US3756345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater acoustic device
Assignee: Honeywell Inc
•
Filing: 1972-02-10
•
Granted: 1973-09-04
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Expires: 1992-02-10
Abstract
Abstract A pressure insensitive underwater acoustic element useful as an acoustic reflector or an acoustic decoupler uses a body of balsa wood which is isostatically precompressed to between about 2,500 pounds per square inch and about 20,000 pounds per square inch.
Inventors
- 👤 Amico P D
- 👤 R Higgs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:32
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/74
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
54 words
A pressure insensitive underwater acoustic device comprising a body of balsa wood precompressed to between about 2,500 pounds per square inch and about 20,000 pounds per square inch, the body being oriented such that the direction along the grain of the balsa wood is essentially normal to longitudinal acoustic waves impinging on the device.
Claim 2
Dependent Claim
54 words
A pressure insensitive underwater acoustic device comprising a body of balsa wood precompressed to between about 2,500 pounds per square inch and about 20,000 pounds per square inch, the body being oriented such that the direction along the grain of the balsa wood is essentially normal to longitudinal acoustic waves impinging on the device.
Claim 3
Dependent Claim
51 words
The pressure insensitive underwater acoustic device of claim 1 wherein the device has a thickness essentially equal to n lambda /4, where n is an odd integer and lambda is the acoustic wavelength in the balsa wood calculated at the midband frequency of the longitudinal acoustic waves impinging on the device.
Claim 4
Dependent Claim
16 words
The pressure insensitive underwater acoustic device of claim 1 wherein the device is an acoustic decoupler.
Claim 5
Dependent Claim
16 words
The pressure insensitive underwater acoustic device of claim 1 wherein the device is an acoustic reflector.
Claim 6
Dependent Claim
27 words
The pressure insensitive underwater acoustic device of claim 4 and further comprising a water impervious coating over the body of balsa wood for preventing water contamination thereof.
References Cited (Backward Citations)
GB157229A
Cited
US1549320A
Cited
US1817086A
Cited
US1880153A
Cited
US2963681A
Cited
US3663934A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |