US2756151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of dye stain in processed photographic papers containing dyes
Assignee: Eastman Kodak Co
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Filing: 1952-08-01
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Granted: 1956-07-24
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Expires: 1972-08-01
Abstract
No abstract record available.
Inventors
- 👤 Walter J Weyerts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:27
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
IN THE PROCESSING OF SILVER HALIDE SENSITIZED PAPERS CONTAINING SENSITIZING DYES IN WHICH THE PAPER AFTER EXPOSURE IS DEVELOPED, FIXED AND WASHED, THE METHOD OF REDUCING DYE STAIN IN THE PROCESSED, WASHED AND DRIED PAPER WHICH COMPRISES TREATING THE PAPER IN THE PROCESSING OPERATION BETWEEN THE DEVELOPING AND FINAL WASHING STEPS WITH A FIXING BATH CONTAINING IN SOLUTION THEREIN A COMPOUND SELECTED FROM THE ARYL AND ALKARYL SULFONIC ACIDS AND THEIR WATER SOLUBLE SALTS.
Claim 2
Dependent Claim
74 words
IN THE PROCESSING OF SILVER HALIDE SENSITIZED PAPERS CONTAINING SENSITIZING DYES IN WHICH THE PAPER AFTER EXPOSURE IS DEVELOPED, FIXED AND WASHED, THE METHOD OF REDUCING DYE STAIN IN THE PROCESSED, WASHED AND DRIED PAPER WHICH COMPRISES TREATING THE PAPER IN THE PROCESSING OPERATION BETWEEN THE DEVELOPING AND FINAL WASHING STEPS WITH A FIXING BATH CONTAINING IN SOLUTION THEREIN A COMPOUND SELECTED FROM THE ARYL AND ALKARYL SULFONIC ACIDS AND THEIR WATER SOLUBLE SALTS.
References Cited (Backward Citations)
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US2428208A
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US2440954A
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US2615807A
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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) | 1959-07-24 | 1960-01-23 | 1960-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-24 | 1964-01-23 | 1964-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-24 | 1968-01-23 | 1968-07-24 | $7700.00 | Window Closed / Lapsed |