Patent US2495232A successfully refreshed from Google Patents.
US2495232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose derivatives and process of preparing same
Assignee: Comptoir des Textiles Artificiels SA
•
Filing: 1946-02-23
•
Granted: 1950-01-24
•
Expires: 1966-02-23
Abstract
No abstract record available.
Inventors
- 👤 Drisch Nicolas
- 👤 Fays Rene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:46
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/25; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/18; B01D71/00; B01D71/06; B01D71/08; B01D71/12; C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/08; C08B15/00; C08B15/005; C08B15/10; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/10; C08G8/28; C08L; C08L1/00; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/41; D21H11/00; D21H11/16; D21H11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A CELLULOSE DERIVATIVE IN WHICH THE MOLECULAR CHAINS OF CELLULOSE ARE CHEMICALLY UNITED BY RESINIFIED BRIDGE LINAGES FORMED BY THE REACTION OF HYDROXYL GROUPS OF THE ORIGINAL MATERIAL FROM WHICH THE DERIVATIVE WAS OBTAINED WITH A NONRESINOUS POLYMETHYLOPHENAL REAGENT CONSISTING ESSENTIALLY OF A TRIMETHYLOPHENOL.
Claim 2
Dependent Claim
44 words
A CELLULOSE DERIVATIVE IN WHICH THE MOLECULAR CHAINS OF CELLULOSE ARE CHEMICALLY UNITED BY RESINIFIED BRIDGE LINAGES FORMED BY THE REACTION OF HYDROXYL GROUPS OF THE ORIGINAL MATERIAL FROM WHICH THE DERIVATIVE WAS OBTAINED WITH A NONRESINOUS POLYMETHYLOPHENAL REAGENT CONSISTING ESSENTIALLY OF A TRIMETHYLOPHENOL.
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) | 1953-01-23 | 1953-07-25 | 1954-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-23 | 1957-07-25 | 1958-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-23 | 1961-07-25 | 1962-01-24 | $7700.00 | Window Closed / Lapsed |