US2649375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive photographic element
Assignee: Eastman Kodak Co
•
Filing: 1950-10-26
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Granted: 1953-08-18
•
Expires: 1970-10-26
Abstract
No abstract record available.
Inventors
- 👤 Harry I Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:53
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/815; G03C1/8155
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A PHOTOGRAPHIC ELEMENT COMPRISING AT LEAST ONE PHOTOGRAPHIC SILVER HALIDE EMULSION LAYER AND A COLORLESS CELLULOSE ESTER LAYER CONTAINING FROM 0.0001 TO 0.0002 PER CENT BY WEIGHT, BASED ON THE CELLULOSE ESTER, OF 7-DIETHYLAMINO-4-METHYLCOUMARIN, SAID CELLULOSE ESTER BEING AN ESTER OF A SATURATED CARBOXYLIC ACID CONTAINING FROM 2 TO 4 CARBON ATOMS.
Claim 2
Dependent Claim
52 words
A PHOTOGRAPHIC ELEMENT COMPRISING AT LEAST ONE PHOTOGRAPHIC SILVER HALIDE EMULSION LAYER AND A COLORLESS CELLULOSE ESTER LAYER CONTAINING FROM 0.0001 TO 0.0002 PER CENT BY WEIGHT, BASED ON THE CELLULOSE ESTER, OF 7-DIETHYLAMINO-4-METHYLCOUMARIN, SAID CELLULOSE ESTER BEING AN ESTER OF A SATURATED CARBOXYLIC ACID CONTAINING FROM 2 TO 4 CARBON ATOMS.
References Cited (Backward Citations)
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Cited
US2331492A
Cited
US2334348A
Cited
US2391959A
Cited
US2508295A
Cited
US2511462A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-17 | 1957-02-16 | 1957-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-17 | 1961-02-16 | 1961-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-17 | 1965-02-16 | 1965-08-18 | $7700.00 | Window Closed / Lapsed |