US3676124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic negative material for color diffusion transfer process
Assignee: Fujifilm Holdings Corp
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Filing: 1969-10-13
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Granted: 1972-07-11
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Expires: 1989-10-13
Abstract
Abstract PHOTOGRAPHIC DIFFUSION TRANSFER ELEMENT WITH A SILVER HALIDE EMULSION CONTAINING A COLOR DEVELOPING AGENT AND COUPLER DISSOLVED IN A HIGH TEMPERATURE BOILING ORGANIC SOLVENT WHICH IS IMMISCIBLE WITH WATER, BUT MISCIBLE UPON CONTACT WITH AN ALKALINE MEDIUM. A COLOR DIFFUSION TRANSFER PROCESS USING THE ABOVE ELEMENT AS A NEGATIVE INVOLVES EXPOSING THE ELEMENT AND THEN, BY ALKALINE PROCESSING, FREEING THE SOLVENT TO THEREBY PERMIT TRANSFER TO A POSITIVE ELEMENT AND YIELD A POSITIVE ELEMENT. CONVENTIONAL DIFFUSION TRANSFER STEPS ARE ALSO PRACTICAL.
Inventors
- 👤 Kinji Ohkubo
- 👤 Katsumi Hayashi
- 👤 Kazuya Sano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:50
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/18; C07D231/20; C07D231/22; G; G03; G03C; G03C7/00; G03C7/30; G03C7/3003; G03C8/00; G03C8/02; G03C8/08
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |