US3780000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic polymers with thioether groups
Assignee: Imperial Chemical Industries Ltd
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Filing: 1971-10-29
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Granted: 1973-12-18
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Expires: 1991-10-29
Abstract
Abstract AN AROMATIC POLYMER COMPRISING UNITS HAVING THE FORMULA -(4,4''-BIPHENYLENE)-Q-(1,4-PHENYLENE)-S- WHERE Q IS-CO-OR-SO2-AND MAY VARY FROM UNIT TO UNIT IN THE POLYMER CHAIN, EITHER ALONE OR COPOLYMERISED WITH OTHER UNITS.
Inventors
- 👤 R Feasey
- 👤 J Brewster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:29
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/0204; C08G75/0236; C08G75/024; C08G75/0227; C08G75/025; C08G75/14; C08G75/20; C08G75/23
Claims Analysis
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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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |