Patent US2945775A successfully refreshed from Google Patents.
US2945775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sizing of paper with acrylamide polymers
Assignee: Dow Chemical Co
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Filing: 1955-04-18
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Granted: 1960-07-19
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Expires: 1975-04-18
Abstract
No abstract record available.
Inventors
- 👤 Freeman R Lehman
- 👤 Lloyd H Silvernail
- 👤 Elmer K Stilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:03
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN A METHOD FOR SIMULTANEOUSLY INCREASING THE RESISTANCE OF PAPER TO PENETRATION BY GREASE AND OIL AND BY WATER-BASED INKS, THE STEP OF APPLYING TO A PREFORMED PAPER PRODUCT AN AQUEOUS SOLUTION OF AN ACRYLAMIDE POLYMER, SAID POLYMER BEING CHARACTERIZED BY A VISCOSITY OF AT LEAST ABOUT 3 CENTIPOISES FOR AN AQUEOUS 0.5 PERCENT BY WEIGHT SOLUTION OF THE POLYMER IN DISTILLED WATER ADJUSTED TO A PH OF 3 TO 3.5 AND AT A TEMPERATURE OF 25*C. AND BEING EMPLOYED IN THE AMOUNT OF FROM ABOUT 0.2 TO 10 POUNDS PER TAPPI REAM AND SAID APPLIED SOLUTION COMPRISING FROM ABOUT 0.1 TO 5 PERCENT BY WEIGHT OF THE POLYMER, THE EXACT PERCENT BEING INVERSELY PROPORTIONAL TO THE VISCOSITY OF THE POLYMER.
Claim 2
Dependent Claim
121 words
IN A METHOD FOR SIMULTANEOUSLY INCREASING THE RESISTANCE OF PAPER TO PENETRATION BY GREASE AND OIL AND BY WATER-BASED INKS, THE STEP OF APPLYING TO A PREFORMED PAPER PRODUCT AN AQUEOUS SOLUTION OF AN ACRYLAMIDE POLYMER, SAID POLYMER BEING CHARACTERIZED BY A VISCOSITY OF AT LEAST ABOUT 3 CENTIPOISES FOR AN AQUEOUS 0.5 PERCENT BY WEIGHT SOLUTION OF THE POLYMER IN DISTILLED WATER ADJUSTED TO A PH OF 3 TO 3.5 AND AT A TEMPERATURE OF 25*C. AND BEING EMPLOYED IN THE AMOUNT OF FROM ABOUT 0.2 TO 10 POUNDS PER TAPPI REAM AND SAID APPLIED SOLUTION COMPRISING FROM ABOUT 0.1 TO 5 PERCENT BY WEIGHT OF THE POLYMER, THE EXACT PERCENT BEING INVERSELY PROPORTIONAL TO THE VISCOSITY OF THE POLYMER.
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) | 1963-07-19 | 1964-01-18 | 1964-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-19 | 1968-01-18 | 1968-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-19 | 1972-01-18 | 1972-07-19 | $7700.00 | Window Closed / Lapsed |