US2757086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of wet-strengthening paper with high molecular weight ureaformaldehyde resins
Assignee: Brown Co
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Filing: 1950-08-19
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Granted: 1956-07-31
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Expires: 1970-08-19
Abstract
No abstract record available.
Inventors
- 👤 Erwin E Morse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:54
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/49; D21H17/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
IN PROCESSES FOR WET-STRENGTHENING PAPER BY THE ADDITION OF A WATER-SOLUBLE UREAFORMALDEHYDE RESIN CONDENSATION PRODUCT TO THE PAPER-MAKING STOCK PRIOR TO FORMATION THEREOF INTO PAPER, THE METHOD OF REDUCING LOSS OF SAID RESIN TO THE WHITE WATER, THEREBY IMPROVING THE RETENTION OF THE RESIN IN THE PAPER, COMPRISING REMOVING FROM THE WATER-SOLUBLE CONDENSATION PRODUCT, PRIOR TO THE ADDITION THEREOF TO THE PAPER MAKING STOCK, BY SOLVENT FRACTIONATION FROM AN AQUEOUS SOLUTION OF SAID PRODUCT LOWER MOLECULAR WEIGHT COMPONENTS COMPRISING AT LEAST 10% OF THE TOTAL RESIN SOLIDS TO PROVIDE A WATER-SOLUBLE RESIN FRACTION HAVING A HIGHER AVERAGE MOLECULAR WEIGHT THAN SAID ORIGINAL PRODUCT.
Claim 2
Dependent Claim
103 words
IN PROCESSES FOR WET-STRENGTHENING PAPER BY THE ADDITION OF A WATER-SOLUBLE UREAFORMALDEHYDE RESIN CONDENSATION PRODUCT TO THE PAPER-MAKING STOCK PRIOR TO FORMATION THEREOF INTO PAPER, THE METHOD OF REDUCING LOSS OF SAID RESIN TO THE WHITE WATER, THEREBY IMPROVING THE RETENTION OF THE RESIN IN THE PAPER, COMPRISING REMOVING FROM THE WATER-SOLUBLE CONDENSATION PRODUCT, PRIOR TO THE ADDITION THEREOF TO THE PAPER MAKING STOCK, BY SOLVENT FRACTIONATION FROM AN AQUEOUS SOLUTION OF SAID PRODUCT LOWER MOLECULAR WEIGHT COMPONENTS COMPRISING AT LEAST 10% OF THE TOTAL RESIN SOLIDS TO PROVIDE A WATER-SOLUBLE RESIN FRACTION HAVING A HIGHER AVERAGE MOLECULAR WEIGHT THAN SAID ORIGINAL PRODUCT.
References Cited (Backward Citations)
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US2325302A
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US2338602A
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Cited
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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) | 1959-07-31 | 1960-01-30 | 1960-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-31 | 1964-01-30 | 1964-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-31 | 1968-01-30 | 1968-07-31 | $7700.00 | Window Closed / Lapsed |