US3661815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-absorbing alkali metal carboxylate salts of starch-polyacrylonitrile graft copolymers
Assignee: Grain Processing Corp
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Filing: 1970-05-18
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Granted: 1972-05-09
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Expires: 1990-05-18
Abstract
Abstract GRANULAR, WATER-INSOLUBLE ALKALI METAL CARBOXYLATE SALTS OF STARCH-ACRYLONITRILE GRAFT COPOLYMERS WHICH ARE PRODUCED BY SAPONIFYING STARCH-ACRYLONITRILE GRAFT COPOLYMERS WITH A BASE IN AN AQUEOUS ALCOHOLIC MEDIUM.
Inventors
- 👤 Theodore Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:02
CPC Classifications
C; C08; C08F; C08F251/00; A; A23; A23B; A23B2/00; A23B2/90; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; C08B; C08B31/00; C08F8/00
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |