US2511229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of cellulose sulfate
Assignee: EIDP Inc
•
Filing: 1948-04-22
•
Granted: 1950-06-13
•
Expires: 1968-04-22
Abstract
No abstract record available.
Inventors
- 👤 Thomas John Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:05
CPC Classifications
C; C08; C08B; C08B5/00; C08B5/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A PROCESS FOR THE PREPARATION OF CELLULOSE SULFATE WHICH COMPRISES INPREGNATING COTTON LINTERS WITH AN EQUAL WEIGHT OF AN AQUEOUS SOLUTION CONTAINING 20% BY WEIGHT OF SULFAMIC ACID AND 40% BY WEIGHT OF UREA, DRYING THE WET LINTERS, AND HEATING THE DRIED IMPREGNATED LINTERS AT 135-140*C. FOR HALF AN HOUR.
Claim 2
Dependent Claim
50 words
A PROCESS FOR THE PREPARATION OF CELLULOSE SULFATE WHICH COMPRISES INPREGNATING COTTON LINTERS WITH AN EQUAL WEIGHT OF AN AQUEOUS SOLUTION CONTAINING 20% BY WEIGHT OF SULFAMIC ACID AND 40% BY WEIGHT OF UREA, DRYING THE WET LINTERS, AND HEATING THE DRIED IMPREGNATED LINTERS AT 135-140*C. FOR HALF AN HOUR.
References Cited (Backward Citations)
US2089697A
Cited
US2174534A
Cited
US2142115A
Cited
US2142116A
Cited
US2286726A
Cited
US2212152A
Cited
US2422730A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-12 | 1953-12-12 | 1954-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-12 | 1957-12-12 | 1958-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-12 | 1961-12-12 | 1962-06-13 | $7700.00 | Window Closed / Lapsed |