US3663490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylic acid-acrylamide-diacetone acrylamide terpolymer
Assignee: Union Oil Company of California
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Filing: 1969-07-28
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Granted: 1972-05-16
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Expires: 1989-07-28
Abstract
Abstract A NOVEL WATER-SOLUBLE TERPOLYMER OF ACRYLIC ACID, ACRYLAMIDE AND DIACETONE ACRYLAMIDE USEFUL AS A FLOOD WATER ADDITIVE AND A METHOD FOR PREPARING THE POLYMER IN WHICH THE MONOMERS ARE COPOLYMERIZED IN THE PREENCE OF AN ORGANOBORON CATALYST.
Inventors
- 👤 Amir M Sarem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:39
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/588; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/62
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |