US3634342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Depottable polyurethane foam
Assignee: Lockheed Martin Corp
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Filing: 1967-08-28
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Granted: 1972-01-11
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Expires: 1987-08-28
Abstract
Abstract RIGID POLYURETHANE FOAMS ARE USED TO POT ELECTRONIC COMPONENTS, THAT IS, TO PROTECTIVELY ENCAPSULATE THE COMPONENTS WITHIN THE FOAM. A PROBLEM EXISTS IN SUBSEQUENT REMOVAL OF THE FOAM SHOULD IT BE DESIRABLE TO TEST OR REPAIR THESE COMPONENTS. THE INVENTION CONCERNS THE DISCOVERY THAT A SMALL AMOUNT OF SODIUM SILICATE BLENDED WITH THE FOAM CONSTITUENTS WILL RENDER THE SAM SOLUBLE IN AN ALCOHOL-WATER SOLUTION.
Inventors
- 👤 Russell D Boblitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:41
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08K; C08K3/00; C08K3/34; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/302; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 0
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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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |