US3702247A
Expired / Lapsed
US
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Color photographic process using a bleach-fix solution containing a selenosulfate
Assignee: Ilford Imaging UK Ltd
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Filing: 1971-01-12
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Granted: 1972-11-07
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Expires: 1991-01-12
Abstract
Abstract THIS APPLICATION DESCRIBES A COLOUR DEVELOPMENT PROCESS FOR COLOUR SILVER HALIDE PHOTOGRAPHIC MATERIAL, WHEREIN THE MATERIAL AFTER DEVELOPMENT IS TREATED WITH A BLEACHFIX SOLUTION WHICH CONTAINS A MILD OXIDISING AGENT, A SILVER HALIDE SOLVENT AND AS A BLEACH-FIX ACCELERATOR A WATERSOLUBLE SPECIFIED SELENOSULFATE.
Inventors
- 👤 Alun Trefor Rhys Williams
- 👤 David Gerald Alcock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:00
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/42; G03C7/421
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) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |