US3676144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxide hardener in silver halide emulsion layer and formaldehyde and/or glyoxal hardener in adjacent protective layer
Assignee: Agfa Gevaert AG
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Filing: 1970-06-02
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Granted: 1972-07-11
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Expires: 1990-06-02
Abstract
Abstract THE PROCESS IN THE PREPARATION OF PHOTOGRAPHIC MATERIALS OF ADDING EPOXY COMPOUNDS HAVING HARDENING PROPERTIES OT A SILVER HALIDE EMULSION CONTAINING GELATIN, COATING A BASE WITH THE MIXTURE AND THEN COATING WITH A PROTECTIVE GELATIN LAYER CONTAINING FORMALDEHYDE OR GLYOXAL AS A HARDNER.
Inventors
- 👤 Gunter Schulz
- 👤 Wolfgang Himmelmann
- 👤 August Randolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:03
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |