Patent US3949947A successfully refreshed from Google Patents.
Patent US3072635A successfully refreshed from Google Patents.
US3072635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Readily dissolving cellulose derivatives and process therefor
Assignee: Chemical Dev of Canada Ltd
•
Filing: 1959-11-04
•
Granted: 1963-01-08
•
Expires: 1979-11-04
Abstract
No abstract record available.
Inventors
- 👤 Menkart John Hanus
- 👤 Allan Ronald Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:10
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/10; C08B11/12; C08B11/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
64 words
A METHOD FOR RENDERING A SOLID, WATER-SOLUBLE CELLULOSE ETHER SELECTED FROM THE GROUP CONSISTING OF ALKYL ETHERS OF CELLULOSE, HYDROXYALKYL ETHERS OF CELLULOSE AND CARBOXYALKYL ETHERS OF CELLULOSE MORE DISPERSIBLE AND SOLUBLE IN WATER, WHICH COMPRISES,TREATING AND REACTING SAID SOLID CELLULOSE ETHER IN PARTICULATE FORM WITH GLYOXAL IN AN AMOUNT FROM ABOUT 0.005% TO ABOUT 5% BASED ON THE WEIGHT OF SAID CELLULOSE ETHER.
References Cited (Backward Citations)
US2879268A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |