US4009149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amorphous thermoplastic aromatic polysulphone
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1973-01-17
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Granted: 1977-02-22
•
Expires: 1993-01-17
Abstract
Abstract A novel amorphous thermoplastic aromatic polysulphone is provided consisting of repeating units having the formula ##STR1##
Inventors
- 👤 Terence King
- 👤 John Brewster Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:18
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20; C08G75/23
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
An amorphous thermoplastic aromatic polysulphone consisting of repeating units having the formula ##STR7## and having a Tg of about 260° C.
Claim 2
Dependent Claim
21 words
An amorphous thermoplastic aromatic polysulphone consisting of repeating units having the formula ##STR7## and having a Tg of about 260° C.
References Cited (Backward Citations)
US3332909A
Cited
US3647751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-22 | 1980-08-23 | 1981-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-22 | 1984-08-23 | 1985-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-22 | 1988-08-23 | 1989-02-22 | $7700.00 | Window Closed / Lapsed |