Patent US3636052A successfully refreshed from Google Patents.
US3636052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxyarylpolymethylenesulfonium zwitterions
Assignee: Dow Chemical Co
•
Filing: 1969-10-15
•
Granted: 1972-01-18
•
Expires: 1989-10-15
Abstract
Abstract HYDROXYARYLPOLYMETHYLENESULFONIUM SALTS OF FORMULA I, PREPARED BY CONDENSATION OF A PHENOL AND A POLYMETHYLEMESULFIDE, CAN BE CONVERTED INTO A SULFONIUM HYDROXIDE INNER SALT II AND THEN THERMALLY POLYMERIZED TO YEILD POLYMERS CONTAINING A PLURALITY OF GROUPS OF FORMULA III: (HO-),R,R'',R",((-CH2-A-(B)A-CH2-)>S(+)-)BENZENE X(-) (I) (((-CH2-A-(B)A-CH2-)>S(+)-),R,R'',R"-PHENYLENE)-O(-) (II) -(O-(R,R'',R"-PHENYLENE)-S-CH2-A-(B)A-CH2)- (III) THESE POLYMERS AND COPOLYMERS ARE USEFUL WATER RESISTANT THERMOPLASTIC RESINS AND IMPREGNANTS.
Inventors
- 👤 Melvin J Hatch
- 👤 Masao Yoshimine
- 👤 Hugh B Smith
- 👤 Donald L Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:58
CPC Classifications
C; C07; C07D; C07D333/00; C07D333/02; C07D333/46; C07D333/50; C07D333/72; C08; C08G; C08G75/00; C08G75/02; C08G75/06; C08G75/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |