Patent US3069409A successfully refreshed from Google Patents.
US3069409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing carboxyalkyl cellulose ethers
Assignee: Hercules Powder Co
•
Filing: 1958-06-12
•
Granted: 1962-12-18
•
Expires: 1978-06-12
Abstract
No abstract record available.
Inventors
- 👤 John E Henry
- 👤 George A Reasor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:50
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/10; C08B11/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
THE PROCESS OF PREPARING CARBOXYALKYL ETHERS OF CELLULOSE WHICH COMPRISES AGITATING CELLULOSE, FREE ALKALI, WATER AND AN ETHERIFYING AGENT SELECTED FROM THE GROUP CONSISTING OF HALOGENATED LOWER FATTY ACIDS AND ALKALI METAL SALTS THEREOF IN A LIQUID DILUENT SELECTED FROM THE GROUP CONSISTING OF THOSE DILUENTS TABULATED HEREINBELOW, THE RATIO OF WATER TO CELLULOSE BEING AS SHOWN IN SAID TABULATION, THE RESULTING ETHER PRODUCT REMAINING IN A SOLID UNDISSOLVED STATE IN THE REACTION MIXTURE UNTIL RECOVERED, SAID CELLULOSE BEING SLURRIED IN SAID DILUENT THROUGHOUT THE ETHERIFICATION:
Claim 2
Dependent Claim
86 words
THE PROCESS OF PREPARING CARBOXYALKYL ETHERS OF CELLULOSE WHICH COMPRISES AGITATING CELLULOSE, FREE ALKALI, WATER AND AN ETHERIFYING AGENT SELECTED FROM THE GROUP CONSISTING OF HALOGENATED LOWER FATTY ACIDS AND ALKALI METAL SALTS THEREOF IN A LIQUID DILUENT SELECTED FROM THE GROUP CONSISTING OF THOSE DILUENTS TABULATED HEREINBELOW, THE RATIO OF WATER TO CELLULOSE BEING AS SHOWN IN SAID TABULATION, THE RESULTING ETHER PRODUCT REMAINING IN A SOLID UNDISSOLVED STATE IN THE REACTION MIXTURE UNTIL RECOVERED, SAID CELLULOSE BEING SLURRIED IN SAID DILUENT THROUGHOUT THE ETHERIFICATION:
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) | 1965-12-17 | 1966-06-18 | 1966-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-17 | 1970-06-18 | 1970-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-17 | 1974-06-18 | 1974-12-18 | $7700.00 | Window Closed / Lapsed |