Title:
Acoustic communication device and toy
United States Patent 3305043
US Patent References:
/0220169.html
- - 0220169

/0958680.html
- - 0958680

/1040775.html
- - 1040775

Means for receiving and sending directional sound rays
- - 1649538

Packaging device
- - 1889966


Inventors:
Pfund, Charles E.
Dawson, John W.
Publication Date:
02/21/1967
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Assignee:
Pfund, Charles E.
Dawson, John W.
Primary Class:
181/128
Other Classes:
381/338, 367/149, 181/.500, 181/20, 381/160, 367/151
International Classes:
A63H33/00
US Patent References:
1899994Conversion of sound into electrical impulses
1911772
2017122Double reflector type microphone
2052550Gravimetric determination of sound amplitudes
2228024Directive acoustic pickup
2496988Megaphone, including mouth- and earpieces
2534847Directional sound detector