Patent US2688540A successfully refreshed from Google Patents.
US2688540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for color photography
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1951-11-13
•
Granted: 1954-09-07
•
Expires: 1971-11-13
Abstract
No abstract record available.
Inventors
- 👤 Ganguin Karl Otto
- 👤 Macdonald Eric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:58
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/83; G03C1/832; G03C7/00; G03C7/30; G03C7/32; G03C7/333
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A PROCESS FOR PRODUCING COLOR CORRECTION IN AN EXPOSED PHOTOGRAPHIC ELEMENT INCLUDING AT LEAST ONE LIGHT SENSITIVE GELATINO-SILVER HALIDE EMULSION LAYER CONTAINING THEREIN A WATER-SOLUBLE YELLOW STYRYL DYESTUFF AS A COLOR FORMER ADAPTED TO YIELD UPON EXPOSURE AND DEVELOPMENT A MAGENTA COLORED IMAGE, SAID YELLOW STYRYL DYESTUFF HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
51 words
A PROCESS FOR PRODUCING COLOR CORRECTION IN AN EXPOSED PHOTOGRAPHIC ELEMENT INCLUDING AT LEAST ONE LIGHT SENSITIVE GELATINO-SILVER HALIDE EMULSION LAYER CONTAINING THEREIN A WATER-SOLUBLE YELLOW STYRYL DYESTUFF AS A COLOR FORMER ADAPTED TO YIELD UPON EXPOSURE AND DEVELOPMENT A MAGENTA COLORED IMAGE, SAID YELLOW STYRYL DYESTUFF HAVING THE GENERAL FORMULA
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) | 1957-09-06 | 1958-03-08 | 1958-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-06 | 1962-03-08 | 1962-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-06 | 1966-03-08 | 1966-09-07 | $7700.00 | Window Closed / Lapsed |