US3296109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insolubilization of cellulosic substances
Assignee: Dow Chemical Co
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Filing: 1962-09-28
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Granted: 1967-01-03
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Expires: 1982-09-28
Abstract
No abstract record available.
Inventors
- 👤 Frederick C Leavitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:04
CPC Classifications
C; C08; C08B; C08B15/00; C08B15/10; C08B15/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
IN A PROCESS FOR CROSS-LINKING WATER-SOLUBLE, NONIONIC CELLULOSE ETHERS WHICH COMPRISES SUBJECTING AN AQUEOUS SOLUTION OF SUCH A CELLULOSE ETHER TO RADIATION IN THE FORM OF HIGH ENERGY ELECTRONS, THE IMPROVEMENT WHICH CONSISTS IN PROVIDING THE CELLULOSE ETHERS TO BE IRRADIATED IN THE FORM OF AN AQUEOUS SOLUTION HAVING A VISCOISTY WITHIN THE RANGE FROM ABOUT 3 TO 500 CENTIPOISES AND IRRADIATING THE SOLUTION WITH HIGH ENERGY ELECTRONS AT A DOSE RATE OF AT LEAST 0.4X10**6 REP./SQ. CM./SEC. TO PROVIDE A TOTAL DOSE WITHIN THE RANGE FROM ABOUT 1X10**4 TO ABOUT 0.6X10**6 ROENTGEN EQUIVALENT PHYSICAL UNITS.
Claim 2
Dependent Claim
96 words
IN A PROCESS FOR CROSS-LINKING WATER-SOLUBLE, NONIONIC CELLULOSE ETHERS WHICH COMPRISES SUBJECTING AN AQUEOUS SOLUTION OF SUCH A CELLULOSE ETHER TO RADIATION IN THE FORM OF HIGH ENERGY ELECTRONS, THE IMPROVEMENT WHICH CONSISTS IN PROVIDING THE CELLULOSE ETHERS TO BE IRRADIATED IN THE FORM OF AN AQUEOUS SOLUTION HAVING A VISCOISTY WITHIN THE RANGE FROM ABOUT 3 TO 500 CENTIPOISES AND IRRADIATING THE SOLUTION WITH HIGH ENERGY ELECTRONS AT A DOSE RATE OF AT LEAST 0.4X10**6 REP./SQ. CM./SEC. TO PROVIDE A TOTAL DOSE WITHIN THE RANGE FROM ABOUT 1X10**4 TO ABOUT 0.6X10**6 ROENTGEN EQUIVALENT PHYSICAL UNITS.
References Cited (Backward Citations)
US2895891A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |