US2668168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose trisalkylcarbamates and process of making the same
Assignee: EIDP Inc
•
Filing: 1951-06-01
•
Granted: 1954-02-02
•
Expires: 1971-06-01
Abstract
No abstract record available.
Inventors
- 👤 Pikl Josef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:33
CPC Classifications
C; C08; C08B; C08B15/00; C08B15/05; C08B15/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
2 words
CELLULOSE TRISOCTADECYLCARBAMATE.
Claim 2
Dependent Claim
75 words
A PROCESS FOR PRODUCING CELLULOSE 1 MOL OF CARBAMATES, WHICH COMPRISES REACTING 1 MOL OF CELLULOS (ON BASIS OF C6H10O5) WITH FROM 6 TO 9 MOLS OF AN ALKYL ISOCYANATE HAVING FROM 2 TO 18 C-ATOMS IN THE ALKYL RADICAL, THE REACTION BEING EFFECTED BY HEATING THE REACTANTS TOGETHER IN A SUFFICIENT QUANTITY OF DIMETHYL FORMAMIDE TO FORM A STIRRABLE REACTION MASS, AT A TEMPERATURE NOT LESS THAN 80* C. AND NOT EXCEEDING 160* C.
References Cited (Backward Citations)
US1357450A
Cited
US1991107A
Cited
US2303364A
Cited
US2284896A
Cited
US2339193A
Cited
US2536634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |