US4281092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vulcanizable fluorinated copolymers
Assignee: EIDP Inc
•
Filing: 1979-10-22
•
Granted: 1981-07-28
•
Expires: 1999-10-22
Abstract
Abstract Vulcanizable copolymers of tetrafluoroethylene, perfluoromethyl perfluorovinyl ether and a cyano-substituted perfluorovinyl ether such as perfluoro-(8-cyano-5-methyl-3,6-dioxa-1-octene) and perfluoro-(9-cyano-5-methyl-3,6-dioxa-1-nonene) and elastomeric vulcanizates thereof.
Inventors
- 👤 Almut F. Breazeale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:04
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/262
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
62 words
A copolymer, the elastomeric vulcanizate of which is suitable for use where extraordinary resistance to environmental attack by a temperature of 700° F. and corrosive fluids is required, comprising copolymerized units of: (a) 53-79.8 mole percent tetrafluoroethylene, (b) 20-45 mole percent perfluoromethyl perfluorovinyl ether, and (c) 0.2-2 mole percent of a cure site monomer of the formula: ##STR18## where n=1-4 and x=1-2.
Claim 2
Dependent Claim
62 words
A copolymer, the elastomeric vulcanizate of which is suitable for use where extraordinary resistance to environmental attack by a temperature of 700° F. and corrosive fluids is required, comprising copolymerized units of: (a) 53-79.8 mole percent tetrafluoroethylene, (b) 20-45 mole percent perfluoromethyl perfluorovinyl ether, and (c) 0.2-2 mole percent of a cure site monomer of the formula: ##STR18## where n=1-4 and x=1-2.
Claim 3
Dependent Claim
27 words
The copolymer of claim 1 wherein component monomer (a) comprises 64.4-72.6 mole percent, component monomer (b) comprises 27-35 mole percent, component monomer (c) comprises 0.4-1.0 mole percent.
Claim 4
Dependent Claim
19 words
The copolymers of claim 2 wherein the component monomer (c) comprises a compound of the formula: ##STR19## where n=2-3.
Claim 5
Dependent Claim
14 words
The copolymer of claim 3 wherein the component monomer (c) comprises the compound perfluoro(8-cyano-5-methyl-3,6-dioxa-1-octene).
Claim 6
Dependent Claim
31 words
The copolymer of claim 4 wherein component monomer (a) comprises about 69.3 mole percent, component monomer (b) comprises about 30 mole percent, and component monomer (c) comprises about 0.7 mole percent.
Claim 7
Dependent Claim
6 words
The vulcanized copolymer of claim 1.
Claim 8
Dependent Claim
6 words
The vulcanized copolymer of claim 2.
Claim 9
Dependent Claim
6 words
The vulcanized copolymer of claim 3.
Claim 10
Dependent Claim
6 words
The vulcanized copolymer of claim 4.
Claim 11
Dependent Claim
6 words
The vulcanized copolymer of claim 5.
References Cited (Backward Citations)
US3282875A
Cited
US3391893A
Cited
US3546186A
Cited
US3467638A
Cited
US3853721A
Cited
US3852326A
Cited
US3933767A
Cited
US3853720A
Cited
DE2504622A1
Cited
DE2635312C3
Cited
DE2638791B2
Cited
DE2651531A1
Cited
DE2659581C3
Cited
US4116888A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |