Door-mounted combination intercom and viewer

Details Door-mounted combination intercom and viewer Door-mounted combination intercom and viewer

1984-04-27

1986-04-22

George, Keith E.

H04M 900

Patent

active

045844364

ABSTRACT:
An improved door-mounted combination intercom and viewer is provided including a pair of identical housings, each having a microphone and a speaker therein. The microphones are isolated from contact with the housings by a vibration damping material to prevent feedback.

REFERENCES:
patent: 1890742 (1932-12-01), Messmer
patent: 2169874 (1939-08-01), Hardt
patent: 2262203 (1941-11-01), Redstone et al.
patent: 2281608 (1942-05-01), Vincent
patent: 2341539 (1944-02-01), Giannini
patent: 3404234 (1968-10-01), Batt et al.
patent: 3482037 (1969-12-01), Brown et al.
patent: 3935994 (1976-02-01), Darvishian
patent: 4049911 (1977-09-01), Schlaff et al.
patent: 4116529 (1978-09-01), Yamaguchi
patent: 4130728 (1978-12-01), Gramel
patent: 4178488 (1979-12-01), Nishihata
patent: 4273956 (1981-06-01), Wolfe
patent: 4281738 (1981-08-01), Jackson
patent: 4410770 (1983-10-01), Hagey

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