Patent EP0112657A2 successfully refreshed from Google Patents.
Patent US2492977A successfully refreshed from Google Patents.
US2492977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose acetate solution
Assignee: Eastman Kodak Co
•
Filing: 1946-11-05
•
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 05:30
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.
References Cited (Backward Citations)
US1384188A
Cited
US1668946A
Cited
US1880466A
Cited
US1844365A
Cited
US1896145A
Cited
US1880067A
Cited
US1969183A
Cited
US1930134A
Cited
US2000622A
Cited
US2037292A
Cited
US2150250A
Cited
US2232012A
Cited
GB512967A
Cited
US2319052A
Cited
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 |