US2987433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making paper and the product thereof
Assignee: Lawrence University
•
Filing: 1955-11-10
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Granted: 1961-06-06
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Expires: 1975-11-10
Abstract
No abstract record available.
Inventors
- 👤 Jr Kyle Ward
- 👤 Jerrold A Walecka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:51
CPC Classifications
D; D21; D21H; D21H11/00; D21H11/16; D21H11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE METHOD OF MAKING IMPROVED PULP WHICH COMPRISES REPLACING THE HYDROXYL GROUPS OF CELLULOSE-CONTAINING PULP WHICH HAS BEEN SUBJECTED TO A FULL ALKALINE DIGESTION STEP TO A DEGREE OF SUBSTITUTION LESS THAN .08 WITH HYDROPHILIC RADICALS SELECTED FROM THE GROUP CONSISTING OF PHOSPHATE, HYDROXYALKYL AND CARBOXYALKYL RADICALS WHEREIN THE ALKYL CHAIN HAS LESS THAN THREE CARBON ATOMS, BY REACTING SAID CELLULOSE UNDER NON-ALKALINE CONDITIONS WITH A HYDROXYL-REPLACING AGENT, WHEREBY PULP HAVING THE FIBROUS CHARACTER OF PAPER PULP AND HAVING INCREASED STRENGTH WHEN FABRICATED INTO PAPER IS OBTAINED.
Claim 2
Independent Claim
87 words
THE METHOD OF MAKING IMPROVED PULP WHICH COMPRISES REPLACING THE HYDROXYL GROUPS OF CELLULOSE-CONTAINING PULP WHICH HAS BEEN SUBJECTED TO A FULL ALKALINE DIGESTION STEP TO A DEGREE OF SUBSTITUTION LESS THAN .08 WITH HYDROPHILIC RADICALS SELECTED FROM THE GROUP CONSISTING OF PHOSPHATE, HYDROXYALKYL AND CARBOXYALKYL RADICALS WHEREIN THE ALKYL CHAIN HAS LESS THAN THREE CARBON ATOMS, BY REACTING SAID CELLULOSE UNDER NON-ALKALINE CONDITIONS WITH A HYDROXYL-REPLACING AGENT, WHEREBY PULP HAVING THE FIBROUS CHARACTER OF PAPER PULP AND HAVING INCREASED STRENGTH WHEN FABRICATED INTO PAPER IS OBTAINED.
References Cited (Backward Citations)
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US2137343A
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US2160107A
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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) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |