (1)
* 4660218 Apparatus for switching telephone line a response device, a data terminal or a telephone 107 1985
 
CSELT-CENTRO STUDI E LABORATORI TELECOMUNICAZIONI S.P.A. (1)
* 4463351 System for providing several data terminals with access to a digital telephone line 19 1982
 
CYGNET TECHNOLOGIES, INC., (2)
* 4524244 Digital and voice telecommunication apparatus 114 1983
* 4578537 Telecommunication apparatus serving as an interface between a digital computer and an analog communication medium 162 1983
 
Portable Terminal Corp. (1)
* 4496943 Portable information display 56 1982
 
General Telephone Inc. (1)
* 4585904 Programmable computerized telephone call cost metering device 147 1984
 
PCTEL, INC. (1)
* 4471489 Automatic answer/originate mode selection in modem 21 1981
 
Kinex Corporation (1)
* 4514825 High speed digital modem 13 1982
 
SOCIETE ELECTRONIQUE DU NORD-EST PARISIEN SEINEP, 16 RUE ROYALE, 60138 CHIRY OURSCAMPS, FRANCE A CORP. (1)
* 4580266 Method of radio telecommunication and device for implementation thereof 3 1983
 
CLARION CO., LTD. (1)
* 4350848 Data transmission system 6 1980
 
Novation, Inc. (1)
* 4367374 Modem telephone interface circuit 45 1981
 
INFORMATION MACHINES CORPORATION, A CA CORP. (1)
* 4503288 Intelligent telephone 195 1981
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
* 5239580 Modem-telephone coupler 19 1991
 
Other [Check patent profile for assignment information] (1)
* 5325428 Automatic switching-back device for telephone circuit 0 1991
 
VERIZON PATENT AND LICENSING INC. (1)
* 7349536 Techniques for providing uninterrupted digital communications to customers coupled to local loop generation equipment 2 1999
 
TRONTECH LICENSING INCORPORATED (1)
* 6160872 Apparatus and method for preventing disconnection of consumer premises equipment 7 1998
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (3)
* 5127046 Push/pull modem interface circuit 8 1990
8223958 Determining an active line 0 2005
* 2007/0116,252 Determining an active line 0 2005
 
SMARTLINK LTD. (3)
7151794 Modem channel sharing based on frequency division 2 2002
* 2004/0032,871 Switch-based modem channel sharing 3 2002
* 2004/0032,902 Modem channel sharing based on frequency division 3 2002
 
PENTAX RICOH IMAGING COMPANY, LTD. (1)
* 5606716 Device for detecting the connectivity of a monitor and inhibiting a data reproducing operation 2 1992
 
SAGEM SA (1)
* 5504807 Telephone apparatus with a continuously-connected DC-isolated modem 4 1993
 
Multi-Tech Systems, Inc. (2)
6570891 Advanced priority statistical multiplexer 21 2000
6515984 Data/voice/fax compression multiplexer 8 2000
 
SAMSUNG ELECTRONICS CO., LTD. (1)
* 5978453 Method and apparatus for switching to a modem in a key telephone 0 1997
 
GLOBAL TECHNOLOGY INC. (9)
* 5844979 Intelligent switching system for voice and data 79 1995
* 6061440 Intelligent switching system for voice and data 97 1998
6373936 Intelligent switching system for voice and data 30 2000
6819752 Intelligent switching system for voice and data 26 2001
7391856 Intelligent switching system for voice and data 3 2006
* 2007/0126,855 Intelligent Switching System for Voice and Data 0 2006
8068592 Intelligent switching system for voice and data 1 2009
* 2009/0175,427 INTELLIGENT SWITCHING SYSTEM FOR VOICE AND DATA 3 2009
8755508 Intelligent switching system for voice and data 0 2011
 
MURATA KIKAI KABUSHIKI KAISHA (1)
* 6023346 Communication terminal device 2 1997
 
Intertex Data AB (2)
* 5140631 Apparatus and method for determining the state of a telephone line 41 1990
* 5291545 Apparatus and method for determining the state of a telephone line 20 1992
 
RANIERE, KEITH (3)
7215752 Intelligent switching system for voice and data 6 2004
* 2004/0210,635 Intelligent switching system for voice and data 0 2004
7844041 Intelligent switching system for voice and data 1 2008
 
INTEL CORPORATION (2)
6351533 System and method for protecting devices connected to a telephone line 13 1998
6618482 System and method for protecting devices connected to a telephone line 4 2001
 
RPX CORPORATION (1)
* 5848150 Passive distributed filter system and method 140 1997
 
SMART LINK LTD. (1)
* 2003/0223,557 Method and apparatus for handset exclusion control 0 2002
 
OKI DATA CORPORATION (1)
* 5812646 Switching controller with supervisory mode for communication terminals 5 1996
 
TELLABS OPERATIONS, INC. (1)
* 5550901 Full-duplex adapter for PBX telephone system 9 1994
 
Shirohato Yakuhin Co., Ltd. (1)
* 5206898 Transmission control unit 9 1991
 
AASTRA TECHNOLOGIES, INC. (1)
* 6061438 Extension-in-use exclusion apparatus 9 1994
* Cited By Examiner