Patent US2965436A successfully refreshed from Google Patents.
US2965436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the wet strength of products obtained from cellulosic pulp
Assignee: Toulmin and Toulmin
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Filing: 1956-05-17
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Granted: 1960-12-20
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Expires: 1976-05-17
Abstract
No abstract record available.
Inventors
- 👤 Domenico Michelangelo De
- 👤 Domenico Giovan-Battista Ri De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:21
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/57; C; C07; C07D; C07D203/00; C07D203/04; C07D203/06; C07D203/16; C07D203/20; C07G; C07G99/00; C08; C08L; C08L75/00; C08L75/02; D06; D06P; D06P5/00; D06P5/22; D06P5/225
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A PROCESS FOR CHANGING AND IMPROVING THE PROPERTIES, PARTICULARLY THE WET STRENGTH, OF PRODUCTS OBTAINED FROM CELLULOSIC PULP COMPRISING THE STEPS OF (1) APPLYING TO THE SURFACE OF A CELLULOSIC PAPER CAPABLE OF IMBIDING LIQUIDS N-HYDROXYMETHYLATED 1,6-DIUREIDO-HEXANE IN A LIQUID CARRIER, (2) PERMITTING THE PAPER TO IMBIDE THE N-HYDROXYMETHYLATED 1,6-DIUREIDO-HEXANE IN A LQUID CARRIER, IN AMOUNTS CORRESPONDING TO AN INCORPORATION OF BETWEEN 0.25 AND 12% OF THE DRY PULP WEIGHT OF THE PAPER, (3) REMOVING THE EXCESS OF LIQUID FROM THE PAPER, AND (4) HEATING THE PAPER TO A TEMPERATURE BETWEEN 80130*C. FOR ABOUT 40 TO 180 SECOND AND LONGER, THEREBY INCREASING WET STRENGTH OF THE PAPER WITHOUT MATERIALLY CHANGING ITS APPEARANCE, PLIABILITY, POROSITY, FEEL AND ITS POWER OF ABSORBING WATER AND INKS.
Claim 2
Dependent Claim
123 words
A PROCESS FOR CHANGING AND IMPROVING THE PROPERTIES, PARTICULARLY THE WET STRENGTH, OF PRODUCTS OBTAINED FROM CELLULOSIC PULP COMPRISING THE STEPS OF (1) APPLYING TO THE SURFACE OF A CELLULOSIC PAPER CAPABLE OF IMBIDING LIQUIDS N-HYDROXYMETHYLATED 1,6-DIUREIDO-HEXANE IN A LIQUID CARRIER, (2) PERMITTING THE PAPER TO IMBIDE THE N-HYDROXYMETHYLATED 1,6-DIUREIDO-HEXANE IN A LQUID CARRIER, IN AMOUNTS CORRESPONDING TO AN INCORPORATION OF BETWEEN 0.25 AND 12% OF THE DRY PULP WEIGHT OF THE PAPER, (3) REMOVING THE EXCESS OF LIQUID FROM THE PAPER, AND (4) HEATING THE PAPER TO A TEMPERATURE BETWEEN 80130*C. FOR ABOUT 40 TO 180 SECOND AND LONGER, THEREBY INCREASING WET STRENGTH OF THE PAPER WITHOUT MATERIALLY CHANGING ITS APPEARANCE, PLIABILITY, POROSITY, FEEL AND ITS POWER OF ABSORBING WATER AND INKS.
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) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |