US3563748A
Expired / Lapsed
US
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Photographic material containing a filter dye
Assignee: Agfa Gevaert NV
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Filing: 1967-02-15
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Granted: 1971-02-16
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Expires: 1987-02-15
Abstract
Abstract A LIGHT-SENSITIVE PHOTOGRAPHIC MATERIAL INCLUDING A DYE CORRESPONDING TO THE FORMULA: 1-R2,3-R1,4-((NC-(CH2)N-)2-N-A-CH=)-2-PYRAZOLIN-5-ONE WHEREIN: A IS AN ARYLENE NUCLEUS, OR AN ARYLENE NUCLEUS FORMING PART OF A FUSED RING SYSTEM, EACH OF R1 AND R2 IS AN ARYL GROUP, AT LEAST ONE OF SAID ARYL GROUPS BEING SUBSTITUTED DIRECTLY OR OVER -O-, -S-, -SO-, -SO2-, -SO2-N(-R)- GROUP, -CO-, -COO- OR A -N(-R)- GROUP WHEREIN R REPRESENTS HYDROGEN OR AN ALKYL GROUP, WITH AN ALKYL GROUP OF 5 TO 20 CARBON ATOMS, AND N REPRESENTS, 1, 2, OR 3 IS DESCRIBED. THE PHOTOGRAPHIC MATERIALS HAVE EXCELLENT SPECTRAL ABSORPTION CHARACTERISTICS FOR FILTER PURPOSES AND ARE VERY RESISTANT TO DIFFUSION.
Inventors
- 👤 Henri Depoorter
- 👤 Guy Alfred Rillaers
- 👤 Felix Jan Moelants
- 👤 Theofiel Hubert Ghys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:47
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/83; G03C1/832; C; C07; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/18; C07D231/20; C07D231/22; C07D231/24
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 |