Patent US4536352A successfully refreshed from Google Patents.
US4536352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfluoro vinyl ethers
Assignee: Asahi Kasei Corp
•
Filing: 1981-12-14
•
Granted: 1985-08-20
•
Expires: 2001-12-14
Abstract
Abstract A novel fluorinated copolymer is prepared by copolymerization of a fluorinated olefin with a novel sulfur containing fluorinated vinylether of the formula: ##STR1## wherein k is 0 or 1 and l is an integer of 3 to 5, which is prepared from starting materials which are also novel. Said copolymer is useful for preparation of a fluorinated cation exchange membrane having carboxylic acid groups and/or sulfonic acid groups which can be used advantageously in electrolysis of an aqueous alkali metal halide solution with improved electrolysis performance.
Inventors
- 👤 Kyoji Kimoto
- 👤 Hirotsugu Miyauchi
- 👤 Jukichi Ohmura
- 👤 Mikio Ebisawa
- 👤 Toshioki Hane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:44
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/78; C07C309/79; C07C309/82; C07C309/84; C07C317/00; C07C317/16; C07C317/18; C07C323/00; C07C323/10; C07C323/11; C07C323/12; C07D; C07D327/00; C07D327/02; C07D327/04; C08; C08F; C08F214/00; C08F214/02; C08F214/04; C08F214/08; C08F214/18; C08F214/184; C08F214/26; C08F214/262; C08F216/00; C08F216/12; C08F216/14; C08F216/1466; C08F216/1475; C08F8/00; C08F8/04; C08F8/12; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2237; C25; C25B; C25B13/00; C25B13/04; C25B13/08; C08J2327/00; C08J2327/02; C08J2327/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
23 words
A fluorinated vinyl ether compound represented by the formula: ##STR61## wherein n is 2 and p' is an integer of 0 to 1.
Claim 2
Dependent Claim
23 words
A fluorinated vinyl ether compound represented by the formula: ##STR61## wherein n is 2 and p' is an integer of 0 to 1.
Claim 3
Dependent Claim
10 words
A compound according to claim 1, wherein p' is 0.
References Cited (Backward Citations)
GB1497748A
Cited
JPS5223192A
Cited
JPS5228588A
Cited
JPS5236589A
Cited
JPS51126398A
Cited
US4151653A
Cited
JPS53104583A
Cited
JPS53116287A
Cited
JPS53132089A
Cited
JPS546887A
Cited
US4176215A
Cited
US4275226A
Cited
US4348310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |