US3947802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Omnidirectional low noise piezoelectric transducer
Assignee: United States Department of the Navy
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Filing: 1972-06-12
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Granted: 1976-03-30
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Expires: 1992-06-12
Abstract
Abstract A piezoelectric ceramic transducer assembly for broadband noise-measuring drophone. A longitudinally polarized lead zirconate-titanate cylinder provided with end caps is sealed by O-rings within a circumferentially polarized lead zirconate-titanate cylinder providing high sensitivity, smooth response, omnidirectionality, and stability with temperature and hydrostatic pressure variations.
Inventors
- 👤 Allan C. Tims
- 👤 Theodore A. Henriquez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:23
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; B06B1/0655
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
57 words
An electroacoustic transducer which comprises, a circumferentially polarized piezoelectric cylinder, a longitudinally polarized piezoelectric cylinder sealingly capped by two concentric imperforate diaphragms, and isolation means sealingly mounting said longitudinally polarized cylinder and diaphragms concentrically within said circumferentially polarized cylinder, said isolation means cooperating only radially between said diaphragms and the inner ends of said circumferentially polarized cylinder.
Claim 2
Dependent Claim
57 words
An electroacoustic transducer which comprises, a circumferentially polarized piezoelectric cylinder, a longitudinally polarized piezoelectric cylinder sealingly capped by two concentric imperforate diaphragms, and isolation means sealingly mounting said longitudinally polarized cylinder and diaphragms concentrically within said circumferentially polarized cylinder, said isolation means cooperating only radially between said diaphragms and the inner ends of said circumferentially polarized cylinder.
Claim 3
Dependent Claim
35 words
The electroacoustic transducer of claim 1 wherein, said diaphragms have a radius less than the inner radius of said circumferentially polarized cylinder and said isolation means are O-rings mounted on the rims of said diaphragms.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |