Patent US3296248A successfully refreshed from Google Patents.
US3296248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of oxidative aging of hydroxyethylcellulose
Assignee: Rayonier Inc
•
Filing: 1962-04-19
•
Granted: 1967-01-03
•
Expires: 1982-04-19
Abstract
No abstract record available.
Inventors
- 👤 Mitchell Reid Logan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:33
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20; C08B11/02; C08B11/04; C08B11/08; D; D01; D01F; D01F2/00; D01F2/06; D01F2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
IN THE PRODUCTION OF HYDROXYETHYLCELLULOSE IN WHICH CELLULOSE IS CONVERTED TO ALKALI CELLULOSE AND REACTED WITH ETHYLENE OXIDE TO FORM HYDROXYETHYLCELLULOSE HAVING FROM 2 % TO 8% OF SUBSTITUTED ETHYLENE OXIDE, THE IMPROVEMENT IN AGIN THE HYDROXYETHYLCELLULOSE TO LOWER THE D.P. WHICH COMPRISES SUBJECTING THE HYDROXYETHYLCELLULOSE TO OXIDATIVE AGING FROM ABOUT 10 MINUTES TO 24 HOURS AT A TEMPERATURE OF FROM 30* TO 60* C. IN AN OXYGEN-CONTAINING GAS AND IN CONTACT WITH A WATER SOLUBLE SALT OF A METAL OF THE GROUP CONSISTING OF COBALT AND MANGANESE IN AN AMOUNT SUFFICIENT TO PROVIDE FROM 0.2 TO 3 P.P.M. OF COBALT AND 1 TO 25 P.P.M. OF MANGANESE BASED ON THE BONE DRY WEIGHT OF THE HYDROXYETHYLCELLULOSE.
Claim 2
Dependent Claim
117 words
IN THE PRODUCTION OF HYDROXYETHYLCELLULOSE IN WHICH CELLULOSE IS CONVERTED TO ALKALI CELLULOSE AND REACTED WITH ETHYLENE OXIDE TO FORM HYDROXYETHYLCELLULOSE HAVING FROM 2 % TO 8% OF SUBSTITUTED ETHYLENE OXIDE, THE IMPROVEMENT IN AGIN THE HYDROXYETHYLCELLULOSE TO LOWER THE D.P. WHICH COMPRISES SUBJECTING THE HYDROXYETHYLCELLULOSE TO OXIDATIVE AGING FROM ABOUT 10 MINUTES TO 24 HOURS AT A TEMPERATURE OF FROM 30* TO 60* C. IN AN OXYGEN-CONTAINING GAS AND IN CONTACT WITH A WATER SOLUBLE SALT OF A METAL OF THE GROUP CONSISTING OF COBALT AND MANGANESE IN AN AMOUNT SUFFICIENT TO PROVIDE FROM 0.2 TO 3 P.P.M. OF COBALT AND 1 TO 25 P.P.M. OF MANGANESE BASED ON THE BONE DRY WEIGHT OF THE HYDROXYETHYLCELLULOSE.
References Cited (Backward Citations)
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 |