Title:
Acoustic communication device and toy
United States Patent 3305043
Inventors:
Pfund, Charles E.
Dawson, John W.
Publication Date:
02/21/1967
Export Citation:
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Assignee:
Pfund, Charles E.
Dawson, John W.
Primary Class:
181/128
Other Classes:
181/.5, 181/20, 367/149, 367/151, 381/160, 381/338
International Classes:
A63H33/00; A63H33/00
View Patent Images:
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US Patent References:
2534847Directional sound detector
2496988Megaphone, including mouth- and earpieces
2228024Directive acoustic pickup
2052550Gravimetric determination of sound amplitudes
2017122Double reflector type microphone
1911772N/A
1899994Conversion of sound into electrical impulses
1889966Packaging device
1649538Means for receiving and sending directional sound rays
1040775N/A
0958680N/A
0220169N/A