US3764432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making an acoustic window including filling honeycomb cellsindividually
Assignee: United States Department of the Navy
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Filing: 1971-03-15
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Granted: 1973-10-09
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Expires: 1991-03-15
Abstract
Abstract Disclosed is an improved acoustic window or lens comprising a metallic core element and a thermoplastic filler which is shaped to conform to complex curves. A method of manufacture is also disclosed, wherein voids in said core are filled with particles of thermoplastic and the heated to melt the particles into a fluid which hardens to fill the voids.
Inventors
- 👤 J Bealor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:31
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/0074; B29D11/00009; B29D11/00365; B29D11/00375; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24157
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
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 |