|
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| US4431873 | 8. Dez. 1981 | 14. Febr. 1984 | Her Majesty the Queen in right of Canada, as represented by the Minister of National Defence | Diaphragm design for a bender type acoustic sensor |
| US4485321 | 29. Jan. 1982 | 27. Nov. 1984 | The United States of America as represented by the Secretary of the Navy | Broad bandwidth composite transducers |
| US4631436 | 13. Juli 1984 | 23. Dez. 1986 | Siemens Aktiengesellschaft | Transducer plate for piezoelectric transducers |
| US4810913 | 19. Aug. 1987 | 7. März 1989 | Institut Francais du Petrole | Increased sensitivity piezoelectric hydrophones |
| US5889731 | 27. Okt. 1997 | 30. März 1999 | Institut Francais du Petrole | Vibration detector |
