US2636879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of cellulose ethers
Assignee: EIDP Inc
•
Filing: 1950-04-27
•
Granted: 1953-04-28
•
Expires: 1970-04-27
Abstract
No abstract record available.
Inventors
- 👤 Branan Wiley Monroe
- 👤 Burrows Lawton Arthur
- 👤 Mackey Bill Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:35
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/10; C08B11/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A PROCESS FOR THE PRODUCTION OF WATER SOLUBLE SODIUM CARBOXYMETHYL CELLULOSE WHICH COMPRISES REACTING PURIFIED CELLULOSE GRANULES HAVING AN AVERAGE PARTICLE SIZE OF LESS THAN 150 MICRONS WITH AQUEOUS CAUSTIC ALKALI SOLUTION AND AN ETHERIFYING AGENT, THE RATIO OF THE MOLS OF ETHERIFYING AGENT TO THE MOLS OF CELLULOSE BEING IN THE RANGE OF 0.7 TO 1.3, AND WATER BEING THE SOLE NORMALLY LIQUID INGREDIENT PRESENT.
Claim 2
Dependent Claim
66 words
A PROCESS FOR THE PRODUCTION OF WATER SOLUBLE SODIUM CARBOXYMETHYL CELLULOSE WHICH COMPRISES REACTING PURIFIED CELLULOSE GRANULES HAVING AN AVERAGE PARTICLE SIZE OF LESS THAN 150 MICRONS WITH AQUEOUS CAUSTIC ALKALI SOLUTION AND AN ETHERIFYING AGENT, THE RATIO OF THE MOLS OF ETHERIFYING AGENT TO THE MOLS OF CELLULOSE BEING IN THE RANGE OF 0.7 TO 1.3, AND WATER BEING THE SOLE NORMALLY LIQUID INGREDIENT PRESENT.
References Cited (Backward Citations)
US1960551A
Cited
US2060056A
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US2067946A
Cited
US2294666A
Cited
US2236545A
Cited
US2278612A
Cited
US2332048A
Cited
US2476331A
Cited
US2510355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |