US3736136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dye diffusion transfer process for the production of positive color photographic images
Assignee: Agfa Gevaert AG
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Filing: 1971-06-30
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Granted: 1973-05-29
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Expires: 1991-06-30
Abstract
Abstract POSITIVE COLOR PHOTOGRAPHIC IMAGES ARE PRODUCED BY A MODIFIED DYE DIFFUSION TRANSFER PROCESS INCLUDING EXPOSURE OF A SILVER HALIDE EMULSION LAYER TRANSFER OF A DIFFUSING DEVELOPMENT INHIBITING SUBSTANCE FROM THE EXPOSED AREAS TO AN UNEXPOSED DEVELOPABLE EMULSION LAYER WHEREBY DEVELOPMENT IS INHIBITED BY THE SAID TRANSFERRED DEVELOPMENT INHIBITING SUBSTANCE AND TRANSFER OF A DYE FROM THE SAID SECOOND EMULSION LAYER WHICH IS SPLIT OFF FROM A NON-DIFFUSING DYE-GIVING COMPOUNDS UPON DEVELOPMENT, TO AN IMAGE-RECEIVING ELEMENT, WHEREBY THE NONDIFFUSING DYE-GIVING COMPOUND HAS THE FORMULA DEFINED BELOW.
Inventors
- 👤 J Danhauser
- 👤 P Marx
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:23
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/08; G03C8/10; Y; Y10; Y10S; Y10S430/00; Y10S430/156; Y10S430/158
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |