US2895825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of photographic colour images with heterocyclic developers
Assignee: Agfa Gevaert NV
•
Filing: 1955-03-08
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Granted: 1959-07-21
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Expires: 1975-03-08
Abstract
No abstract record available.
Inventors
- 👤 Pelz Willibald
- 👤 Burgardt Lothar
- 👤 Wahl Ottmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:32
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/36; G03C7/38; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3028; G03C5/3035
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
IN THE PROCESS OF PRODUCING PHOTOGRAPHIC COLOR IMAGES BY DEVELOPING AN EXPOSED SILVER HALIDE EMULSION WITH A COLOR FORMING DEVELOPER IN AN ALKLI-CONTAINING BATH AND IN THE PRESENCE OF A COLOR COUPLER CONTAINING A COUPLING RADICAL SELECTED FROM THE CLASS CONSISTING OF REACTIVE METHYLENE AND HYDROXY ARYL GROUPS, WHICH COUPLER REACTS WITH THE OXIDATION PRODUCTS OF THE DEVELOPER TO PRODUCE STABLE DYES THAT FORM IN THE PORTIONS OF THE EMULSION WHERE DEVELOPMENT TAKES PLACE AND REMAIN IN THOSE PORTIONS TO GIVE A DYE IMAGE CORRESPONDING TO THE EXPOSURE, THE IMPROVEMENT BY WHICH THE DEVELOPER IS SELECTED FROM THE CLASS CONSISTING OF
Claim 2
Dependent Claim
101 words
IN THE PROCESS OF PRODUCING PHOTOGRAPHIC COLOR IMAGES BY DEVELOPING AN EXPOSED SILVER HALIDE EMULSION WITH A COLOR FORMING DEVELOPER IN AN ALKLI-CONTAINING BATH AND IN THE PRESENCE OF A COLOR COUPLER CONTAINING A COUPLING RADICAL SELECTED FROM THE CLASS CONSISTING OF REACTIVE METHYLENE AND HYDROXY ARYL GROUPS, WHICH COUPLER REACTS WITH THE OXIDATION PRODUCTS OF THE DEVELOPER TO PRODUCE STABLE DYES THAT FORM IN THE PORTIONS OF THE EMULSION WHERE DEVELOPMENT TAKES PLACE AND REMAIN IN THOSE PORTIONS TO GIVE A DYE IMAGE CORRESPONDING TO THE EXPOSURE, THE IMPROVEMENT BY WHICH THE DEVELOPER IS SELECTED FROM THE CLASS CONSISTING OF
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) | 1962-07-20 | 1963-01-19 | 1963-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-20 | 1967-01-19 | 1967-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-20 | 1971-01-19 | 1971-07-21 | $7700.00 | Window Closed / Lapsed |