US3557067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linked vinylidene/dicarboxylic acid anhydride copolymers
Assignee: Imperial Chemical Industries Ltd
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Filing: 1968-11-07
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Granted: 1971-01-19
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Expires: 1988-11-07
Abstract
Abstract CROSS-LINKING OF VINYLIDENE/DICARBOXYLIC ACID ANHYDRIDE COPOLYMERS IS ACHIEVED USING ORGANIC ESTER OR ETHER CONTAINING A VINYLIDENE GROUP AND AN ALCOHOLIC HYDROXYL GROUP OR AN ETHYNYL GROUP. THE REACTION IS PREFERABLY CARRIED OUT IN THE PRESENCE OF A FREE RADICAL CATALYST AND THE PRODUCTS ARE SALTS WHICH ARE WATER-SOLUBLE OR SATER-SWELLABLE.
Inventors
- 👤 Ernest Bingham Burns
- 👤 Brian Benjamin Darlow
- 👤 Robert Victor Smallman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:27
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/14; C08; C08F; C08F22/00; C08F22/04; C08F8/00; C08F8/44
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |