US2492977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose acetate solution
Assignee: Eastman Kodak Co
•
Filing: 1946-11-05
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Granted: 1950-01-03
•
Expires: 1966-11-05
Abstract
No abstract record available.
Inventors
- 👤 Charles R Fordyce
- 👤 Bruce E Gramkee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:29
CPC Classifications
C; C08; C08L; C08L1/00; C08L1/08; C08L1/10; C08L1/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
AS A NEW COMPOSITION OF MATTER, A CELLULOSE ACETATE FILM-FORMING SOLUTION CAPABLE OF BEING CAST IN THE FORM OF A SHEET AT TWO DISTINCT RANGES OF FILM-FORMING SPEED FOR A GIVEN CURED FILM THICKNESS, SAID SOLUTION BEING COMPOSED OF CELLULOSE ACETATE HAVING AN ACETYL CONTENT WITHIN THE RANGE OF 42.5% TO 44.0% DISSOLVED IN A SOLVENT MIXTURE COMPOSED OF 65% TO 90% BY WEIGHT OF METHYLENE CHLORIDE, 15% TO 5% OF AN UNSUBSTITUTED ALIPHATIC MONOHYDRIC ALCOHOL OF 1 TO 2 CARBON ATOMS AND 20% TO 5% PROPYLENE CHLORIDE.
Claim 2
Dependent Claim
88 words
AS A NEW COMPOSITION OF MATTER, A CELLULOSE ACETATE FILM-FORMING SOLUTION CAPABLE OF BEING CAST IN THE FORM OF A SHEET AT TWO DISTINCT RANGES OF FILM-FORMING SPEED FOR A GIVEN CURED FILM THICKNESS, SAID SOLUTION BEING COMPOSED OF CELLULOSE ACETATE HAVING AN ACETYL CONTENT WITHIN THE RANGE OF 42.5% TO 44.0% DISSOLVED IN A SOLVENT MIXTURE COMPOSED OF 65% TO 90% BY WEIGHT OF METHYLENE CHLORIDE, 15% TO 5% OF AN UNSUBSTITUTED ALIPHATIC MONOHYDRIC ALCOHOL OF 1 TO 2 CARBON ATOMS AND 20% TO 5% PROPYLENE CHLORIDE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-02 | 1953-07-04 | 1954-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-02 | 1957-07-04 | 1958-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-02 | 1961-07-04 | 1962-01-03 | $7700.00 | Window Closed / Lapsed |