US3773539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing light-sensitive photographic material with manganese dioxide layer
Assignee: Konica Minolta Inc
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Filing: 1971-03-25
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Granted: 1973-11-20
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Expires: 1991-03-25
Abstract
Abstract A COOLOIDAL MANGANESE DIOXIDE DISPERSION OBTAINED BY THE REACTION OF POTASSIUM PERMANGANATE WITH A CHEMICALLY MODIFIED GELATIN IS PARTICULARLY USEFUL IN A LIGHT-SENSITIVE PHOTOGRAPHIC MATERIAL. THE GELATIN IS TREATED WITH A COMPOUND CAPABLE OF REACTING WITH THE AMINO GROUP OF THE GELATIN, E.G. SULFONYL CHLORIDES, CARBOXYLIC ACID CHLORIDES, ACID ANHYDRIDES, ISOCYANATES AND 1,4-DIKETONES. UNDESIRED HALATION OR IRRADIATION CAN BE EFFECTIVELY PREVENTED.
Inventors
- 👤 S Sato
- 👤 T Nakajima
- 👤 M Shono
- 👤 S Korematsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:58
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |