US3763204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerizable disilanols having in chain perfluoroalkyl groups
Assignee: National Aeronautics and Space Administration
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Filing: 1972-01-20
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Granted: 1973-10-02
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Expires: 1992-01-20
Abstract
Abstract DISILANOLS HAVING THE FORMULA HO-SI(-R)2-AR-(CF2)X-AR-SI(-R)2-OH WHERE R IS A MONOVALENT HYDROCARBON RADICAL, AR IS AN ARYLENE GROUP AND X IS FROM 2 TO 8 AND A PROCESS FOR PREPARING THE SAME ARE DISCUSSED. THE DISILANOLS, WHEN REACTED WITH A DIAMINOSILANE AND CURED, PRODUCE POLYMERIC MATERIAL RESISTANT TO HYDROCARBON FUELS AND STABLE AT ELEVATED TEMPERATURES.
Inventors
- 👤 W Patterson
- 👤 D Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:57
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0836; C08; C08G; C08G77/00; C08G77/48; C08G77/50; C08G77/52
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |