Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4993072 | Shielded electret transducer and method of making the same | — | 1991-02-12 |
| 4764690 | Electret transducing | Kurt Hubschi | 1988-08-16 |
| 4469920 | Piezoelectric film device for conversion between digital electric signals and analog acoustic signals | — | 1984-09-04 |
| 4453044 | Electro-acoustic transducer with plural piezoelectric film | — | 1984-06-05 |
| 4331840 | Electret transducer with tapered acoustic chamber | Kurt Hubschi | 1982-05-25 |
| 4295010 | Plural piezoelectric polymer film acoustic transducer | — | 1981-10-13 |