US3600176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic elements,compositions and processes
Assignee: Eastman Kodak Co
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Filing: 1968-11-29
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Granted: 1971-08-17
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Expires: 1988-11-29
Abstract
Abstract A DEVELOPING AGENT PRECURSOR WHICH IS A REACTION PRODUCT OF (A) A 3,4-DIHYDROXY FURAN SILVER HALIDE DEVELOPING AGENT, SUCH AS ASCORBIC ACID, OR A HYDROXYTETRONIC ACID SILVER HALIDE DEVELOPING AGENT, SUCH AS 5-PHENYL-3HYDROXYTETRONIC ACID, WITH (B) A BASIC AMINOPHENOL SILVER HALIDE DEVELOPING AGENT IS EMPLOYED IN PHOTOGRAPHIC ELEMENTS, COMPOSITIONS AND PROCESSES, ESPECIALLY DRY PROCESSING WITH HEAT. SUCH A DEVELOPING AGENT PRECURSOR HAS THE PROPERTY OF BEING HEAT ACTIVATED IN THE ABSENCE OF ALKALI.
Inventors
- 👤 Grant M Haist
- 👤 David A Pupo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:30
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/56; C07D307/62; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/42; G03C5/00; G03C5/26; G03C5/29; G03C5/30; Y; Y10; Y10S; Y10S430/00; Y10S430/156
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |