Patent JPS5038543A successfully refreshed from Google Patents.
Patent US3729318A successfully refreshed from Google Patents.
US3729318A
Expired / Lapsed
US
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Process for cross-linking silver halide gelatino emulsion layer containing non-diffusible compound having epoxide and isocyanate groups
Assignee: Agfa Gevaert AG
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Filing: 1971-07-21
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Granted: 1973-04-24
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Expires: 1991-07-21
Abstract
Abstract PHOTOGRAPHIC GELATINE LAYERS HAVE TO BE HARDENED IN ORDER TO IMPROVE THE MECHANICAL PROPERTIES AND TO RAISE THE MELTING POINT OF THE LAYER. EXCELLENT HARDENING IS OBTAINED BY MEANS OF LOW MOLECULAR COMPOUNDS HAVING A HARDENY EPOXIDE AND A HARDENING ISOCYANATE GROUP.
Inventors
- 👤 W Himmelmann
- 👤 P Bergthaller
- 👤 B Quiring
- 👤 K Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:04
CPC Classifications
C; C07; C07D; C07D303/00; C07D303/02; C07D303/12; C07D303/18; C07D303/20; C07D303/24; C07D303/16; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30; G03C1/306
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |