Open hemispherical transducers
United States Patent 3230504

Inventors:
Horan, John J.
Brown Jr., James R.
Pressler, Maurice F.
Publication Date:
01/18/1966
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Assignee:
Horan, John J.
Brown Jr., James R.
Pressler, Maurice F.
Primary Class:
367/157
Other Classes:
310/337, 310/371
International Classes:
B06B1/06
US Patent References:
2939970Spherical transducer
2966656Spherical electro-acoustic transducer with internal heater
3037263Method of producing piezoelectric crystal devices
3048912Method of forming a stable aluminum plated quartz resonator
3059130Electromechanical transducers