Patent US2529981A successfully refreshed from Google Patents.
US2529981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bleaching silver images
Assignee: Eastman Kodak Co
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Filing: 1945-11-28
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Granted: 1950-11-14
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Expires: 1965-11-28
Abstract
No abstract record available.
Inventors
- 👤 Paul W Vittum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:59
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
THE METHOD OF REMOVING ONLY THE SILVER IMAGES FROM A PHOTOGRAPHIC LAYER CONTAINING SILVER AND COLOR DEVELOPED DYE IMAGES OF THE CLASS CONSISTING OF AZOMETHINE, INDANILINE AND INDOPHEONOL DYES, WHICH COMPRISES TREATING SAID LAYER CONTAINING SAID SILVER AND DYE IMAGES WITH A STRONG ACID SOLUTION OF A QUINONE HAVING A PH OF 1.5 TO 3.5, SAID SOLUTION CONTAINING AN ALKALIMETAL HALIDE SELECTED FROM THE GROUP CONSISTING OF CHLORIDES AND BROMIDES, BUT BEING FREE OF ORGANIC SOLVENT, FOLLOWED BY FIXING.
Claim 2
Independent Claim
79 words
THE METHOD OF REMOVING ONLY THE SILVER IMAGES FROM A PHOTOGRAPHIC LAYER CONTAINING SILVER AND COLOR DEVELOPED DYE IMAGES OF THE CLASS CONSISTING OF AZOMETHINE, INDANILINE AND INDOPHEONOL DYES, WHICH COMPRISES TREATING SAID LAYER CONTAINING SAID SILVER AND DYE IMAGES WITH A STRONG ACID SOLUTION OF A QUINONE HAVING A PH OF 1.5 TO 3.5, SAID SOLUTION CONTAINING AN ALKALIMETAL HALIDE SELECTED FROM THE GROUP CONSISTING OF CHLORIDES AND BROMIDES, BUT BEING FREE OF ORGANIC SOLVENT, FOLLOWED BY FIXING.
References Cited (Backward Citations)
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US1969479A
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US2019718A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-13 | 1954-05-15 | 1954-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-13 | 1958-05-15 | 1958-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-13 | 1962-05-15 | 1962-11-14 | $7700.00 | Window Closed / Lapsed |