US3690891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared-sensitized silver halide systems
Assignee: Eastman Kodak Co
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Filing: 1970-07-20
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Granted: 1972-09-12
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Expires: 1990-07-20
Abstract
Abstract THIS INVENTION RELATES TO IMPROVED INFRARED-SENSITIZATION OF SILVER HALIDE EMULSIONS CONTAINING SILVER HALIDE GRAINS HAVING METAL DOPANTS OCCULDED THEREIN. IN ONE ASPECT, METHINE DYES HAVING A PRIMARY RADIATION-ADSORPTION PEAK ABOVE 700 NANOMETERS CAN BE USED IN COMBINATION WITH SILVER HALIDE EMULSIONS CONTAINING GRAINS HAVING METAL DOPANTS OCCULDED THEREIN TO PRODUCE HIGHLY IMPROVED INFRAFRED SENSITIVITY. IN ANOTHER ASPECT INFRARED-ABSORBING DYES CAN BE USED IN COMBINATION WITH THE SILVER HALIDE EMULSIONS OF THIS INVENTION IN HIGH CONCENTRATIONS WHICH WOULD NORMALLY CAUSE CONSIDERABLE DISENSITIZATION OF A SURFACE-SENSITIVE SILVER HALIDE EMULSION.
Inventors
- 👤 John Spence
- 👤 Paul Brewster Gilman Jr
- 👤 Cynthia Geer Ulbing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:06
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/015; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C2200/00; G03C2200/06; G03C5/16; G03C5/164
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |