Murphy; Preston V.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Murphy; Preston V..The latest application filed is for "shielded electret transducer and method of making the same".
- Murphy; Preston V. - Geneva CH
- Murphy; Preston V. - Weston MA
- Murphy; Preston V. - Barcelona ES
| Patent | Date |
|---|---|
| Shielded electret transducer and method of making the same Grant 4,993,072 - Murphy February 12, 1 | 1991-02-12 |
| Electret transducing Grant 4,764,690 - Murphy , et al. August 16, 1 | 1988-08-16 |
| Piezoelectric film device for conversion between digital electric signals and analog acoustic signals Grant 4,469,920 - Murphy September 4, 1 | 1984-09-04 |
| Electro-acoustic transducer with plural piezoelectric film Grant 4,453,044 - Murphy June 5, 1 | 1984-06-05 |
| Electret transducer with tapered acoustic chamber Grant 4,331,840 - Murphy , et al. May 25, 1 | 1982-05-25 |
| Preventing marine fouling Grant 4,170,185 - Murphy , et al. October 9, 1 | 1979-10-09 |
| Unidirectional condenser microphone Grant 3,963,881 - Fraim , et al. June 15, 1 | 1976-06-15 |
| Electret Earphone Grant 3,896,274 - Fraim , et al. July 22, 1 | 1975-07-22 |
| Electret Transducer Cartridge And Case Grant 3,816,671 - Fraim , et al. June 11, 1 | 1974-06-11 |
| Method Of Making An Electret Grant 3,702,493 - Murphy November 14, 1 | 1972-11-14 |
| Electret Acoustic Transducer And Method Of Making Grant 3,612,778 - Murphy October 12, 1 | 1971-10-12 |
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