US2510355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of carboxymethylcellulose
Assignee: Wyandotte Chemicals Corp
•
Filing: 1947-11-20
•
Granted: 1950-06-06
•
Expires: 1967-11-20
Abstract
No abstract record available.
Inventors
- 👤 William F Waldeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:16
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/10; C08B11/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
96 words
IN THE PROCESS OF MAKING CARBOXYMETHYLCELLULOSE WHEREIN CELLULOSE IS REACTED WITH CAUSTIC ALKALI AND AN ETHERIFYING AGENT CONTAINING THE CHLORACETATE RADICAL, THE IMPROVEMENT WHICH COMPRISES SUBJECTING TO A MECHANICAL MIXING ACTION, IN THE PRESENCE OF CAUSTIC ALKALI AND ETHERIFYING AGENT, A MASS OF COMMINUTED CELLULOSE HAVING A PARTICLE SIZE CAPABLE OF PASSING THROUGH A 40 MESH SCREEN AND THE MAJORITY OF WHICH IS FINER THAN 100 MESH SCREEN SIZE, SAID MILLED CELLULOSE HAVING A BULK DENSITY OF AT LEAST 5 POUNDS PER CUBIC FOOT; SUCH MECHANICAL MIXING ACTION BEING IN THE FORM OF A COMBINED AGI-
References Cited (Backward Citations)
US1960551A
Cited
US2131733A
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US2067946A
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US2313866A
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US2278612A
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US2332048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-05 | 1953-12-05 | 1954-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-05 | 1957-12-05 | 1958-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-05 | 1961-12-05 | 1962-06-06 | $7700.00 | Window Closed / Lapsed |