US2553695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of cellulose ethers
Assignee: Celanese Corp
•
Filing: 1948-09-28
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Granted: 1951-05-22
•
Expires: 1968-09-28
Abstract
No abstract record available.
Inventors
- 👤 Wilcox Merlyn Herbert
- 👤 Downing John
- 👤 Drewitt James Gordon Napier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:03
CPC Classifications
C; C08; C08B; C08B11/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
PROCESS FOR THE MANUFACTURE OF CELLULOSE ETHERS, WHICH COMPRISES SUBJECTING CELLULOSE TO THE ACTION OF AN ETHERIFYING AGENT IN THE PRESENCE OF A CAUSTIC ALKALI AND OF A LIQUID ETHER-ALCOHOL IN AN AMOUNT OF FROM 5 TO 30% ON THE WEIGHT OF CELLULOSE.
Claim 2
Dependent Claim
43 words
PROCESS FOR THE MANUFACTURE OF CELLULOSE ETHERS, WHICH COMPRISES SUBJECTING CELLULOSE TO THE ACTION OF AN ETHERIFYING AGENT IN THE PRESENCE OF A CAUSTIC ALKALI AND OF A LIQUID ETHER-ALCOHOL IN AN AMOUNT OF FROM 5 TO 30% ON THE WEIGHT OF CELLULOSE.
References Cited (Backward Citations)
US1980988A
Cited
US2138757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |