Patent US3764965A successfully refreshed from Google Patents.
US3764965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projector of acoustic energy
Assignee: United States Department of the Navy
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Filing: 1972-06-16
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Granted: 1973-10-09
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Expires: 1992-06-16
Abstract
Abstract A hydroacoustic transducer having a motor-pump unit drawing in ambient water impells the water to a chamber and through a rotary shutter unit which modulates the flow in an on-off sequence. The on-off modulated flow passes through an interposed venturi section creating a corresponding sequence of positive and negative hydraulic pressure impulses. These impulses are fed to the radiating surfaces of an acoustic-energy projector to reciprocally displace them accordingly. Having the transducer substantially filled with water renders it relatively insensitive to ambient pressure variations to ensure reliable operation irrespective of depth.
Inventors
- 👤 Lean W Mc
- 👤 S Christie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:33
CPC Classifications
G; G10; G10K; G10K9/00; G10K9/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
In a transducer of acoustic energy having a motor pump unit drawing in water from the immediate surroundings for impelling the water and a rotary water chopper unit for sequentially interrupting the flow of the impelled water and for expelling the impelled water back to the immediate surroundings, an improvement therefor is provided comprising: a venturi section provided with at least one slot interconnecting the motor pump unit and the water chopper unit for increasing the flow rate of impelled fluid therethrough creating negative hydraulic pressure impulses when said water chopper unit allows said flow of impelled fluid and positive hydraulic pressure impulses when said flow is interrupted. and means in fluid communication with said slot for being bidirectionally displaced in response to the positive and negative hydraulic pressure impulses to project representative acoustic energy.
Claim 2
Dependent Claim
135 words
In a transducer of acoustic energy having a motor pump unit drawing in water from the immediate surroundings for impelling the water and a rotary water chopper unit for sequentially interrupting the flow of the impelled water and for expelling the impelled water back to the immediate surroundings, an improvement therefor is provided comprising: a venturi section provided with at least one slot interconnecting the motor pump unit and the water chopper unit for increasing the flow rate of impelled fluid therethrough creating negative hydraulic pressure impulses when said water chopper unit allows said flow of impelled fluid and positive hydraulic pressure impulses when said flow is interrupted. and means in fluid communication with said slot for being bidirectionally displaced in response to the positive and negative hydraulic pressure impulses to project representative acoustic energy.
Claim 3
Dependent Claim
37 words
A transducer according to claim 1 in which the bidirectionally displaced means is formed of at least one panel of flexible material being outwardly and inwardly flexed upon receipt of said positive and negative hydraulic pressure impulses.
Claim 4
Dependent Claim
29 words
A transducer according to claim 1 in which the bidirectionally displaced means is an envelope of elastic material pulsating in response to said positive and negative hydraulic pressure impulses.
Claim 5
Dependent Claim
33 words
A transducer according to claim 3 in which said bidirectionally displaced means further includes a wire mesh covering for protecting the elastic envelope from envirionmental abuses and excessive said positive hydraulic pressure impulses.
Claim 6
Dependent Claim
73 words
A transducer according to claim 1 in which the bidirectionally displaced means includes, a tubularly-shaped element in fluid communication with said slot, a cup-shaped radiation dome coaxially disposed on said tubularly-shaped element and in fluid communication with said slot, and at least one annular wear-strip interposed between said tubularly-shaped element and said radiation dome for enSuring responsive reciprocal excursions of said radiation dome in response to said positive and negative hydraulic pressure impulses.
Claim 7
Dependent Claim
46 words
A transducer according to claim 5 in which said tubularly-shaped element mounts a separate radiation dome at opposite axial extremes with a separate interposed annular wear strip for each dome for imparting simultaneous opposed reciprocal excursions in response to said positive and negative hydraulic pressure impulses.
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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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |