Patent US3760346A successfully refreshed from Google Patents.
US3760346A
Expired / Lapsed
US
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High-power underwater electroacoustic transducer for the infrasonic and low audio-frequency range
Assignee: United States Department of the Navy
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Filing: 1972-05-08
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Granted: 1973-09-18
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Expires: 1992-05-08
Abstract
Abstract This disclosure is directed to a high power underwater electroacoustic transducer operable in the infrasonic and low audiofrequency range.
Inventors
- 👤 J Donovan
- 👤 R Kieser
- 👤 J Bass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:59
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
144 words
An improved transducer element including a fluid tight housing enclosed by a compliant front window and a compliant compensating bag in the back area thereof with a magnet element fixed in the housing, between said front window and said compensating bag, the improvement comprising, a compliant support member secured to said magnet element, a voice coil assembly within said housing secured to said compliant support member at its rearward end for axial movement relative to said magnet element, a piston secured to the front end of said voice coil assembly, a centering pin in combination with said piston extending along the axis operative to prevent off-axis movement of said piston and said voice coil during axial movement, and a permanent magnet ''''charging'''' coil wound about a central portion of said magnet element for permanently magnetizing said magnet element subsequent to assembly into said housing.
Claim 2
Dependent Claim
144 words
An improved transducer element including a fluid tight housing enclosed by a compliant front window and a compliant compensating bag in the back area thereof with a magnet element fixed in the housing, between said front window and said compensating bag, the improvement comprising, a compliant support member secured to said magnet element, a voice coil assembly within said housing secured to said compliant support member at its rearward end for axial movement relative to said magnet element, a piston secured to the front end of said voice coil assembly, a centering pin in combination with said piston extending along the axis operative to prevent off-axis movement of said piston and said voice coil during axial movement, and a permanent magnet ''''charging'''' coil wound about a central portion of said magnet element for permanently magnetizing said magnet element subsequent to assembly into said housing.
Claim 3
Dependent Claim
76 words
An improved transducer as claimed in claim 1; wherein, said magnet includes an outer front pole piece with an inner front face facing the axis of said housing, said voice coil assembled adjacent the front face of said front pole piece, and said outer front pole piece includes apertures therethrough adjacent said voice coil to permit fluid flow to the back of said outer front pole piece and surrounding said voice coil for cooling the magnet.
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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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |