Patent US3723386A successfully refreshed from Google Patents.
US3723386A
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Polymers from hydroxyarylmethylenesulfonium zwitterions
Assignee: Dow Chemical Co
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Filing: 1971-03-29
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Granted: 1973-03-27
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Expires: 1991-03-29
Abstract
Abstract HYDROXYARYLPOLYMETHYLENESULFONIUM SALTS OF FORMULA 1, PREPARED BY CONDENSATION OF A PHENOL AND A POLYMETHYLENESULFIDE, CAN BE CONVERTED INTO A SULFONIUM HYDROXIDE INNER SALT II AND THEN THERMALLY POLYMERIZED TO YIELD POLYMERS CONTAINING A PLURALITY OF GROUPS OF FORMULA III: (4-(HO-),R,R'',R"-PHENYL)-S+<(-CH2-A-(B)N-CH2-) X(-) I (4-(-O+),R,R'',R"-PHENYL)-S<(-CH2-A-(B)N-CH2-) II (-O-(R,R'',R"-PHENYLENE)-S-CH2-A-(B)N-CH2-) III THESE POLYMERS AND COPOLYMERS ARE USEFUL WATER RESISTANT THERMOPLASTIC RESINS AND IMPREGNANTS.
Inventors
- 👤 M Hatch
- 👤 M Yoshimine
- 👤 H Smith
- 👤 D Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:07
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/12; C07; C07D; C07D333/00; C07D333/02; C07D333/46; C08G75/02; C08G75/06
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |