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Class Information
Number: 379/215.01
Name: Telephonic communications > Special services > Call waiting
Description: Subject matter for signalling a first station in communication with a second station that a third station desires communication with the first station.

Patents under this class:
1 2 3 4 5 6 7 8 9

Patent Number Title Of Patent Date Issued
5668861 Telecommunications system with notification hold Sep. 16, 1997
5668853 Telecommunications calling feature method and apparatus Sep. 16, 1997
5651054 Method and apparatus for monitoring a message in a voice mail system Jul. 22, 1997
5651060 Method and apparatus for detecting and recovering from call waiting interruptions to modem communications Jul. 22, 1997
5636269 Intelligent call waiting Jun. 3, 1997
5619561 Call-waiting and caller identification with three-way conversations arrangements Apr. 8, 1997
5604796 Method for automatically controlling a call-waiting-interruption restriction and switching system Feb. 18, 1997
5600654 Multiple call offering method for use with an analog station and an ISDN station that share a directory number Feb. 4, 1997
5590183 Keep call back device Dec. 31, 1996
5579380 Method and apparatus for processing telephone calls from one line to another Nov. 26, 1996
5557660 Program-controlled communication system whereby a call request is simultaneously signaled at a plurality of communication terminal equipment Sep. 17, 1996
5557658 Communications marketing system Sep. 17, 1996
5550908 Modem communications interoperability with services equipped to provide calling party identity delivery with call waiting Aug. 27, 1996
5546451 Call waiting cancellation device Aug. 13, 1996
5539814 Method and apparatus for informing active subscriber of disconnection of held subscriber in call-waiting service Jul. 23, 1996
5537465 Integrated telephone and intercom system Jul. 16, 1996
5533102 Telephone auto attendant system for delivering chosen greetings to callers while on the phone Jul. 2, 1996
5519767 Voice-and-data modem call-waiting May. 21, 1996
5513251 Method for providing call waiting service Apr. 30, 1996
5511111 Caller name and identification communication system with caller screening option Apr. 23, 1996
5491744 Selective call waiting Feb. 13, 1996
5432616 Data communication apparatus for notification of the receipt of a call waiting signal Jul. 11, 1995
5425092 Delayed cancel call waiting Jun. 13, 1995
5420918 Telephone apparatus for invalidating incoming call signals during dialing May. 30, 1995
5418846 Call waiting indicating method and system May. 23, 1995
5410591 Private branch exchange with resumption of interrupted communication Apr. 25, 1995
5369688 Data communication apparatus with interrupt completion detecting Nov. 29, 1994
5363429 Radio telephone device capable of identifying an interrupting caller and telephone system using the same Nov. 8, 1994
RE34735 Call waiting arrangement providing options to both a subsequent calling party and to the called party Sep. 20, 1994
5327488 Remotely initiated telemetry calling system Jul. 5, 1994
5309512 Call waiting deluxe feature May. 3, 1994
5287401 Apparatus and method for a modem for detecting a call waiting signal Feb. 15, 1994
5263084 Spontaneous caller identification with call-waiting Nov. 16, 1993
5172408 Speakerphone state-controlled alerting arrangement Dec. 15, 1992
5159626 Multi-line telephone switching system Oct. 27, 1992
5034975 Voice announcement device for improving functionality of multi-line telephones Jul. 23, 1991
5023868 Automated call handling apparatus Jun. 11, 1991
5007076 Call announcement arrangement Apr. 9, 1991
4995074 Switched line modem interface system Feb. 19, 1991
4989235 Integrated communication system for ensuring effective use of channels Jan. 29, 1991
4975944 Method of making call-wait and call-alternation in electronic private branch exchange (EPBX) Dec. 4, 1990
4947421 Call waiting arrangement providing options to both a subsequent calling party and to the called party Aug. 7, 1990
4942601 Method of making a call reservation and sending an interrupt tone in a private branch exchange (PBX) Jul. 17, 1990
4922490 Telephone station set May. 1, 1990
4922523 Videotex with telephone call screening system May. 1, 1990
4899374 Method for a program-controlled telephone switching system in which performance features relating to the setup of a call connection can be initiated from a subscriber station Feb. 6, 1990
4899358 Call announcement arrangement Feb. 6, 1990
4881261 Method for predictive pacing of calls in a calling system Nov. 14, 1989
4876711 Series connected telephone service system Oct. 24, 1989
4873719 Enhanced calling number delivery service system Oct. 10, 1989

1 2 3 4 5 6 7 8 9

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