Patent US2816092A successfully refreshed from Google Patents.
US2816092A
Expired / Lapsed
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Method of drying improved cationic urea-formaldehyde resins
Assignee: Hercules Powder Co
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Filing: 1953-11-17
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Granted: 1957-12-10
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Expires: 1973-11-17
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:49
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/043; C08G12/046
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A PROCESS FOR DRYING AN AQUEOUS SLUDGE OBTAINED BY HEATING AN AQUEOUS SOLUTION OF A CATIONIC UREAFORMALDEHYDE-POLYFUNCTIONAL ORGANIC NITROGEN BASE RESIN TO PRECIPITATE A FRACTION THEREFROM OF EXCEPTIONAL UTILITY IN PRODUCING WET STRENGTH PAPER, SAID FRACTION BEING CHARACTERIZED BY BEING SUBSTANTIALLY COMPLETELY RETAINED BY THE PAPER WHEN ADDED TO WATER SUSPENSION OF PAPER FIBERS. WHICH COMPRISES ADDING TO SAID AQUEOUS SLUDGE FROM ABOUT 4 TO ABOUT 100 PARTS BY WEIGHT, BASED ON THE TOTAL WEIGHT OF THE AQUEOUS SLUDGE AS 1 PART, OF AN ORGANIC LIQUID SELECTED FROM THE GROUP CONSISTING OF SUBSTANTIALLY COMPLETELY WATER-MISCIBLE ETHERS KETONES AND MONOHYDRIC ALCOHOLS CONCENTRATING THE RESULTING DISPERSIONS AND DRYING THE RESIN.
Claim 2
Dependent Claim
108 words
A PROCESS FOR DRYING AN AQUEOUS SLUDGE OBTAINED BY HEATING AN AQUEOUS SOLUTION OF A CATIONIC UREAFORMALDEHYDE-POLYFUNCTIONAL ORGANIC NITROGEN BASE RESIN TO PRECIPITATE A FRACTION THEREFROM OF EXCEPTIONAL UTILITY IN PRODUCING WET STRENGTH PAPER, SAID FRACTION BEING CHARACTERIZED BY BEING SUBSTANTIALLY COMPLETELY RETAINED BY THE PAPER WHEN ADDED TO WATER SUSPENSION OF PAPER FIBERS. WHICH COMPRISES ADDING TO SAID AQUEOUS SLUDGE FROM ABOUT 4 TO ABOUT 100 PARTS BY WEIGHT, BASED ON THE TOTAL WEIGHT OF THE AQUEOUS SLUDGE AS 1 PART, OF AN ORGANIC LIQUID SELECTED FROM THE GROUP CONSISTING OF SUBSTANTIALLY COMPLETELY WATER-MISCIBLE ETHERS KETONES AND MONOHYDRIC ALCOHOLS CONCENTRATING THE RESULTING DISPERSIONS AND DRYING THE RESIN.
References Cited (Backward Citations)
US1836553A
Cited
US2554475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-09 | 1961-06-10 | 1961-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-09 | 1965-06-10 | 1965-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-09 | 1969-06-10 | 1969-12-10 | $7700.00 | Window Closed / Lapsed |