US3782948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic material containing nitro compounds for the silver dyestuff bleaching process
Assignee: Ilford Imaging Switzerland GmbH
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Filing: 1972-01-13
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Granted: 1974-01-01
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Expires: 1992-01-13
Abstract
Abstract AROMATIC OR HETEROCYCLIC NITRO COMPOUNDS AS OXIDIZING AGENTS FOR THE REDUCED DYESTUFF BLEACHING CATALYST IN PHOTOGRAPHIC MATERIAL FOR THE SILVER DYESTUFF BLEACHING PROCESS.
Inventors
- 👤 H Schaller
- 👤 A Froehlich
- 👤 A Oetiker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:34
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/72; C07D213/75; C07D215/00; C07D215/02; C07D215/16; C07D215/38; C07D215/42; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/18; C07D231/20; C07D231/22; C07D231/24; G; G03; G03C; G03C7/00; G03C7/28; C07C; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/26
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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |