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Class Information
Number: 455/462
Name: Telecommunications > Radiotelephone system > Including private cordless extension system
Description: Subject matter wherein a base transceiver having direct connection to a landline telephone switching system provides restricted telephony access to a pre-selected cordless extension unit.










Sub-classes under this class:

Class Number Class Name Patents
455/464 Channel selection or allocation 683
455/463 Multi-users 269


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13

Patent Number Title Of Patent Date Issued
5305371 Cordless key telephone system for repeating attempts to alert stations located in interference-affected zones Apr. 19, 1994
5297203 Digital cordless telephone apparatus Mar. 22, 1994
5280541 Cordless telephone communication system link re-establishment protocol Jan. 18, 1994
5259003 Method of encoding two digital data signals Nov. 2, 1993
5243646 Fast redial system for a telephone Sep. 7, 1993
5233644 Cordless telephone with actuation of off-hook condition by operation of dial key Aug. 3, 1993
5231657 Cordless telephone system that releases hold state of handset after intrusion by another party is detected Jul. 27, 1993
5224146 Radio telephone system for calling a party at predetermined invervals until a response is received Jun. 29, 1993
5218628 Radio communication apparatus with means for requesting and displaying status of wired line Jun. 8, 1993
5210788 Telephone instrument and distribution system May. 11, 1993
5201066 Radio-telephone system employing a manner of changing a channel and a privacy digital code and interstoring them between a stationary apparatus and a portable apparatus by wireless and a metho Apr. 6, 1993
5191593 Conference call feature for spread spectrum cordless telephone Mar. 2, 1993
5168516 Radio telephone having improved modulation characteristics for data transmission Dec. 1, 1992
5157710 Radio telephone system and method of registering an ID code therein Oct. 20, 1992
5153904 Radio communication controller for subscriber-requested calling code prefacing Oct. 6, 1992
5148470 Radio telephone apparatus having an instantaneous conversation function Sep. 15, 1992
5138651 Cordless loud speaking telephone Aug. 11, 1992
5111499 Cordless telephone apparatus having a ringer circuit operable during power failure May. 5, 1992
5109537 Telecommunication apparatus having an ID rechecking function Apr. 28, 1992
5105460 Plug-in telephone facility Apr. 14, 1992
5097500 Radio telephone system which writes an identification code via radio link when units are electrically connected Mar. 17, 1992
5086452 Radio telephone system and its control method Feb. 4, 1992
5073932 Secured data transmission and error recovery mechanism in cordless telephones Dec. 17, 1991
5068889 Cordless telephone capable of programming an ID code into both a base and cordless remote unit via the cordless remote unit Nov. 26, 1991
5058151 Multi-user cordless telephone capable of discernibly notifying each user Oct. 15, 1991
5046081 Radio telephone with variable attenuator for controlling modulated signal Sep. 3, 1991
5010565 Apparatus and method for adding cordless handset capability to an existing corded telephone Apr. 23, 1991
4998271 Telephone accessory Mar. 5, 1991
4995072 Self-powered base and remote telephone communication set Feb. 19, 1991
4982401 Method and apparatus for detecting transmission errors in cordless telephones Jan. 1, 1991
RE33507 Cordless telephone with automatic telephone answering/recording function Dec. 25, 1990
4979205 Cordless telephone Dec. 18, 1990
4974251 Cordless telephone system Nov. 27, 1990
4972454 Radio telephone apparatus and a method of controlling same Nov. 20, 1990
4969205 Radio communication system Nov. 6, 1990
4939766 Radio telephone system Jul. 3, 1990
4939769 Cordless telephone system Jul. 3, 1990
4937852 Corded to cordless telephone converter Jun. 26, 1990
4930149 Cordless telephone communication system May. 29, 1990
4920557 Radio communication apparatus Apr. 24, 1990
4908847 Adaptor set for converting standard telephone into cordless telephone Mar. 13, 1990
4882746 Cordless telephone system Nov. 21, 1989
4881259 Answering machine with cordless telephone Nov. 14, 1989
4879740 Wide area cordless telephone system having means for avoiding double registrations Nov. 7, 1989
4876708 Cordless telephone system Oct. 24, 1989
4853951 Cordless telephone with in-range monitoring Aug. 1, 1989
4839918 Switching system between cordless telephone and ordinary telephone Jun. 13, 1989
4837801 Base station capable of monitoring occurrence of interference on every transmission Jun. 6, 1989
4805203 Cordless telephone system Feb. 14, 1989
4802201 Control system of a radio telephone apparatus Jan. 31, 1989

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