US2860975A
Expired / Lapsed
US
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Photographic color correction process using 2-azo-1-naphthol dyes
Assignee: Eastman Kodak Co
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Filing: 1956-09-28
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Granted: 1958-11-18
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Expires: 1976-09-28
Abstract
No abstract record available.
Inventors
- 👤 Keith E Whitmore
- 👤 Edward T Pesch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:19
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04; G; G03; G03C; G03C7/00; G03C7/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
121 words
A METHOD FOR FORMING A PHOTOGRAPHIC COLOR-CORRECTION IMAGE WHICH COMPRISES LOCALLY EXPOSING A SILVER HALIDE EMULSION LAYER CONTAINING A MIXTURE OF A COLORLESS COUPLER COMPOUND CAPABLE OF REACTION WITH THE OXIDATION PRODUCT OF A PRIMARY AROMATIC AMINO SILVER HALIDE DEVELOPING AGENT TO FORM A DYE, AND A 2-ZAO-1-NAPHTOL DYE THE 3- AND 4-POSITIONS OF WHICH ARE FREE OF SUBSTITUENTS, DEVELOPING THE EXPOSED EMULSION LAYER WITH SAID DEVELOPER AGENT UNTIL THERE IS OBTAINED IN THE EXPOSED REGION OF THE EMULSION LAYER A COMPOSITE DYE IMAGE COMPOSED OF THE REACTION PRODUTS OF SAID DEVELOPING AGENT WITH SAID COLORIES COUPLER AND SAID 2-AZO-1-NAPHTHOL DYE, THE 2-AZE-1-NAPTHOL DYE REMAINING SUBSTANTIALLY UNCHANGED IN THE UNEXOSED REGION OF THE EMULSION LAYER AS THE RESULT OF COLOR DEVELOPMENT.
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) | 1961-11-17 | 1962-05-19 | 1962-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-17 | 1966-05-19 | 1966-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-17 | 1970-05-19 | 1970-11-18 | $7700.00 | Window Closed / Lapsed |