Patent US3042520A successfully refreshed from Google Patents.
US3042520A
Expired / Lapsed
US
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Bleaching bath for processing color film
Assignee: GAF Chemicals Corp
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Filing: 1959-04-23
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Granted: 1962-07-03
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Expires: 1979-04-23
Abstract
No abstract record available.
Inventors
- 👤 Carl E Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:55
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/40; G03C5/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
IN A PROCESS OF COLOR PHOTOGRAPHY, THE METHOD OF REMOVING SILVER FROM THE FILM AFTER DYESTUFF IMAGE FORMATION BY THE ACTION OF A BLEACHING BATH WHICH COMPRISES TREATING SAID FILM WITH SUCH A BATH CONTAINING AN ALKALI METAL FERRICYANIDE AND N-HEXOXYETHANOL.
Claim 2
Dependent Claim
41 words
IN A PROCESS OF COLOR PHOTOGRAPHY, THE METHOD OF REMOVING SILVER FROM THE FILM AFTER DYESTUFF IMAGE FORMATION BY THE ACTION OF A BLEACHING BATH WHICH COMPRISES TREATING SAID FILM WITH SUCH A BATH CONTAINING AN ALKALI METAL FERRICYANIDE AND N-HEXOXYETHANOL.
References Cited (Backward Citations)
US2419900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-02 | 1966-01-01 | 1966-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-02 | 1970-01-01 | 1970-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-02 | 1974-01-01 | 1974-07-03 | $7700.00 | Window Closed / Lapsed |