Patent US2760862A successfully refreshed from Google Patents.
US2760862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing duplicate color positives by means of a conformed color corrected negative
Assignee: GAF Chemicals Corp
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Filing: 1953-08-19
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Granted: 1956-08-28
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Expires: 1973-08-19
Abstract
No abstract record available.
Inventors
- 👤 Harold C Harsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:43
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/12; G03C7/00; G03C7/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
238 words
THE METHOD OF PRODUCING A SUBTRACTIVE MULTICOLOR POSITIVE PRINT, OF SATISFACTORY COLOR RENDITION AND CONTRAST FOR PROJECTING PURPOSES, FROM A SUBTRACTIVELY MULTICOLORED POSITIVE TRANSPARENT ORIGINAL HAVING AN IMAGE GRADIENT BETWEEN 1.5 AND 1.6. WHICH COMPRISES PLACING THE POSITIVE IN REGISTRY WITH A NEGATIVE SILVER COLOR CORRECTION MASK PREPARED BY EXPOSING A BLACK AND WHITE FILM THROUGH SAID POSITIVE ORIGINAL WITH LIGHT HAVING A CONTINUOUS BAND RANGING FROM THE GREEN TO THE RED REGIONS OF THE SPECTRUM AND DEVELOPING SAID BLACK AND WHITE FILM TO A GRADIENT BETWEEN 0.4 AND 0.6, PRINTING THE SAID MASKED ORIGINAL ONTO A FINE GRAIN MULTICOLOR NEGATIVE FILM HAVING SUPERIMPOSED SILVER HALIDE EMULSIONS, THE INNERMOST OF WHICH IS SENSITIZED FOR RED AND CONTAINS A COLOR FORMER FOR PRODUCING A CYAN IMAGE, THE INTERMEDIATE LAYER OF WHICH IS SENSITIZED FOR GREEN AND CONTAINS A COLOR FORMER CAPABLE OF PRODUCING A MAGENTA IMAGE, AND THE OUTERMOST LAYER OF WHICH IS SENSITIZED FOR BLUE AND CONTAINS A COLOR FORMER CAPABLE OF PRODUCING A YELLOW IMAGE, PROCESSING SAID NEGATIVE FILM BY DEVELOPMENT IN A PRIMARY AROMATIC AMINO COLOR DEVELOPER, BLEACHING AND FIXING THE SAME TO A COLOR CORREACTED NEGATIVE HAVING AN IMAGE GRADIENT BETWEEN 1.0 AND 1.1, PRINTING THE COLOR CORRECTED NEGATIVE ONTO A MULTILAYER COLOR POSITIVE FILM HAVING A GRADIENT BETWEEN 2.8 AND 3.0. AND PROCESSING THE PRINTED POSITIVE FILM BY COLOR DEVELOPMENT TO A SUBTRACTIVELY MULTICOLORED POSITIVE PRINT HAVING AN IMAGE GRADIENT BETWEEN 2.8 AND 3.2.
Claim 2
Independent Claim
238 words
THE METHOD OF PRODUCING A SUBTRACTIVE MULTICOLOR POSITIVE PRINT, OF SATISFACTORY COLOR RENDITION AND CONTRAST FOR PROJECTING PURPOSES, FROM A SUBTRACTIVELY MULTICOLORED POSITIVE TRANSPARENT ORIGINAL HAVING AN IMAGE GRADIENT BETWEEN 1.5 AND 1.6. WHICH COMPRISES PLACING THE POSITIVE IN REGISTRY WITH A NEGATIVE SILVER COLOR CORRECTION MASK PREPARED BY EXPOSING A BLACK AND WHITE FILM THROUGH SAID POSITIVE ORIGINAL WITH LIGHT HAVING A CONTINUOUS BAND RANGING FROM THE GREEN TO THE RED REGIONS OF THE SPECTRUM AND DEVELOPING SAID BLACK AND WHITE FILM TO A GRADIENT BETWEEN 0.4 AND 0.6, PRINTING THE SAID MASKED ORIGINAL ONTO A FINE GRAIN MULTICOLOR NEGATIVE FILM HAVING SUPERIMPOSED SILVER HALIDE EMULSIONS, THE INNERMOST OF WHICH IS SENSITIZED FOR RED AND CONTAINS A COLOR FORMER FOR PRODUCING A CYAN IMAGE, THE INTERMEDIATE LAYER OF WHICH IS SENSITIZED FOR GREEN AND CONTAINS A COLOR FORMER CAPABLE OF PRODUCING A MAGENTA IMAGE, AND THE OUTERMOST LAYER OF WHICH IS SENSITIZED FOR BLUE AND CONTAINS A COLOR FORMER CAPABLE OF PRODUCING A YELLOW IMAGE, PROCESSING SAID NEGATIVE FILM BY DEVELOPMENT IN A PRIMARY AROMATIC AMINO COLOR DEVELOPER, BLEACHING AND FIXING THE SAME TO A COLOR CORREACTED NEGATIVE HAVING AN IMAGE GRADIENT BETWEEN 1.0 AND 1.1, PRINTING THE COLOR CORRECTED NEGATIVE ONTO A MULTILAYER COLOR POSITIVE FILM HAVING A GRADIENT BETWEEN 2.8 AND 3.0. AND PROCESSING THE PRINTED POSITIVE FILM BY COLOR DEVELOPMENT TO A SUBTRACTIVELY MULTICOLORED POSITIVE PRINT HAVING AN IMAGE GRADIENT BETWEEN 2.8 AND 3.2.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-28 | 1960-02-27 | 1960-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-28 | 1964-02-27 | 1964-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-28 | 1968-02-27 | 1968-08-28 | $7700.00 | Window Closed / Lapsed |