Patent US3567446A successfully refreshed from Google Patents.
US3567446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic etch-bleach baths
Assignee: Eastman Kodak Co
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Filing: 1967-05-01
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Granted: 1971-03-02
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Expires: 1987-05-01
Abstract
Abstract A PROCESS FOR GELATIN RELIEF IMAGES IS DESCRIBED, COMPRISING BATHING THE EXPOSED AND DEVELOPED SILVER HALIDE EMULSION IN AN ETCH BLEACH BATH. THE ETCH BLEACH BATH CONTAINS HYDROGEN PEROXIDE, CUPRIC IONS, HALIDE IONS AND AT LEAST 50 GRAMS PER LITER OF UREA.
Inventors
- 👤 John M Gleadle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:15
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/40; G03C5/29; G03C5/315
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |