US2607703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of acetic acid solutions of cellulose acetate
Assignee: Eastman Kodak Co
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Filing: 1949-11-23
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Granted: 1952-08-19
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Expires: 1969-11-23
Abstract
No abstract record available.
Inventors
- 👤 William A Resch
- 👤 Joseph S Carruthers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:00
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A METHOD DISSOLVING SOLID CELLULOSE ACETATE HAVING AN ACETYL CONTENT OF 42.5-44% AND SUBSTANTIALLY FREE OF COMBINED SULFUR, IN ACETIC ACID, WHICH COMPRISES INCORPORATING, IN A MIXTURE OF SAID CELLULOSE ACETATE AND ACETIC ACID, 1-10%, BASED ON THE CELLULOSE ESTER, OF PREFORMED MAGNESIUM SULFATE AS A PEPTIZER, THE WATER CONTENT OF THE MASS BEING 3-20% OF THE ACETIC ACID USED WHEREBY THE SOLID CELLULOSE ACETATE IS DISSOLVED.
Claim 2
Independent Claim
67 words
A METHOD DISSOLVING SOLID CELLULOSE ACETATE HAVING AN ACETYL CONTENT OF 42.5-44% AND SUBSTANTIALLY FREE OF COMBINED SULFUR, IN ACETIC ACID, WHICH COMPRISES INCORPORATING, IN A MIXTURE OF SAID CELLULOSE ACETATE AND ACETIC ACID, 1-10%, BASED ON THE CELLULOSE ESTER, OF PREFORMED MAGNESIUM SULFATE AS A PEPTIZER, THE WATER CONTENT OF THE MASS BEING 3-20% OF THE ACETIC ACID USED WHEREBY THE SOLID CELLULOSE ACETATE IS DISSOLVED.
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) | 1955-08-19 | 1956-02-18 | 1956-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-19 | 1960-02-18 | 1960-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-19 | 1964-02-18 | 1964-08-19 | $7700.00 | Window Closed / Lapsed |