US3708447A
Expired / Lapsed
US
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Graft copolymers containing n-3-oxohydrocarbon-substituted acrylamide units
Assignee: Lubrizol Corp
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Filing: 1971-03-22
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Granted: 1973-01-02
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Expires: 1991-03-22
Abstract
Abstract GRAFT COPOLYMERS ARE FORMED BY REACTING A NATURALLY OCCURING POLYHYDROXY BASE POLYMER, SUCH AS CELLULOSE, WITH AN N-3-OXOHYDROCARBON-SUBSTITUTED ACRYLAMIDE SUCH AS DIACETONE ACRYLAMIDE IN THE PRESENCE OF A FREE RADICAL CATALYST, PREFERABLY A SALT OF PERIODIC ACID OR A CERIC SALT. THE GRAFTING OPERATION MODIFIES THE PROPERTIES OF THE BASE POLYMER.
Inventors
- 👤 D Hoke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:15
CPC Classifications
D; D06; D06M; D06M14/00; D06M14/02; D06M14/04
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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |