Patent US3079296A successfully refreshed from Google Patents.
US3079296A
Expired / Lapsed
US
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Preparation of paper having improved wet strength
Assignee: Shell USA Inc
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Filing: 1959-12-14
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Granted: 1963-02-26
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Expires: 1979-12-14
Abstract
No abstract record available.
Inventors
- 👤 William H Houff
- 👤 Alan C Nixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:11
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/44; D21H17/45
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A PROCESS FOR PRODUCING WET STRENGTH PAPER HAVING IMPROVED PROPERTIES WHICH COMPRISES ADDING AN AQUEOUS MEDIUM CONTAINING A WATER-SOLUBLIZIED POLYMER OF ACROLEIN TO AN AQUEOUS SUSPENSION OF PAPER PULP AT THE BEATER STAGE SO AS TO FORM AN AQUEOUS MEDIUM CONTAINING 0.1% TO 5% BY WEIGHT OF THE WATER-SOLUBLIZIED POLYME BASED ON WEIGHT OF THE PAPER PULP, FORMING PAPER FROM THE RESULTING PRODUCT, AND DRYING THE FORMED PAPER, THE SAID POLYMER OF ACROLEIN BEING OBTAINED BY POLYMERIZATION THROUGH THE CARBON-TO-CARBON DOUBLE BOND OF ACROLEIN, HAVING AN INTRINSIC VISCOSITY OF AT LEAST 0.5 AND POSSESSING WHEN PREPARED AT LEAST 95% OF THE THEORETICAL ALDEHYDE FUNCTION AS DETERMINDE BY ADDITION OF HYDROXYLAMINE HYDROCHLORIDE AND TITRATING WITH KARL FISCHER REAGENT THE LIBERATED WATER, THE EXPRESSION THEORETICAL ALDEHYDE AS USED ABOVE MEANING ONE ALDEHYDE GROUP PER UNIT OF ACROLEIN IN THE POLYMER.
Claim 2
Dependent Claim
138 words
A PROCESS FOR PRODUCING WET STRENGTH PAPER HAVING IMPROVED PROPERTIES WHICH COMPRISES ADDING AN AQUEOUS MEDIUM CONTAINING A WATER-SOLUBLIZIED POLYMER OF ACROLEIN TO AN AQUEOUS SUSPENSION OF PAPER PULP AT THE BEATER STAGE SO AS TO FORM AN AQUEOUS MEDIUM CONTAINING 0.1% TO 5% BY WEIGHT OF THE WATER-SOLUBLIZIED POLYME BASED ON WEIGHT OF THE PAPER PULP, FORMING PAPER FROM THE RESULTING PRODUCT, AND DRYING THE FORMED PAPER, THE SAID POLYMER OF ACROLEIN BEING OBTAINED BY POLYMERIZATION THROUGH THE CARBON-TO-CARBON DOUBLE BOND OF ACROLEIN, HAVING AN INTRINSIC VISCOSITY OF AT LEAST 0.5 AND POSSESSING WHEN PREPARED AT LEAST 95% OF THE THEORETICAL ALDEHYDE FUNCTION AS DETERMINDE BY ADDITION OF HYDROXYLAMINE HYDROCHLORIDE AND TITRATING WITH KARL FISCHER REAGENT THE LIBERATED WATER, THE EXPRESSION THEORETICAL ALDEHYDE AS USED ABOVE MEANING ONE ALDEHYDE GROUP PER UNIT OF ACROLEIN IN THE POLYMER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-02-25 | 1966-08-27 | 1967-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-25 | 1970-08-27 | 1971-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-25 | 1974-08-27 | 1975-02-26 | $7700.00 | Window Closed / Lapsed |