Telephone enclosure with sound prevention means

Details Telephone enclosure with sound prevention means Telephone enclosure with sound prevention means

1974-07-29

1976-06-15

Brown, Thomas W.

179 81E, H04M 119

Patent

active

039638839

ABSTRACT:
A device for preventing the unauthorized use of a telephone for surveillance purposes when the telephone is not in use, consisting of a sound-proof housing of sufficient size as to completely enclose the telephone and its handset. The sound-proof housing has means for acoustically isolating the enclosed telephone from reception of outside sounds when it is closed. Further means are provided to generate sounds within the sound-proof housing when it is closed and the telephone is not in use, so as to prevent surveillance of those sounds which might penetrate the housing.

REFERENCES:
patent: 925775 (1909-06-01), Hutton et al.
patent: 2371968 (1945-03-01), Lum
patent: 2932693 (1960-04-01), Wilcox, Jr.
patent: 3372236 (1968-03-01), Schwartz

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