Patent US2725291A successfully refreshed from Google Patents.
US2725291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo dye couplers having two coupling nuclei
Assignee: Eastman Kodak Co
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Filing: 1952-05-01
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Granted: 1955-11-29
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Expires: 1972-05-01
Abstract
No abstract record available.
Inventors
- 👤 Graham Bruce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:45
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/333; G03C7/3335
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
THE METHOD OF DEVELOPING A COLORED IMAGE IN A SILVER HALIDE EMULSION LAYER WHICH COMPRISES INCORPORATING IN SAID LAYER A COUPLER COMPOUND HAVING THE FORMULA:
Claim 2
Independent Claim
25 words
THE METHOD OF DEVELOPING A COLORED IMAGE IN A SILVER HALIDE EMULSION LAYER WHICH COMPRISES INCORPORATING IN SAID LAYER A COUPLER COMPOUND HAVING THE FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-28 | 1959-05-30 | 1959-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-28 | 1963-05-30 | 1963-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-28 | 1967-05-30 | 1967-11-29 | $7700.00 | Window Closed / Lapsed |