US3064313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of free acid cellulose ether films
Assignee: Hercules Powder Co
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Filing: 1960-06-14
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Granted: 1962-11-20
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Expires: 1980-06-14
Abstract
No abstract record available.
Inventors
- 👤 Robert W Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:21
CPC Classifications
D; D01; D01F; D01F2/00; C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L1/00; C08L1/08; C08L1/26; C08L1/28; C08L1/286; C08J2301/00; C08J2301/02; C08J2301/08; C08J2301/10; C08J2301/26; C08J2301/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
PROCESS OF PREPARING FILMS OF CARBOXYALKYL CELLULOSE EHTERS IN THE FREE ACID FROM WHICH COMPRISES ACIDIFYING TO PH 3-5 A WATER-SOLUBLE SALT OF A CARBOXYALKYL CELLULOSE ETHER HAVING A D.S. OF 0.3-0.5, FORMING FILMS FROM THE RESULTING ACIDIFIED AQUEOUS SOLUTION OF SAID WATER SOLUBLE SALT OF A CARBOXYALKYL CELLULOSE ETHER, AND REMOVING SALT IONS FROM THE FILMS BY CONTACTING THE FILMS WITH ACID AND WASHING THE FILMS, AND FINALLY DRYING THE FILM.
Claim 2
Dependent Claim
72 words
PROCESS OF PREPARING FILMS OF CARBOXYALKYL CELLULOSE EHTERS IN THE FREE ACID FROM WHICH COMPRISES ACIDIFYING TO PH 3-5 A WATER-SOLUBLE SALT OF A CARBOXYALKYL CELLULOSE ETHER HAVING A D.S. OF 0.3-0.5, FORMING FILMS FROM THE RESULTING ACIDIFIED AQUEOUS SOLUTION OF SAID WATER SOLUBLE SALT OF A CARBOXYALKYL CELLULOSE ETHER, AND REMOVING SALT IONS FROM THE FILMS BY CONTACTING THE FILMS WITH ACID AND WASHING THE FILMS, AND FINALLY DRYING THE FILM.
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) | 1965-11-19 | 1966-05-21 | 1966-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-19 | 1970-05-21 | 1970-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-19 | 1974-05-21 | 1974-11-20 | $7700.00 | Window Closed / Lapsed |