US3377302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Saponified starch acrylate grafts
Assignee: United States Department of Agriculture
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Filing: 1966-01-18
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Granted: 1968-04-09
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Expires: 1986-01-18
Abstract
No abstract record available.
Inventors
- 👤 Lewis A Gugliemelli
- 👤 Weaver Mary Ollidene
- 👤 Charles R Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:51
CPC Classifications
C; C08; C08B; C08B31/00; C08F; C08F251/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
WATER DISPERSIBLE THICKENING AGENTS PREPARED BY REACTING AN AQUEOUS DISPERSION OF A CERIC-INDUCED GRAFT COPOLYMER CONSISTING OF STARCH AND FROM 1 TO 2 PARTS BASED ON THE WEIGHT OF THE STARCH OF CHEMICALLY BONDED POLY METHYLACRYLATE SIDE CHAINS HAVING AN AVERAGE D.S. PER STARCH AGU OF 0.000056-0.000091 FOR ABOUT 2 HOURS AT ABOUT 80*C. WITH AN AQUEOUS SOLUTION CONTAINING 0.5-1.5 PARTS BY WEIGHT OF KOH BASED ON THE WEIGHT OF GRAFT COPOLYMER WHEREBY TO CONVERT THE ESTER FUNCTION OF THE POLYMETHYLACRYLATE SIDE CHAINS TO THE CARBOXYLIC ACID ALKALI METAL SALT.
Claim 2
Dependent Claim
90 words
WATER DISPERSIBLE THICKENING AGENTS PREPARED BY REACTING AN AQUEOUS DISPERSION OF A CERIC-INDUCED GRAFT COPOLYMER CONSISTING OF STARCH AND FROM 1 TO 2 PARTS BASED ON THE WEIGHT OF THE STARCH OF CHEMICALLY BONDED POLY METHYLACRYLATE SIDE CHAINS HAVING AN AVERAGE D.S. PER STARCH AGU OF 0.000056-0.000091 FOR ABOUT 2 HOURS AT ABOUT 80*C. WITH AN AQUEOUS SOLUTION CONTAINING 0.5-1.5 PARTS BY WEIGHT OF KOH BASED ON THE WEIGHT OF GRAFT COPOLYMER WHEREBY TO CONVERT THE ESTER FUNCTION OF THE POLYMETHYLACRYLATE SIDE CHAINS TO THE CARBOXYLIC ACID ALKALI METAL SALT.
References Cited (Backward Citations)
US3061472A
Cited
US3061471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |