US3770699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bis(polyphenylene ether)-sulfone block copolymers
Assignee: Individual
•
Filing: 1972-02-02
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Granted: 1973-11-06
•
Expires: 1992-02-02
Abstract
Abstract THE INVENTION RELATES TO BLOCK POLYMERS OF THE A-B-A TYPE WHERE EACH A IS THE PHENOXY RESIDUE OF A POLY(2,6-DISUBSTITUTED-1,4-PHENYLENE OXIDE) HAVING ONE TERMINAL HYDROXYL PER POLYMER MOLECULE AND B IS THE RESIDUE OF A COMPOUND HAVING TWO GROUPS WHICH ARE REACTIVE WITH THE HYDROXYL GROUP OF SAID POLY(PHENYLENE OXIDE). THESE COMPOSITIONS ARE USEFUL IN PRODUCING MOLDED ARTICLES, FILMS, FIBERS, ETC., HAVING MODIFIED PROPERTIES COMPARED TO THE PARENT POLY(PHENYLENE OXIDES).
Inventors
- 👤 D White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:29
CPC Classifications
C; C08; C08G; C08G81/00; C08G63/00; C08G63/66; C08G63/668; C08G64/00; C08G64/18; C08G64/183; C08L; C08L67/00
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |