US Patent No: 4,568,800

Number of patents in Portfolio can not be more than 2000

Multi-channel access (MCA) radio telephone system

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ATTORNEY / AGENT: (SPONSORED)
 

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Abstract

A multi-channel access (MCA) radio telephone system completes calls from conventional telephone systems over a plurality of shared radio channels to a base station serving a plurality of substations connected to a second telephone set. The MCA radio telephone system provides a method for clearing calls after they are completed. The method comprising the steps of: (a) detecting the hang-up at the first and conventional set involved in the clearing call; (b) maintaining the D.C. loop of the subscriber line to the first and conventional telephone set in response to the detection of an on-hook signal and returning the radio channel to an idle and waiting state; (c) detecting the hang-up of the second telephone set which is served by the base station re-establishing a radio channel between the base station and the substation involved in the call being cleared; (d) sending a release signal from the clearing substation through the re-established radio channel to the base station; and (e) opening the D.C. loop to the first and conventional telephone set in response to the release signal and placing the re-established radio channel into an idle and waiting state.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
NEC CORPORATIONTOKYO17429

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Orikasa, Hiromi Tokyo, JP 3 57

Cited Art

Patent Info (Count) # Cites Year
 
GENERAL ELECTRIC COMPANY (1)
4,281,413 Multichannel radio telephone system 21 1979
 
MOTOROLA, INC. (1)
4,400,585 Method and apparatus for automatically attempting to seize a radio channel in a multichannel communication system 53 1981

Patent Citation Ranking

Forward Cites

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INTEL CORPORATION (7)
6,526,026 Digit transmission over wireless communication link 50 1997
6,097,817 Encryption and decryption in communication system with wireless trunk 45 1997
6,751,205 Signaling and protocol for communication system with wireless trunk 12 2001
7,322,041 Authentication and security in wireless communication system 10 2002
7,359,364 Monitoring in communication system with wireless trunk 5 2002
7,079,500 Digit transmission over wireless communication link 4 2003
7,774,278 Wireless access unit with trunk interface 0 2004
 
ROBINSON, ERIC J. (6)
5,127,041 System and method for interfacing computers to diverse telephone networks 216 1990
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5,367,563 Programmable universal modem system and method for using the same 117 1993
5,353,334 Interface for connecting computers to radio telephone networks 120 1994
5,640,444 Methods and apparatus for controlling data transmission using radio devices 71 1994
RE37141 Cellular telephone data communication system and method 23 1995
 
NEC CORPORATION (4)
4,656,653 Cordless telephone apparatus having means for synchronizing channel scanning of fixed and portable units 31 1986
4,860,337 Rapid processing of immediately successive arrival signals in a base station of a radio communication network 12 1988
5,400,391 Mobile communication system 39 1994
5,802,472 Reconnection apparatus in direct communication system between subsidiary radiotelephone units 5 1996
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (2)
5,428,671 Modem for tight coupling between a computer and a cellular telephone 51 1992
5,408,520 Modem for tight coupling between a computer and a cellular telephone 54 1993
 
SITI-SITES.COM, INC. (A CORPORATION OF DELAWARE) (2)
6,295,460 Modem for selectively connecting to a land line or to a cellular telephone 19 1993
RE38645 Portable hybrid communication system and methods 2 2002
 
XIRCOM WIRELESS, INC. (2)
8,165,028 Monitoring in communication system with wireless trunk 2 1997
6,580,906 Authentication and security in wireless communication system 33 1997
 
BASE 10 SYSTEMS, INC. (1)
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HONDA GIKEN KOGYO KABUSHIKI KAISHA (1)
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JAPAN RAIDO CO., LTD. (1)
5,913,176 System for virtual connection to dedicated PSTN lines 41 1997
 
KABUSHIKI KAISHA TOSHIBA (1)
4,788,712 Howler indicator in cordless telephone system 3 1987
 
MLR, LLC (1)
RE39427 Cellular telephone data communication system and method 11 2001
 
OPUSWAVE NETWORKS, INC. (1)
5,884,148 Wireless local loop system and method 56 1996
 
SAMSUNG ELECTRONICS CO., LTD. (1)
5,712,911 Method and system for automatically activating and deactivating a speakerphone 33 1995
 
TELEMASTER CORPORATION (1)
4,644,105 Mobile telephone controller switch 6 1985
 
VERSUS TECHNOLOGY, INC. (1)
5,131,019 System for interfacing an alarm reporting device with a cellular radio transceiver 92 1990
 
WEST COMMUNICATIONS, INC., 1004 WINTER STREET, BUILDING D., JACKSON, MS. (1)
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XIRCOM, INC. (1)
6,208,627 Signaling and protocol for communication system with wireless trunk 52 1997
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (1)
8,036,343 Audio and data communications system 0 2006