Patent US4131726A successfully refreshed from Google Patents.
US4131726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfluoroelastomers from hydrofluoroelastomers
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1977-02-14
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Granted: 1978-12-26
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Expires: 1997-02-14
Abstract
Abstract This invention relates to new and improved fluoroelastomers having fluorinated crosslinks and more specifically to fluoroelastomers containing ether groups and perfluorovinylether groups, the fluoroelastomer having been crosslinked with a hydrocarbon cure catalyst and then reacted with fluorine.
Inventors
- 👤 Jon W. Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:23
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20; C08F8/22
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
82 words
An improved method of making a perfluoroelastomer of tetrafluoroethylene, perfluoro (alkyl vinyl ether), and a cross-linking component, wherein said perfluoroelastomer is vulcanized by the reaction between the cross-linking component and a difunctional curing agent including carbon to hydrogen bonds that remain intact after vulcanization, the improvement comprising fluorinating the vulcanized perfluoroelastomer to replace the hydrogen atoms of the reacted curing agent with fluorine atoms to a sufficient degree that the fluorinated elastomer is substantially more resistant to oxidation than the non-fluorinated elastomer.
Claim 2
Dependent Claim
82 words
An improved method of making a perfluoroelastomer of tetrafluoroethylene, perfluoro (alkyl vinyl ether), and a cross-linking component, wherein said perfluoroelastomer is vulcanized by the reaction between the cross-linking component and a difunctional curing agent including carbon to hydrogen bonds that remain intact after vulcanization, the improvement comprising fluorinating the vulcanized perfluoroelastomer to replace the hydrogen atoms of the reacted curing agent with fluorine atoms to a sufficient degree that the fluorinated elastomer is substantially more resistant to oxidation than the non-fluorinated elastomer.
Claim 3
Dependent Claim
18 words
The improved method of making a perfluoroelastomer of claim 1 where the cross-linking component includes a perfluorophenyl group.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |