US3574626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide emulsions containing 1-carbomylmethyl-pyrazolone couplers
Assignee: Agfa Gevaert AG
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Filing: 1969-02-24
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Granted: 1971-04-13
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Expires: 1989-02-24
Abstract
Abstract PHOTOGRAPHIC SILVER HALIDE EMULSION CONTAINING A MAGENTA-FORMING 1-CARBOMYLEMETHYL-PYRAZOLONE COUPLER.
Inventors
- 👤 Friedrich-Wilhelm Kunitz
- 👤 Willibald Pelz
- 👤 Fritz Nittel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:03
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/36; G03C7/38; C; C07; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/18; C07D231/20; C07D231/44; C07D231/52; G03C7/384
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |