US3733201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic compositions and elements comprising coupling compounds which on development release silver halidecomplexing materials and dyes
Assignee: Eastman Kodak Co
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Filing: 1971-10-01
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Granted: 1973-05-15
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Expires: 1991-10-01
Abstract
Abstract A NOVEL CLASS OF SELENIUM AND TELLURIUM ORGANIC ETHER PHOTOGRAPHIC COUPLER COMPOUNDS HAVING UTILITY IN THE COLOR PHOTOGRAPHIC AREA, SUCH COMPOUNDS CONTAINING A RELEASABLY LINKED ORGANIC RADICAL ATTACHED AT A COUPLING SITE BY A DIVALNT SELENIUM OR TELLURIUM ATOM, PHOTOGRAPHIC EMULSIONS, DEVELOPING COMPOSITIONS AND PHOTOGRAPHIC ELEMENTS CONTAINING SUCH COMPOUNDS AS WELL AS A PROCESS FORDEVELOPING THE EXPOSED PHOTOGRAPHIC ELEMENTS.
Inventors
- 👤 C Barr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:53
CPC Classifications
C; C07; C07D; C07D257/00; C07D257/02; C07D257/04; G; G03; G03C; G03C7/00; G03C7/30; G03C7/305; G03C7/30541; G03C7/30552
Claims Analysis
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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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |