Patent US3627531A successfully refreshed from Google Patents.
US3627531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilizing developed silver halide emulsions with heterocyclic thiol compounds
Assignee: Fujifilm Holdings Corp
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Filing: 1968-08-19
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Granted: 1971-12-14
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Expires: 1988-08-19
Abstract
Abstract BY PROCESSING A SILVER HALIDE PHOTOGRAPHIC EMULSION LAYER HAVING DEVELOPED IMAGES IN A STABILIZING SOLUTION CONTAINING A SILVER COMPLEX FORMING AGENT OR A SUBSEQUENT AFTER-TREATING SOLUTION, WHICH CONTAINS A SPECIFIC THIOL COMPOUND, SUCH AS 2-MERCAPTOIMIDAZOLE,THE DECREASE IN ITS DENSITY AND THE DISCOLORATION DURING PRESERVATION, CAUSED BY THE SILVER COMPLEX FORMING AGENT REMAINING IN THE LAYER, CAN BE PREVENTED.
Inventors
- 👤 Fumihiko Nishio
- 👤 Mitsunori Sugiyama
- 👤 Kintaro Nasu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:51
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/38; G03C5/39
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) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |