US3718467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive working photographic process for producing colored images of metal chelates of sulfur compounds
Assignee: Canon Inc
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Filing: 1971-03-25
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Granted: 1973-02-27
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Expires: 1991-03-25
Abstract
Abstract COLORED IMAGES ARE OBTAINED BY IMAGEWISE EXPOSING A COMPOSITION CONTAINING A SULFUR COMPOUND SUCH AS A DITHIOCARBAMATE, THIOXANTHATE OR N,N-DIACETIC ACID DERIVATIVE OF A DITHIOCARBAMATE IN ORDER TO PHOTOLYZE SAID SULFUR COMPOUND AND THEN TREATING THE PHOTOLYZED COMPOSITION WITH A METAL SALT
Inventors
- 👤 E Inoue
- 👤 T Yamase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:44
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73
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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |