Patent US3649271A successfully refreshed from Google Patents.
US3649271A
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Preparation plate with silver halide of planographic emulsion comprising hydrophobic thermoplastic polymer particles
Assignee: Agfa Gevaert NV
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Filing: 1967-10-24
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Granted: 1972-03-14
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Expires: 1987-10-24
Abstract
Abstract An improvement on U.S. Pat. No. 3,476,937 wherein the recording material contains, in addition to a continuous phase of hydrophilic binder and a dispersion phase of thermoplastic hydrophobic particles in a weight ratio relative to the binder of at least 1:1, a light-sensitive silver halide and a developing agent for such halide present in the surface layer and/or in an adjacent underlying layer so that exposure and photographic development by means of an alkaline solution produces a silver image in heat-conductive relationship with the thermoplastic particles and subsequent uniform exposure by the developed silver image, the heat generated in the silver image by such absorption rendering the areas of the surface layer in heat-conductive relationship therewith relatively less hydrophilic.
Inventors
- 👤 Marcel Nicolas Vrancken
- 👤 Daniel Alois Claeys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:23
CPC Classifications
B; B41; B41C; B41C1/00; B41C1/10; B41C1/1008; B41C1/1025; B41C2210/00; B41C2210/04; B41C2210/06; B41C2210/24
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
24 words
The preparation of a planographic printing master according to claim 1, wherein said surface layer contains the light-sensitive silver halide and the developing agent.
Claim 2
Dependent Claim
10 words
developing the latent silver image in an alkaline solution, and
Claim 3
Dependent Claim
58 words
uniformly exposing the developed material to electromagnetic radiation which effects an image-wise heating in the said surface layer as a consequence of the absorption of said radiation by the developed silver image, whereby the recording layer in the areas corresponding with the silver image is rendered less hydrophilic in a sufficient degree as to accept oily printing ink.
Claim 4
Dependent Claim
27 words
The preparation of a planographic printing master according to claim 1, wherein the silver halide is a part of a silver halide emulsion of the negative type.
Claim 5
Dependent Claim
30 words
The preparation of a planographic printing master according to claim 3, wherein the silver halide is a part of a silver hall emulsion suited for the reproduction of graphic information.
Claim 6
Dependent Claim
35 words
The preparation of a planographic printing master according to claim 1, wherein the dispersion of said polymer particles in the hydrophilic binder is present in said recording layer for at least 50 percent by volume.
Claim 7
Dependent Claim
19 words
The preparation of a planographic printing master accordIng to claim 1, wherein the recording layer contains hydrophobic thermoplastic wax.
Claim 8
Dependent Claim
25 words
The preparation of a planographic printing master according to claim 1, wherein the dispersed hydrophobic thermoplastic polymer particles size from 0.01 to 50 Mu .
Claim 9
Dependent Claim
24 words
The preparation of a planographic printing master according to claim 1, wherein the silver halide is a part of a direct-positive silver halide emulsion.
Claim 10
Dependent Claim
17 words
The preparation of a planographic printing master according to claim 2, wherein the developing agent is hydroquinone.
Claim 11
Dependent Claim
31 words
The preparation of a planographic printing master according to claim 1, wherein the uniform exposure of the developed recording material is carried out by means of a lamp emitting infrared light.
Claim 12
Dependent Claim
34 words
The preparation of a planographic printing master according to claim 1, with the modification that after the development of the latent silver image, the recording material is treated with a stop- or stabilizing bath.
Claim 13
Dependent Claim
54 words
The preparation of a planographic printing master according to claim 1, wherein the recording material after its development is squeezed between rollers in order to remove a substantial part of moisture absorbed in it and thereupon is nondifferentially exposed to electromagnetic radiation which is absorbed in the silver image and converted therein into heat.
Claim 14
Dependent Claim
62 words
The preparation of a planographic printing master according to claim 1, wherein a silver halide emulsion of the negative type is exposed with a positive original in such a way that on development a laterally reversed silver image with reversed image values in respect of the original is produced and the resultant planographic printing master is suited for direct reversed planographic printing.
Claim 15
Dependent Claim
24 words
The preparation of a planographic printing master according to claim 1, with the modification that additional developing agent is present in the alkaline solution.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |