Patent US3592652A successfully refreshed from Google Patents.
US3592652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide developer compositions and novel developing agents
Assignee: Eastman Kodak Co
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Filing: 1969-02-20
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Granted: 1971-07-13
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Expires: 1989-02-20
Abstract
Abstract MONOCYLIC AND BICYCLIC PHENOLS CONTAINING AT LEAST ONE SULFONAMIDO GROUP, ESPECIALLY AN AROMATIC SULFONAMIDO GROUP, AND A NITROGEN CONTAINING RADICAL (WHICH MAY BE A SULFONAMIDO GROUP), ARE DESCRIBED. THEY ARE PHOTOGRAPHIC SILVER HALIDE DEVELOPING AGENTS FOR BLACK-AND-WHITE DEVELOPMENT, BUT ARE ESPECIALLY USEFUL AS COMPETING OR BALANCING DEVELOPING AGENTS IN PHOTOGRAPHIC COLOR DEVELOPERS TO CONTROL AMOUNT OF DYE PRODUCED BY THE COLOR DEVELOPER, ESPECIALLY THOSE CONTAINING THE COLOR-FORMER OR COUPLER.
Inventors
- 👤 Charleton C Bard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:01
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3021
Claims Analysis
Total Claims: 0
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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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |