Patent US3781237A successfully refreshed from Google Patents.
US3781237A
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Use of a polysiloxane to eliminate surface flaws in imide and amide-imide polymer films
Assignee: Westinghouse Electric Corp
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Filing: 1972-07-13
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Granted: 1973-12-25
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Expires: 1992-07-13
Abstract
Abstract A CASTING SOLUTION, COMPRISING A SOLVENT SOLUTION OF AN AROMATIC POLYAMIC ACID AND AN EFFECTIVE AMOUNT OF A LOWER ALKYL POYORGANOSILOXANE, IS APPLIED AS A WET FILM TO A SUBSTRATE AND CURED AT AN ELEVATED TEMPERATURE TO PROVIDE DEFECT FREE HIGH TEMPERATURE POLYIMIDE AND POLYAMIDE-IMIDE FILMS.
Inventors
- 👤 W Alvino
- 👤 W Koryak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:16
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1057; C08G73/106; C08G77/00; C08G77/42; C08G77/452; C08G77/455; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3432; C08K5/3435; C08L; C08L79/00; C08L79/04; C08L79/08; H; H10; H10P; H10P14/00; H10P14/60; H10P14/63; H10P14/6326; H10P14/6342
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |