US3707374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver-bleaching composition
Assignee: Eastman Kodak Co
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Filing: 1970-08-17
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Granted: 1972-12-26
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Expires: 1990-08-17
Abstract
Abstract A COMPOSITION FOR BLEACHING PHOTOGRAPHIC SILVER WHICH IS RAPID ACTING AND SUITABLE FOR USE IN EITHER COLOR OR BLACK-AND-WHITE PROCESSING COMPRISES A DILUTE AQUEOUS SOLUTION OF (1) A PERSULFATE SALT OR A NITROSODISULFONATE SALT AND (2) AN AROMATIC AMINE TYPICALLY OF THE FORMULA: 1-(X-N(-Y)-),2-R1,3-R2,4-R3,5-R4,6-R5-BENZENE WHERE X AND Y ARE HYDROGEN OR LOWER ALKYL AND R1, R2, R3, R4 AND R5 ARE HYDROGEN, AMINO, HYDROXYL, LOWER ALKYL, LOWER MONOALKYLAMINO OR LOWER DIALKYLAMINO EXCEPT THAT AT LEAST ONE OF R1 TO R5 IS A SUBSTITUENT OTHER THAN HYDROGEN.
Inventors
- 👤 Carol R Van Der Voorn
- 👤 Roland G Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:09
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/40; G03C5/44
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) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |