US3097956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyanoethylated cellulose solutions
Assignee: Wyeth Holdings LLC
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Filing: 1960-11-07
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Granted: 1963-07-16
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Expires: 1980-11-07
Abstract
No abstract record available.
Inventors
- 👤 Kenneth W Saunders
- 👤 Norbert M Bikales
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:23
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J3/096; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/14; C08B11/155; C09; C09D; C09D101/00; C09D101/08; C09D101/26; C09D101/28; C09D101/288; C08J2301/00; C08J2301/08; C08J2301/26; C08J2301/28; Y; Y10; Y10S; Y10S8/00; Y10S8/13
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
A METHOD OF PREPARING A CLEAR UNIFORM SHEET OF CYANOETHYLATED CELLULOSE CONTAINING FROM ABOUT 11.5 TO ABOUT 13 WEIGHT PERCENT OF NITROGEN AND HAVING AT LEAST 2.3 CYANOETHYL GROUPS PER ANHYDROGLUCOSE UNIT WHICH COMPRISES: DISSOLVING A CYANOETHYLATED CELLULOSE HAVING THE DESIRED NITROGEN CONTENT TO A CLEAR SOLUTION IN ACETONITRILE, SAID SOLUTION HAVING A DISSOLVED CYANOETHYLATED CELLULOSE CONTENT OF AT LEAST TEN WEIGHT PERCENT; CASTING A FILM OF RESULTANT SOLUTION ON A SUITABLE SURFACE AND REMOVING SUBSTANTIALLY ALL THE ACETONITRILE FROM SAID FILM.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-07-15 | 1967-01-14 | 1967-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-15 | 1971-01-14 | 1971-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-15 | 1975-01-14 | 1975-07-16 | $7700.00 | Window Closed / Lapsed |