Patent US3008077A successfully refreshed from Google Patents.
US4529784A
Expired / Lapsed
US
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Fluorinated copolymers with improved cure site
Assignee: EIDP Inc
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Filing: 1983-07-11
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Granted: 1985-07-16
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Expires: 2003-07-11
Abstract
Abstract Copolymers of tetrafluoroethylene and perfluoromethyl perfluorovinyl ether with a cure-site monomer of the formula R1CH=CR2R3 wherein R1 and R2 are independently selected from hydrogen and fluorine and R3 is independently selected from hydrogen, fluorine and alkyl or perfluoroalkyl.
Inventors
- 👤 Joseph B. Finlay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:25
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/262
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
A copolymer, the elastomeric vulcanizate of which is suitable for use where extraordinary resistance to environmental attack by corrosive liquids at elevated temperatures is required, comprising copolymerized units of: (a) 53-79.9 mole percent tetrafluoroethylene, (b) 20-46.9 mole percent perfluoromethyl perfluorovinyl ether, and (c) 0.1-2 mole percent of a cure-site monomer of the formula R 1 CH═CR 2 R 3 wherein R 1 and R 2 are independently selected from hydrogen and fluorine and R 3 is independently selected from hydrogen, fluorine and alkyl or perfluoroalkyl and wherein the cure site monomer has no more than 3 hydrogen atoms attached to the unsaturated carbon atoms.
Claim 2
Dependent Claim
104 words
A copolymer, the elastomeric vulcanizate of which is suitable for use where extraordinary resistance to environmental attack by corrosive liquids at elevated temperatures is required, comprising copolymerized units of: (a) 53-79.9 mole percent tetrafluoroethylene, (b) 20-46.9 mole percent perfluoromethyl perfluorovinyl ether, and (c) 0.1-2 mole percent of a cure-site monomer of the formula R 1 CH═CR 2 R 3 wherein R 1 and R 2 are independently selected from hydrogen and fluorine and R 3 is independently selected from hydrogen, fluorine and alkyl or perfluoroalkyl and wherein the cure site monomer has no more than 3 hydrogen atoms attached to the unsaturated carbon atoms.
Claim 3
Dependent Claim
16 words
A copolymer of claim 1 where the concentration of curesite monomer is about 0.1-1.0 mol %.
Claim 4
Dependent Claim
16 words
A copolymer of claim 1 wherein the curesite monomer has no more than 2 hydrogen atoms.
Claim 5
Dependent Claim
14 words
A copolymer of claim 1 wherein the curesite monomer consists essentially of vinylidene fluoride.
Claim 6
Dependent Claim
13 words
A copolymer of claim 1 wherein the curesite monomer consists essentially of trifluoroethylene.
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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) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |