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US3017291A
Expired / Lapsed
US
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Wet-strength paper and method of producing same
Assignee: Rohm and Haas Co
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Filing: 1959-01-06
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Granted: 1962-01-16
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Expires: 1979-01-06
Abstract
No abstract record available.
Inventors
- 👤 Paul J Mclaughlin
- 👤 Walter W Toy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:47
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/42; D21H17/43; Y; Y10; Y10T; Y10T428/00; Y10T428/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
192 words
A METHOD FOR PRODUCING A WET-STRENGTH PAPER WHICH COMPRISES IMPREGNATING THHROUGHOUT ITS MASS A SUBSTANTIALLY DRY PAPER PREPARED FROM CELLULOSE FIBERS BEATEN TO A CANADIAN FREENESS BETWEEN 260 AND 455 CC. AND HAVING A BASIS WEIGHT OF 10 TO 65 LBS. PER REAM OF 500 SHEETS HAVING A SIZE OF 24" BY 36" WITH AN AQUEOUS DISPERSION CONTAINING 2 TO 32% BY WEIGHT OF A WATER-INSOLUBLE COPOLYMER OF 3 TO 10% BY WEIGHT OF UNITS OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF MALEIC ACID, ACONITIC ACID, AND SALTS AND ANHYDRIDES THEREOF, AND AT LEAST ONE OTHER COMONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLONITRILE, VINYLTOLUENE, ESTERS OFACRYLIC ACID, AND ESTERS OF METHACRYLIC ACID, SAID DISPERSION BEING OF LOW VISCOSITY, HAVING A TOTAL SOLIDS CONTENT NOT OVER ABOUT 36% BY WEIGHT, AND THE AMOUNT OF COPOLYMER THEREIN BEING AT LEAST ABOUT 85% BY WEIGHT OF THE TOTAL SOLIDS CONTENT OF THE DISPERSION, DRYING THE IMPREGNATED PAPER AND HEATING THE IMPREGNATED PAPER AT A TEMPERATURE OF 240*F. TO 450* F. FOR A PERIOD RANGING FROM ABOUT 2 TO 5 MINUTES AT THE HIGHER TEMPERATURE TO ABOUT 30 MINUTES AT THE LOWER TEMPERATURE.
Claim 2
Independent Claim
192 words
A METHOD FOR PRODUCING A WET-STRENGTH PAPER WHICH COMPRISES IMPREGNATING THHROUGHOUT ITS MASS A SUBSTANTIALLY DRY PAPER PREPARED FROM CELLULOSE FIBERS BEATEN TO A CANADIAN FREENESS BETWEEN 260 AND 455 CC. AND HAVING A BASIS WEIGHT OF 10 TO 65 LBS. PER REAM OF 500 SHEETS HAVING A SIZE OF 24" BY 36" WITH AN AQUEOUS DISPERSION CONTAINING 2 TO 32% BY WEIGHT OF A WATER-INSOLUBLE COPOLYMER OF 3 TO 10% BY WEIGHT OF UNITS OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF MALEIC ACID, ACONITIC ACID, AND SALTS AND ANHYDRIDES THEREOF, AND AT LEAST ONE OTHER COMONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLONITRILE, VINYLTOLUENE, ESTERS OFACRYLIC ACID, AND ESTERS OF METHACRYLIC ACID, SAID DISPERSION BEING OF LOW VISCOSITY, HAVING A TOTAL SOLIDS CONTENT NOT OVER ABOUT 36% BY WEIGHT, AND THE AMOUNT OF COPOLYMER THEREIN BEING AT LEAST ABOUT 85% BY WEIGHT OF THE TOTAL SOLIDS CONTENT OF THE DISPERSION, DRYING THE IMPREGNATED PAPER AND HEATING THE IMPREGNATED PAPER AT A TEMPERATURE OF 240*F. TO 450* F. FOR A PERIOD RANGING FROM ABOUT 2 TO 5 MINUTES AT THE HIGHER TEMPERATURE TO ABOUT 30 MINUTES AT THE LOWER TEMPERATURE.
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) | 1965-01-15 | 1965-07-17 | 1966-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-15 | 1969-07-17 | 1970-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-15 | 1973-07-17 | 1974-01-16 | $7700.00 | Window Closed / Lapsed |