US3679424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fogged,direct-positive silver halide emulsion containing nitron
Assignee: Eastman Kodak Co
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Filing: 1969-11-05
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Granted: 1972-07-25
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Expires: 1989-11-05
Abstract
Abstract THIS INVENTION RELATED TO DIRECT-POSITIVE, SILVER HALIDE, PHOTOGRAPHIC ELEMENTS. IN ONE ASPECT, AT LEAST ONE LAYER OF SAID ELEMENT CONTAINS NITRON. IN ANOTHER ASPECT, AN OVER-LAYER CONTAINING LIGHT-INSENSITIVE SILVER CHLORIDE IS USED TO PROVIDE MORE UNIFORM PHOTOGRAPHIC CHARACTERISTICS IN USED DEVELOPERS. IN STIFF ANOTHER ASPECT, IMPROVED DIRECT-POSITIVE SILVER HALIDE GRAINS ARE PREPARED BY REDUCING A PORTION OF THE WATER-SOLUBLE SILVER SALT BEFORE ADMIXTURE WITH THE WATER-SOLUBLE HALIDE TO PRECIPITATE THE SILVER HALIDE GRAINS.
Inventors
- 👤 Jean-France Leon Paul Barbier
- 👤 Guy Renard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:00
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/485; G03C1/48515
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |