US3652280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive silver halide emulsion with high resolving power
Assignee: Agfa Gevaert NV
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Filing: 1969-12-08
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Granted: 1972-03-28
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Expires: 1989-12-08
Abstract
Abstract Lippmann silver halide emulsions comprising a hydrophilic colloid are provided which contain at least one light-absorbing dye that absorbs light of the wavelength used for the exposure of the said emulsions and that is decolorized and/or removed in at least one of the photographic processing liquids, characterized in that the said absorbing dye is present in such an amount that per micron of emulsion layer thickness a density of at least 0.05 and at most 0.14, preferably comprising between 0.08 and 0.12, measured in the spectral region of the exposure light, is obtained. The emulsions have high resolving power and acutance, and are suitable for both reversal processing and negative processing.
Inventors
- 👤 Maurice Hector De Belder
- 👤 Rene Omer Duville
- 👤 Herman Adelbert Philippaerts
- 👤 Theofiel Hubert Ghys
- 👤 Henri Depoorter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:29
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/83
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
40 words
Photographic element according to claim 1, wherein the said light-absorbing dye is present in an amount necessary to obtain per micron of layer thickness a density comprised between 0.08 and 0.12, measured in the spectral region of the exposure light.
Claim 2
Dependent Claim
26 words
Photographic element according to claim 1, wherein the ratio of silver halide to hydrophilic colloid in the said emulsion layer is comprised between 1:2 and 4:1.
Claim 3
Dependent Claim
12 words
Photographic element according to claim 1, wherein the hydrophilic colloid is gelatin.
Claim 4
Dependent Claim
12 words
Photographic element according to claim 1, wherein the emulsion is spectrally sensitized.
Claim 5
Dependent Claim
34 words
Photographic element according to claim 1, wherein the light-sensitive silver halide is silver bromoiodide, comprising at most 8 mole percent of silver iodide, and having an average grain-size of at most 0.08 Mu .
Claim 6
Dependent Claim
19 words
Photographic element according to claim 1, wherein the emulsion layer has a thickness comprised between 3 and 8 microns.
Claim 7
Dependent Claim
13 words
Photographic element according to claim 1, wherein the support is a glass plate.
Claim 8
Dependent Claim
128 words
Process for the preparation of images of high resolution and acutance comprising image-wise exposing a photographic element and processing the exposed element so as to obtain a negative image of the original wherein the said element comprises a support and a layer of a silver halide emulsion of the Lippmann type containing a hydrophilic colloid as binder for the silver halide and a non-spectrally sensitizing, light-absorbing dye that absorbs light the spectral composition of which corresponds with that of the exposure light and that is decolorized and/or removed by said processing in the amount necessary to obtain in the said emulsion layer per micron of emulsion layer thickness a density comprised between at least 0.05 and at most 0.14, measured in the spectral region of the exposure light.
Claim 9
Dependent Claim
128 words
Process for the preparation of images of high resolution and acutance comprising image-wise exposing a photographic element and processing the exposed element so as to obtain a direct-positive image of the original wherein the said element comprises a support and a layer of a silver halide emulsion of the Lippmann type containing a hydrophilic colloid as binder for the silver halide and a non-spectrally sensitizing, light-absorbing dye that absorbs light the spectral composition of which corresponds with that of the exposure light and that is decolorized and/or removed by said processing in the amount necessary to obtain in the said emulsion layer per micron of emulsion layer thickness a density comprised between at least 0.05 and at most 0.14, measured in the spectral region of the exposure light.
Claim 10
Dependent Claim
39 words
Process according to claim 10 wherein the said light-absorbing dye is present in an amount necessary to obtain per micron of layer thickness a density comprised between 0.08 and 0.12, measured in the spectral region of the exposure light.
Claim 11
Dependent Claim
25 words
Process according to claim 10 wherein the ratio of silver halide to hydrophilic colloid in the said emulsion layer is comprised between 1:2 and 4:1.
Claim 12
Dependent Claim
11 words
Process according to claim 10 wherein the hydrophilic colloid is gelatin.
Claim 13
Dependent Claim
11 words
Process according to claim 10 wherein the emulsion is spectrally sensitized.
Claim 14
Dependent Claim
33 words
Process according to claim 10 wherein the light-sensitive silver halide is silver bromoiodide, comprising a most 8 mole percent of silver iodide, and having an average grain-size of at most 0.08 Mu .
Claim 15
Dependent Claim
18 words
Process according to claim 10 wherein the emulsion layer has a thickness comprised between 3 and 8 microns.
Claim 16
Dependent Claim
12 words
Process according to claim 10 wherein the support is a glass plate.
References Cited (Backward Citations)
BE699375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |