Patent US2540401A successfully refreshed from Google Patents.
US2540401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide emulsion containing color coupler
Assignee: Gevaert Photo Producten NV
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Filing: 1947-03-14
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Granted: 1951-02-06
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Expires: 1967-03-14
Abstract
No abstract record available.
Inventors
- 👤 Merckx Philibert Leopo Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:46
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
26 words
A PHOTOGRAPHIC ELEMENT COMPRISING AT LEAST ONE LIGHT-SENSITIVE SILVER HALIDE EMULSION LAYER CONTAINING A COLOR COUPLER FAST TO DIFFUSION WHICH CORRESPONDS TO THE FOLLOWING GENERAL FORMULA
References Cited (Backward Citations)
US2249541A
Cited
US2334495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |