Patent US3631222A successfully refreshed from Google Patents.
US3631222A
Expired / Lapsed
US
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Polyarylsulfone graft and block copolymers with chains of polyamide acid or polyimide
Assignee: 3M Co
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Filing: 1970-01-02
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Granted: 1971-12-28
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Expires: 1990-01-02
Abstract
Abstract CERTAIN LINEAR THERMOPLASTIC POLYARYLSULFONES HAVING REACTIVE GROUPS THEREON ARE DISCLOSED. THE REACTIVE GROUPS CAN RECUR ALONG THE POLYMER CHAINS AND/OR CAN OCCUR AT THE ENDS OF THE CHAINS. IN ADDITION, SEGMENTED (GRAFT AND BLOCK) COPOLYMERS CONTAINING POLYARYLSULFONE SEGMENTS ARE DISCLOSED. THE LINEAR AND SEGMENTED POLYMERS HAVE WIDE AREAS OF UTILITY, E.G. IN COATINGS, IMPREGNANTS, FILMS, FILAMENTS, MOLDED ARTICLES, ETC.
Inventors
- 👤 Herward A Vogel
- 👤 Hans T Oien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:09
CPC Classifications
C; C08; C08G; C08G81/00; C08G75/00; C08G75/20; Y; Y10; Y10S; Y10S525/00; Y10S525/906
Claims Analysis
Total Claims: 0
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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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |