Patent US3565620A successfully refreshed from Google Patents.
US3565620A
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US
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Photographic processing liquids and method of producing photographic images
Assignee: Agfa Gevaert NV
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Filing: 1967-10-24
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Granted: 1971-02-23
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Expires: 1987-10-24
Abstract
Abstract CARBAZIC ACID, BICARBAMIC ACID, OR A WATER-SOLUBLE SALT THEREOF IS USED IN THE PRODUCTION OF PHOTOGRAPHIC REVERSAL IMAGES OR DIRECT POSTITIVES, BOTH BLACK AND WHITE AND COLORED. THE ADDITIVE CAN BE ADDED TO THE DEVELOPING LIQUID FOR THE DEVELOPMENT STAGE OF THE REVERSAL PROCESS, OR BY WAY OF ANOTHER PROCESSING LIQUID FOR WETTING THE MATERIAL BEING PROCESSED PRIOR TO THE DEVELOPMENT WHERE THE REVERSAL PROCESS UTILZES PLURAL DEVELOPMENT STAGES THE ADDITIVE IS PREFERABLY APPLIED BY WAY OF THE FINAL DEVELOPING LIQUID OR ANOTHER PROCESSING LIQUID APPLIED PRIOR TO THE FINAL DEVELOPMENT STEP.
Inventors
- 👤 Jozef Frans Willems
- 👤 Gerard L Vanreusel
- 👤 Camille A Vandeputte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:40
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/50; G03C1/00; G03C1/005; G03C1/485; G03C1/48538; G03C1/48546; G03C1/48553
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |