Intercom system

Details Intercom system Intercom system

1984-09-24

1986-12-23

George, Keith E.

Telephonic communications

Private or single line system

Doorbell system

379 56, H04M 900

Patent

active

046313656

ABSTRACT:
The invention is directed to an intercom system for communication between persons on opposite sides of an entry door or the like. On a first embodiment the intercom device is energized by the person on the exterior of the door when a combined power and door buzzer or bell switch is depressed. When energized, voice communication can be established by the combined speaker, microphone and amplifying devices. A sound activated switch positioned on the interior side of the entry door allows hands free communication between the persons on the opposite sides of the door. A timer terminates the system power after a predetermined time span. In a second embodiment, a pair of radio frequency transceivers are employed with the intercom device to allow communication by the person on the interior side of the door who is located remote from the door.

REFERENCES:
patent: 3453390 (1969-07-01), Durkee et al.
patent: 3849603 (1974-11-01), Proios
patent: 4006310 (1977-02-01), Bayer
patent: 4172967 (1979-10-01), Porter et al.
patent: 4427847 (1984-01-01), Hofmann et al.
patent: 4554411 (1985-11-01), Armstrong

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-172567