Patent US2865747A successfully refreshed from Google Patents.
US2865747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic color development process
Assignee: Eastman Kodak Co
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Filing: 1955-12-22
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Granted: 1958-12-23
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Expires: 1975-12-22
Abstract
No abstract record available.
Inventors
- 👤 Paul M Mader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:44
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/392; G03C7/39208; G03C7/39212; G03C7/39216
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
A PHOTOGRAPHIC REPRODUCTION PROCESS WHICH COMPRISES EXPOSING TO A SUBJECT A SILVER HALIDE EMULSION LAYER CONTAINING A MIXTURE OF A COUPLER COMPOUND REACTIVE WITH THE OXIDATION PRODUCT OF A PRIMARY AROMATIC AMINO SILVER HALIDE DEVELOPING AGENT TO FORM A DYE AND A HYDROQUINONE DERIVATIVE OF THE CLASS CONSISTING OF N-OCTADECYLHYDROQUINONE, SEC.-OCTADECYLHYDROQUINONE AND 2-HEXADECYL-6-METHYLHYDROQUINONE DISPERSED IN THE EMULSION LAYER BY MEANS OF A SUBSTANTIALLY WATER-INSOLUBLE, LOW MOLECULAR WEIGHT, ORGANIC CRYSTALLOIDAL MATERIAL HAVING A BOILING POINT ABOVE ABOUT 175*C., DEVELOPING THE EXPOSED EMULSION LAYER WITH AN ALKALINE SOLUTION OF A DEVELOPING AGENT OF THE CLASS CONSISTING OF P-AMINOPHENOL, N-ALKYL-O-AMINOPHENOL, AND 3-PYRAZOLIDONE SILVER HALIDE DEVELOPING AGENTS THEREBY FORMING IN THE EMULSION LAYER AN IMAGE OF SILVER AND OXIDIZED HYDROQUINONE DERIVATIVE, REMOVING THE SILVER IMAGE AND RESIDUAL SILVER HALIDE FROM THE EMULSION LAYER, TREATING THE REMAINING OXIDIZED HYDROUNINONE DERIVATIVE IMAGE IN THE PRESENCE OF THE COUPLER COMPOUND WITH AN ALKALINE SOLUTION OF A P-PHENYLENEDIAMINE SILVER HALIDE DEVELOPING AGENT TO FORM A DYE IMAGE IN THE REGION OF ORIGINAL SILVER IMAGE.
Claim 2
Dependent Claim
166 words
A PHOTOGRAPHIC REPRODUCTION PROCESS WHICH COMPRISES EXPOSING TO A SUBJECT A SILVER HALIDE EMULSION LAYER CONTAINING A MIXTURE OF A COUPLER COMPOUND REACTIVE WITH THE OXIDATION PRODUCT OF A PRIMARY AROMATIC AMINO SILVER HALIDE DEVELOPING AGENT TO FORM A DYE AND A HYDROQUINONE DERIVATIVE OF THE CLASS CONSISTING OF N-OCTADECYLHYDROQUINONE, SEC.-OCTADECYLHYDROQUINONE AND 2-HEXADECYL-6-METHYLHYDROQUINONE DISPERSED IN THE EMULSION LAYER BY MEANS OF A SUBSTANTIALLY WATER-INSOLUBLE, LOW MOLECULAR WEIGHT, ORGANIC CRYSTALLOIDAL MATERIAL HAVING A BOILING POINT ABOVE ABOUT 175*C., DEVELOPING THE EXPOSED EMULSION LAYER WITH AN ALKALINE SOLUTION OF A DEVELOPING AGENT OF THE CLASS CONSISTING OF P-AMINOPHENOL, N-ALKYL-O-AMINOPHENOL, AND 3-PYRAZOLIDONE SILVER HALIDE DEVELOPING AGENTS THEREBY FORMING IN THE EMULSION LAYER AN IMAGE OF SILVER AND OXIDIZED HYDROQUINONE DERIVATIVE, REMOVING THE SILVER IMAGE AND RESIDUAL SILVER HALIDE FROM THE EMULSION LAYER, TREATING THE REMAINING OXIDIZED HYDROUNINONE DERIVATIVE IMAGE IN THE PRESENCE OF THE COUPLER COMPOUND WITH AN ALKALINE SOLUTION OF A P-PHENYLENEDIAMINE SILVER HALIDE DEVELOPING AGENT TO FORM A DYE IMAGE IN THE REGION OF ORIGINAL SILVER IMAGE.
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) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |