US3723375A
Expired / Lapsed
US
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Novel anhydride interpolymers
Assignee: GAF Chemicals Corp
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Filing: 1970-11-24
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Granted: 1973-03-27
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Expires: 1990-11-24
Abstract
Abstract ANHYDRIDE INTERPOLYMERS AND THEIR WATER-SOLUBLE DERIVATIVES COMPRISING MALEIC ANHYDRIDE AND VINYL MONOMERS OF TWO DIFFERENT CLASSES, ONE CLASS BEING STYRENE, THE OTHER CLASS BEING REPRESENTED BY THE STRUCTURAL FORMULA R1-X-(Y-)C=CH2 WHEREIN R1 IS AN ORGANIC RADICAL CONTAINING C6 TO C36 CARBON ATOMS, Y IS HYDROGEN, HALOGEN, ALKYL OR PHENYL AND X IS OXYGEN, SULPHUR, CARBOXY, CARBONAMIDO OR A CHEMICAL BOND; SAID ANHYDRIDE INTERPOLYMERS BEING VERY USEFUL AS THICKENING AGENTS FOR SOLUTIONS OF HIGH IONIC STRENGTH.
Inventors
- 👤 N Field
- 👤 E Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:29
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/81; A61K8/8164; A61Q; A61Q19/00; A61Q5/00; A61Q5/02; C; C05; C05C; C05C3/00; C08; C08F; C08F22/00; C08F22/04; C08F8/00; C09; C09D; C09D9/00
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |