Title:
Speech privacy apparatus
Document Type and Number:
United States Patent 2531435


Inventors:
Hoth, Daniel F.
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Sponsored by:
Flash of Genius
Publication Date:
11/28/1950
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Assignee:
Hoth, Daniel F.
Primary Class:
380/22
Other Classes:
360/8
International Classes:
H04K1/06
US Patent References:
1366617Telegraphone
2105016Telephone transmission system
2394990Recording system in seismic surveying
2401464Privacy system
2401888Cryptographic communications system
Foreign References:
GB385535A