US3577236A
Expired / Lapsed
US
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Color diffusion transfer processes and elements comprising auxiliary developers or their precursors
Assignee: Eastman Kodak Co
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Filing: 1969-09-29
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Granted: 1971-05-04
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Expires: 1989-09-29
Abstract
Abstract IMPROVED MINIMUM PRINT DENSITIES ARE PRODUCED IN COLOR DIFFUSION TRANSFER SYSTEMS BY PROCESSING IN THE PRESENCE OF A LACTONE DERIVATIVE SILVER HALIDE DEVELOPING AGENT, SUCH AS A COUMARIN DERIVATIVE, WHICH HAS THE PROPERTY OF FORMING A LACTONE DEVELOPING AGENT PRECURSOR UNDER ACID, NEUTRAL AND SLIGHTLY ALKALINE CONDITIONS.
Inventors
- 👤 Delbert D Fix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:37
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/08; G03C8/10; G03C8/12; G03C8/14; G03C8/16; Y; Y10; Y10S; Y10S430/00; Y10S430/156; Y10S430/16
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |