Patent US3834984A successfully refreshed from Google Patents.
US3834984A
Expired / Lapsed
US
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Method of incorporating water soluble epoxypropyl starch into paper
Assignee: United States Department of Agriculture
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Filing: 1973-08-09
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Granted: 1974-09-10
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Expires: 1993-08-09
Abstract
Abstract A PROCESS IS DISCLOSED FOR PREPARING PAPER HAVING INCORPORATED THEREIN AN EPOXYPROPYL STARCH. AT EPOXYPROPYL D.S. OF UP TO .09 THE COMPOUNDS ARE WATER SOLUBLE AND INCREASE BOTH WET AND DRY STRENGTH OF PAPER AT A 1-PERCENT LEVEL OF ADDITION.
Inventors
- 👤 R Wing
- 👤 W Doane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:20
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/08; C08B31/12; D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |