Patent US3799780A successfully refreshed from Google Patents.
US3799780A
Expired / Lapsed
US
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Process for obtaining a high contrast silver halide photographic image
Assignee: Konica Minolta Inc
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Filing: 1972-05-10
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Granted: 1974-03-26
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Expires: 1992-05-10
Abstract
Abstract PROCESS FOR OBTAINING AHIGH CONTRAST SILVER HALIDE PHOTOGRAPHIC IMAGE, WHEREIN, AFTER IMAGEWISE EXPOSURE TO LIGHT, A LIGHT-SENSITIVE SILVER HALIDE PHOTOGRAPHIC MATERIAL HAVING A SILVER HALIDE EMULSION LAYER IS TREATED WITH A LITHTYPE ALKALI DEVELOPER CONTAINING HYDROQUINONE AS A DEVELOPING AGENT, SAID DEVELOPER FURTHER COMPRISING A THIOCYANATE COMPOUND CAPABLE OF LIBERATING THIOCYANATE IONAND NOT MORE THAN 0.004 MOLE OF POTASSIUM BROMIDE PER LITER OF THE DEVELOPER.
Inventors
- 👤 T Suga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:08
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305
Claims Analysis
Total Claims: 0
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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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |