Patent US3347671A successfully refreshed from Google Patents.
US3347671A
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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
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)
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 |