Patent US2527476A successfully refreshed from Google Patents.
US2527476A
Expired / Lapsed
US
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Cyanoacetylhydrazones as photographic color couplers
Assignee: Gevaert Photo Producten NV
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Filing: 1947-03-14
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Granted: 1950-10-24
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Expires: 1967-03-14
Abstract
No abstract record available.
Inventors
- 👤 Bruylants Pierre Joseph Marie
- 👤 Merckx Philibert Leopo Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:52
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
A COLOR-FORMING DEVELOPER COMPRISING A PRIMARY AROMATIC AMINO SILVER HALIDE DEVELOPING AGENT AND AS COLOR COUPLER A CYANOACETYLHYDRAZONE OF THE GENERAL FORMULA
Claim 2
Dependent Claim
22 words
A COLOR-FORMING DEVELOPER COMPRISING A PRIMARY AROMATIC AMINO SILVER HALIDE DEVELOPING AGENT AND AS COLOR COUPLER A CYANOACETYLHYDRAZONE OF THE GENERAL 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) | 1953-10-23 | 1954-04-24 | 1954-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-23 | 1958-04-24 | 1958-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-23 | 1962-04-24 | 1962-10-24 | $7700.00 | Window Closed / Lapsed |