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US3347671A Expired / Lapsed US ⏱️ 0.0 years remaining

Preparation of photographic direct positive color images and photographic elements therefor

Assignee: Eastman Kodak Co
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Filing: 1963-09-20
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Granted: 1967-10-17
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Expires: 1983-09-20
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Abstract

No abstract record available.

Inventors

  • 👤 Wilho M Salminen

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 15:45
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/08

Claims Analysis

Total Claims: 1
Claim 1
Independent Claim 141 words
A COLOR PHOTOGRAPHIC DIFFUSION TRANSFER PROCESS WHICH COMPRISES EXPOSING TO A VISIBLE SUBJECT A PHOTOGRAPHIC ELEMENT COMPRISING A SUPPORT WITH SUPERPOSED RED, GREEN AND BLUE LIGHT-SENSITIVE DIRECT POSITIVE HYDROPHILIC COLLOID SILVER HALIDE EMULSION LAYERS WHEREIN THE SILVER HALIDE FORMS LATENT IMAGES PREDOMINANTLY INSIDE THE SILVER HALIDE GRAINS AND HAVING DISPOSED INTEGRAL WITH SAID ELEMENT AND CONTIGUOUS TO SAID EMULSIONS A CYAN-FORMING COUPLER, A MAGENTA-FORMING COUPLER AND A YELLOW-FORMING COUPLER, SAID COUPLERS BEING NONDIFFUSIBLE DURING DEVELOPMENT IN THE PRESENCE OF AN ALKALINE COLOR DEVELOPING COMPOSITION CONTAINING AN AROMATIC PRIMARY AMINO COLOR DEVELOPING AGENT, CAPABLE OF FORMING DIFFUSIBLE ACID DYES SUBSTANTIALLY COMPLEMENTARY TO THE COLOR OF THE SPECTRAL SENSITIVITY OF THE RESPECTIVE CONTIGUOUS LIGHT-SENSITIVE LAYERS IN SAID ALKALINE COLOR DEVELOPING COMPOSITION BY REACTION WITH COLOR DEVELOPMENT OXIDATION PRODUCT OF SAID COLOR DEVELOPING AGENT AND HAVING A FORMULA SELECTED FROM THE GROUP CONSISTING OF

References Cited (Backward Citations)

US2588982A Cited
US2936308A Cited
US3227554A Cited
US3227550A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1970-10-16 1971-04-17 1971-10-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1974-10-16 1975-04-17 1975-10-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1978-10-16 1979-04-17 1979-10-17 $7700.00 Window Closed / Lapsed

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