US3810875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorine-containing block copolymers
Assignee: Individual
•
Filing: 1971-08-02
•
Granted: 1974-05-14
•
Expires: 1991-08-02
Abstract
Abstract POLY(PERFLUORALKYLENE OXIDE) POLYPEROXIDES, SUCH AS THE DIACYL PEROXIDE OF POLY(PERFLUOROALKYLENE OXIDE), ARE USED TO INITIATE THE FREE RADICAL POLYMERIZATION OF ETHYLENICALLY-UNSATURATED MONOMERS TO PRODUCE BLOCK COPOLYMERS COMPRISING ALTERNATING POLY(PERFLUOROALKYLENE OXIDE) BLOCKS AND POLYALKYLENE BLOCKS. THESE BLOCK COPOLYMERS AS SUCH OR AS CROSS-LINKED, HAVE VERY GOOD LOW TEMPERATURE FLEXIBILITY, I.E., LOW GLASS TRANSITION TEMPERATURES, WHICH MAKES THEM VERY USEFUL FOR GASKETS, O-RINGS, SEALANTS, AND OTHER SHAPED ARTICLES WHICH CAN BE USED EVEN IN CRYOGENIC ENVIRONS.
Inventors
- 👤 R Hansen
- 👤 D Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:54
CPC Classifications
C; C08; C08F; C08F293/00; C08F283/00; C08F283/06
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) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |