Cordless telephone system

Details Cordless telephone system Cordless telephone system

1988-07-08

1990-07-03

Lev, Robert

Telephonic communications

Audio message storage, retrieval, or synthesis

379 62, H04Q 704

Patent

active

049397699

ABSTRACT:
A cordless telephone system which allows, in addition to outside-line communication, extension communication between wire and wireless telephone sets and also which can prevent wiretapping of communication contents during the outside-line communication. The system comprises a first switch connecting a connection unit to a wire telephone circuit, a connector connecting the wire telephone set to a connection-unit terminal of the first switch, a second switch switchingly controlled by the connection unit to supply a predetermined DC current to the connection-unit terminal of the first switch, and a DC power source for outputting the predetermined DC current. Further provided in the system, in addition to the above arrangement, are a third switch connected as inserted between the connection-unit terminal of the first switch and a voice circuit of the connection unit and a fourth switch connected as inserted between the connection-unit terminal of the first switch and the connector.

REFERENCES:
patent: 3941943 (1976-03-01), Matheny
patent: 4075434 (1978-02-01), Merritt, Jr.
patent: 4218590 (1980-08-01), Rasmussen et al.
patent: 4291199 (1981-09-01), Densmore et al.
patent: 4468539 (1984-08-01), Schober
patent: 4639549 (1987-01-01), Hirayama et al.
patent: 4640987 (1987-02-01), Tsukada et al.
patent: 4650931 (1987-03-01), Tsukada et al.
patent: 4706274 (1987-11-01), Baker et al.
patent: 4805210 (1989-02-01), Griffith, Jr.
patent: 4809317 (1989-02-01), Howe et al.

Affiliated with

Also associated with

Rating

Cordless telephone system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cordless telephone system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cordless telephone system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1896804