US2762270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of sizing paper with an aqueous emulsion of ketene dimer
Assignee: Hercules Powder Co
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Filing: 1949-10-06
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Granted: 1956-09-11
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Expires: 1969-10-06
Abstract
No abstract record available.
Inventors
- 👤 Gerald I Keim
- 👤 Thompson William Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:44
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A PROCESS FOR SIZING PAPER COMPRISING FORMING A WEB OF CELLULOSIC FIBERS, IMPREGNATING SAID WEB WITH AN AQUEOUS EMULSION HAVING IN THE DISPERSED PHASE A DIMER OF A HIGHER ORGANIC KETENE SO THAT FROM 0.01 TO 1.0%, BASED ON THE WEIGHT OF THE FIBERS, OF SAID DIMER IS RETAINED ON THE WEB, SAID KETENE HAVING AT LEAST 6 CARBON ATOMS AND HAVING ATTACHED TO THE >C=C=O GROUP ONLY MEMBERS OF THE CLASS CONSISTING OF HYDROGEN AND HYDROCARBON RADICALS, AND REACTING SAID DIMER WITH THE CELLULOSE FIBERS WHEREBY SIZING IS IMPARTED TO THE PAPER.
Claim 2
Dependent Claim
93 words
A PROCESS FOR SIZING PAPER COMPRISING FORMING A WEB OF CELLULOSIC FIBERS, IMPREGNATING SAID WEB WITH AN AQUEOUS EMULSION HAVING IN THE DISPERSED PHASE A DIMER OF A HIGHER ORGANIC KETENE SO THAT FROM 0.01 TO 1.0%, BASED ON THE WEIGHT OF THE FIBERS, OF SAID DIMER IS RETAINED ON THE WEB, SAID KETENE HAVING AT LEAST 6 CARBON ATOMS AND HAVING ATTACHED TO THE >C=C=O GROUP ONLY MEMBERS OF THE CLASS CONSISTING OF HYDROGEN AND HYDROCARBON RADICALS, AND REACTING SAID DIMER WITH THE CELLULOSE FIBERS WHEREBY SIZING IS IMPARTED TO THE PAPER.
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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) | 1959-09-11 | 1960-03-12 | 1960-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-11 | 1964-03-12 | 1964-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-11 | 1968-03-12 | 1968-09-11 | $7700.00 | Window Closed / Lapsed |