US3579475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linked poly(arylsulphone ethers)
Assignee: Individual
•
Filing: 1970-02-17
•
Granted: 1971-05-18
•
Expires: 1990-02-17
Abstract
Abstract A THERMOPLASTIC POLYMER CONTAINING AROMATIC RESIDUES IN THE POLYMER CHAIN IS CROSS-LINKED BY HEATING WITH AN AROMATIC COMPOUND CONTAINING AT LEAST TWO SULPHONYL CHLORIDE, BROMIDE, HYDRAZIDE OR ESTER GROUPS. THE THERMOPLASTIC POLYMER MAY ITSELF CONTAIN AT LEAST TWO OF THESE REACTIVE SULPHONYL GROUPS PER CHAIN AND CAN BE CROSSLINKED ON HEATING ALONE.
Inventors
- 👤 Michael Edward Benet Jones
- 👤 Brian Edmund Jennings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:27
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20; C08K; C08K5/00; C08K5/36; C08K5/41; C08K5/42; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |