High contrast light sensitive materials
Abstract
Abstract PHOTOGRAPHIC ELEMENTS COMPRISING A SUPPORT COATED WITH A HYDROPHILIC LAYER CONTAINING A FINE GRAIN, HIGH CONTRAST SILVER HALIDE EMULSION THAT IS ORTHOCHROMATICALLY SENSITIZED WITH A DECOLORIZABLE SPECTRAL SENSITIZING DYE THAT PRODUCES A MODICUM OF SENSITIVITY IN THE RED REGION OF THE SPECTRUM, SAID ELEMENTS HAVING POOR TOLERANCE TO RED SAFELIGHT ARE MADE TOLERANT TO RED SAFELIGHT BY INCORPORATING IN THE HYDROPHILIC COLLOID LAYER WITH OR ABOVE THE SILVER HALIDE, A WATER-SOLUBLE ANTHRAQUINONE DYE WHICH HAS SUBSTANTIALLY NO ABSORPTION OF LIGHT IN THE BLUE AND GREEN REGIONS OF THE SPECTRUM BUT STRONGLY ABSORBS LIGHT IN THE RED REGION OF THE SPECTRUM, WITHOUT ADVERSELY AFFECTING THE QUALITY OFTHE DEVELOPED, HIGH CONTRAST IMAGES OR LEAVING ANY APPRECIABLE STAIN IN THE PROCESSED ELEMENT.
Inventors
- 👤 Eugene D Salesin
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |