US3614992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sandwich-type acoustic material in a flexible sheet form
Assignee: United States Department of the Navy
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Filing: 1969-05-26
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Granted: 1971-10-26
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Expires: 1989-05-26
Abstract
Abstract A SANDWICH-TYPE, ELECTRO-MECHANICAL, ABSORBING, ACOUSTIC MATERIAL, IN A FLEXIBLE SHEET FORM, COMPRISING A THIN SHEET OF ELASTOMERIC MATERIAL WITHIN WHICH ARE EMBEDDED PATICLES HAVING A SIZE BARELY GREATER THAN THE THICKNESS OF THE ELASTOMERIC MATERIAL. THE PARTICLES MAY BE OF A TRANSDUCER MATERIAL, GENERALLY SINGLE-CRYSTAL, AND/OR OF A RESISTIVE MATERIAL. TWO CONDUCTIVE SHEETS, ONE ON EACH SIDE OF THE ELASTIMERIC MATERIAL, WHICH MAKE CONTACT WITH THE EMBEDDED PARTICLES COMPLETE THE SANDWICH.
Inventors
- 👤 Harper John Whitehouse
- 👤 Shelby F Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:12
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/168; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/8409; G10K11/165; E04B2001/8457; E04B2001/8461; E04B2001/8471; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31605; Y10T428/31609
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |