US3827023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric transducer having good sensitivity over a wide range of temperature and pressure
Assignee: United States Department of the Navy
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Filing: 1972-05-25
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Granted: 1974-07-30
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Expires: 1992-05-25
Abstract
Abstract An electroacoustic transducer wherein the sensing elements comprise a radially polarized ceramic cylinder having annular rings attached to the ends of the ceramic cylinder and a cylindrical insert, centered in said cylinder, is sealed by O rings between the insert and the annular rings. A pair of the ceramic cylinders are connected electrically to form an assembly. The assembly is mounted by rubber mounts in a frame which is surrounded by an expanded metal electrostatic shield. The whole assembly is enclosed within a castor oil filled butyl boot. The assembly has good sensitivity over a wide frequency range.
Inventors
- 👤 T Henriquez
- 👤 A Tims
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:58
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; B06B1/0655
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
An electroacoustic transducer which comprises: an elongated hollow cylindrical body comprising; an elongated hollow cylindrical piezoelectric element electrically responsive to incident pressure; a first end ring being concentrically bonded to a first end of said cylindrical piezoelectric element; a second end ring being concentrically bonded to a second end of said piezoelectric element; isolating means inserted within said elongated hollow cylindrical body for providing acoustical isolation to the inner wall of said cylindrical piezoelectric element; mounting means mounting said isolation means within said elongated hollow cylindrical body; said mounting means cooperating only radially and sealingly between said end rings and each end of said isolating means.
Claim 2
Dependent Claim
106 words
An electroacoustic transducer which comprises: an elongated hollow cylindrical body comprising; an elongated hollow cylindrical piezoelectric element electrically responsive to incident pressure; a first end ring being concentrically bonded to a first end of said cylindrical piezoelectric element; a second end ring being concentrically bonded to a second end of said piezoelectric element; isolating means inserted within said elongated hollow cylindrical body for providing acoustical isolation to the inner wall of said cylindrical piezoelectric element; mounting means mounting said isolation means within said elongated hollow cylindrical body; said mounting means cooperating only radially and sealingly between said end rings and each end of said isolating means.
Claim 3
Dependent Claim
14 words
The electroacoustic transducer described in claim 1 wherein said piezoelectric element is radially polarized.
Claim 4
Dependent Claim
46 words
The electroacoustic transducer described in claim 1 wherein said isolating means comprises: a solid cylinder of radius less than the inner radius of said cylindrical piezoelectric element and said end rings; said cylinder having a resonant frequency greater than the range of said cylindrical piezoelectric element.
Claim 5
Dependent Claim
21 words
The electroacoustic transducer described in claim 3 wherein said mounting means are O-rings mounted on each end of said solid cylinder.
Claim 6
Dependent Claim
45 words
The electroacoustic transducer described in claim 4 wherein said cylindrical piezoelectric element is mounted in rubber bushings, surrounded by castor oil; said rubber bushings being supported by expanded cylindrical metal shield means for providing mechanical support to said elements and for providing an electrostatic shield.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |