US3729319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical supersensitisation of silver halide emulsions with three cyanine dyes
Assignee: Ilford Imaging UK Ltd
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Filing: 1971-06-02
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Granted: 1973-04-24
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Expires: 1991-06-02
Abstract
Abstract THIS INVENTION RELATES TO PHOTOGRAPHIC LIGHT-SENSITIVE MATERIAL WHICH COMPRISES A SILVER HALIDE EMULSION CONTAINING A SUPER-SENSITIZING COMBINATION. THE LATTER CONSISTS OF THREE DIFFERENT DYESTUFFS. IT IS USEFUL FOR INCREASING THE SENSITIVITY OF A GREEN SENSITISED EMULSION.
Inventors
- 👤 R Jefferson
- 👤 C Palles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:01
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/28; G03C1/29
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 |