US3647891A
Expired / Lapsed
US
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Methylol-terminated fluorocarbon polymers
Assignee: 3M Co
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Filing: 1968-07-01
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Granted: 1972-03-07
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Expires: 1988-07-01
Abstract
Abstract METHYL-TERMINATED FLUOROCARBON POLYMERS HAVING THE GENERAL FORMULA HO-CH2-(CF2)N((-CF2-CH2)X-(CF2-CF(-CF3))Y)M-(CF2)N-CH2-OH ARE PREPARED BY REDUCTION OF THE CORRESPONDING ESTER PRECURSORS, BY REDUCTION OF THE CORRESPONDING ESTER PREMETHYLOL-TERMINATED POLYMERS CAN BE CURED WITH POLYISOCYANATE CROSSLINKING AGENTS AND USED AS BINDERS IN SOLID ROCKET PROPELLANTS.
Inventors
- 👤 Basil L Loudas
- 👤 David E Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:06
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/04; C07C43/13; C07C43/137; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/62; C08G18/6275; C08G18/6279
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |