Patent US3565632A successfully refreshed from Google Patents.
US3565632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hardening of gelatin
Assignee: Ilford Imaging UK Ltd
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Filing: 1967-11-03
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Granted: 1971-02-23
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Expires: 1987-11-03
Abstract
Abstract THIS APPLICATION DESCRIBES A PROCESS FOR THE HARDENING OF GELATIN LAYERS IN PHOTOGRAPHIC MATERIALS DURING THE PROCESSING THEREOF WHICH COMPRISES APPLYING TO THE MATERIAL PRIOR TO OR DURING DEVELOPMENT THEREOF A DIALDEHYE OF THE FOLLOWING GENERAL FORMULA: 1,3-(O=CH-),2-R1,4-R3,5-R2,6-R4-BENZENE WHEREIN EITHER R1 OR R2 IS AN HYDROXY GROUP, THE OTHER BEING A HYDROGEN OR HALOGEN ATOM OR AN ALKY, ARALKYL, ARYL OR ALKOXY GROUP, R3 AND R4 ARE THE SAME OR DIFFERENT AND ARE A HYDROGEN OR HALOGEN ATOM OR AN ALKYL, ARALKYL, ARYL OR ALKOXY GROUP.
Inventors
- 👤 Peter Richard Mills
- 👤 Brian Ronald David Whitear
- 👤 John Peter Stonham
- 👤 Anthony Paul Way
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:41
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/268; G03C1/00; G03C1/005; G03C1/06; G03C1/30; G03C1/301
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 |