US3563745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide photographic materials containing 1-arylmethyl-2-pyrazolin-5-one color couplers
Assignee: Agfa Gevaert NV
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Filing: 1967-08-31
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Granted: 1971-02-16
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Expires: 1987-08-31
Abstract
Abstract COLORLESS MAGENTA FORMING COLOR COUPLERS OF THE 2PYRAZOLIN-5-ONE TYPE HAVING FORMULA: 1-(AR-CH2-),3-(R-CO-HN-)-2-PYRAZOLIN-5-ONE WHEREIN: AR REPRESENTS AN ARYL GROUP, AND R REPRESENTS AN ALKYL RADICAL, AN ARYL RADICAL, AN ARALKYL RADICAL, AN ALKOXY RADICAL, IN ARYLOXY RADICAL, AN ARALKYLOXY RADICAL, AN ALKYLAMINO RADICAL AN ARYLAMINO RADICAL OR AN ANALKYLAMINO RADICAL ARE DESCRIBED. THESE COLOR COUPLERS HAVE IMPROVED STABILITY WHEN STORED IN HUMID AND WARM ATMOSPHERES AND THE WHITE IMAGE AREAS DO NOT UNDERGO DISCOLORATION.
Inventors
- 👤 Hector Alfons Vanden Eynde
- 👤 Robert Joseph Pollet
- 👤 Arthur Henri De Cat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:45
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/36; G03C7/38; G03C7/384
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |