US3236642A - Process for producing direct positives by the silver salt diffusion process - Google Patents
Process for producing direct positives by the silver salt diffusion process Download PDFInfo
- Publication number
- US3236642A US3236642A US137491A US13749161A US3236642A US 3236642 A US3236642 A US 3236642A US 137491 A US137491 A US 137491A US 13749161 A US13749161 A US 13749161A US 3236642 A US3236642 A US 3236642A
- Authority
- US
- United States
- Prior art keywords
- silver halide
- layer
- image
- silver
- tetrahydropyrimidinethione
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 18
- 238000009792 diffusion process Methods 0.000 title description 5
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 title description 4
- 229910052709 silver Inorganic materials 0.000 claims description 31
- 239000004332 silver Substances 0.000 claims description 31
- -1 SILVER HALIDE Chemical class 0.000 claims description 26
- NVHNGVXBCWYLFA-UHFFFAOYSA-N 1,3-diazinane-2-thione Chemical compound S=C1NCCCN1 NVHNGVXBCWYLFA-UHFFFAOYSA-N 0.000 claims description 9
- 239000000839 emulsion Substances 0.000 claims description 9
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 description 14
- 239000000203 mixture Substances 0.000 description 9
- 239000000126 substance Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 229920002472 Starch Polymers 0.000 description 7
- 239000008107 starch Substances 0.000 description 7
- 235000019698 starch Nutrition 0.000 description 7
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 6
- 108010010803 Gelatin Proteins 0.000 description 6
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- 229920000159 gelatin Polymers 0.000 description 6
- 239000008273 gelatin Substances 0.000 description 6
- 235000019322 gelatine Nutrition 0.000 description 6
- 235000011852 gelatine desserts Nutrition 0.000 description 6
- XFNJVJPLKCPIBV-UHFFFAOYSA-N trimethylenediamine Chemical class NCCCN XFNJVJPLKCPIBV-UHFFFAOYSA-N 0.000 description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 150000002148 esters Chemical class 0.000 description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000004133 Sodium thiosulphate Substances 0.000 description 3
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 3
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 3
- 235000019345 sodium thiosulphate Nutrition 0.000 description 3
- PLIKAWJENQZMHA-UHFFFAOYSA-N 4-aminophenol Chemical compound NC1=CC=C(O)C=C1 PLIKAWJENQZMHA-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910021607 Silver chloride Inorganic materials 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000005018 casein Substances 0.000 description 2
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 description 2
- 235000021240 caseins Nutrition 0.000 description 2
- 150000002170 ethers Chemical class 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 150000004764 thiosulfuric acid derivatives Chemical class 0.000 description 2
- ISHFYECQSXFODS-UHFFFAOYSA-M 1,2-dimethyl-3-propylimidazol-1-ium;iodide Chemical compound [I-].CCCN1C=C[N+](C)=C1C ISHFYECQSXFODS-UHFFFAOYSA-M 0.000 description 1
- KWRGMBARTDLYSH-UHFFFAOYSA-N 1-methyl-1,3-diazinane-2-thione Chemical compound CN1CCCNC1=S KWRGMBARTDLYSH-UHFFFAOYSA-N 0.000 description 1
- PCAXITAPTVOLGL-UHFFFAOYSA-N 2,3-diaminophenol Chemical class NC1=CC=CC(O)=C1N PCAXITAPTVOLGL-UHFFFAOYSA-N 0.000 description 1
- XSFKCGABINPZRK-UHFFFAOYSA-N 4-aminopyrazol-3-one Chemical class NC1=CN=NC1=O XSFKCGABINPZRK-UHFFFAOYSA-N 0.000 description 1
- ZFIQGRISGKSVAG-UHFFFAOYSA-N 4-methylaminophenol Chemical compound CNC1=CC=C(O)C=C1 ZFIQGRISGKSVAG-UHFFFAOYSA-N 0.000 description 1
- 241001479434 Agfa Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- PDQAZBWRQCGBEV-UHFFFAOYSA-N Ethylenethiourea Chemical compound S=C1NCCN1 PDQAZBWRQCGBEV-UHFFFAOYSA-N 0.000 description 1
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 1
- 229920000926 Galactomannan Polymers 0.000 description 1
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical class ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 241001061127 Thione Species 0.000 description 1
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 description 1
- VJHCJDRQFCCTHL-UHFFFAOYSA-N acetic acid 2,3,4,5,6-pentahydroxyhexanal Chemical compound CC(O)=O.OCC(O)C(O)C(O)C(O)C=O VJHCJDRQFCCTHL-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 229910000318 alkali metal phosphate Inorganic materials 0.000 description 1
- XYXNTHIYBIDHGM-UHFFFAOYSA-N ammonium thiosulfate Chemical compound [NH4+].[NH4+].[O-]S([O-])(=O)=S XYXNTHIYBIDHGM-UHFFFAOYSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 1
- 229910001864 baryta Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 235000010980 cellulose Nutrition 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- MCYYJHPHBOPLMH-UHFFFAOYSA-L disodium;dioxido-oxo-sulfanylidene-$l^{6}-sulfane;hydrate Chemical compound O.[Na+].[Na+].[O-]S([O-])(=O)=S MCYYJHPHBOPLMH-UHFFFAOYSA-L 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000008098 formaldehyde solution Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- CMCWWLVWPDLCRM-UHFFFAOYSA-N phenidone Chemical compound N1C(=O)CCN1C1=CC=CC=C1 CMCWWLVWPDLCRM-UHFFFAOYSA-N 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 description 1
- ZUNKMNLKJXRCDM-UHFFFAOYSA-N silver bromoiodide Chemical compound [Ag].IBr ZUNKMNLKJXRCDM-UHFFFAOYSA-N 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 239000012463 white pigment Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C8/00—Diffusion transfer processes or agents therefor; Photosensitive materials for such processes
- G03C8/24—Photosensitive materials characterised by the image-receiving section
- G03C8/243—Toners for the silver image
Definitions
- French Patent No. 879,995 describes a process for the direct production of positives in which the unexposed and, therefore, undevelopable silver halide of an image-wise exposed photographic silver halide emulsion layer is dissolved during or after the development of the negative and is transferred in another image-receiving or transfer layer with which it is in close contact under the catalytic influence of development nuclei that are present in this transfer layer which are capable of precipitating metallic silver from the dissolved silver salt to form a positive image.
- the terms negative and positive are in this case used only in a relative sense, since it is possible by the same process to obtain directly a negative from a negative original.
- This process which is known as a silver salt diffusion process, is used inter alia for high-speed copying in business offices, using a developing apparatus suitable for this purpose.
- the present tendency is to arrange for the entire process to be carried out as quickly as possible, i.e., so that the time of travel through the developing apparatus and thus also the time of contact of the positive with the negative that is required in such a diffusion process should be as short as possible.
- 2(1H -tetrahydropyrimidinethiones can be prepared from N-alkylsubstituted 1,3-propylenediamines and carbon disulfide in a manner analogous to that described by C. F. H. Allen, C. O. Edens and James Van Allan on pages 34 and 35 of Organic Syntheses, vol. 26, published 1946 by John Wiley & Sons, Inc., New York, for the preparation of ethylene thiourea (Z-imidazolidinethione) from ethylenediamine and carbon disulfide.
- 2( lH)-tetrahydropyrimidinethione was described by Arthus E. Baum, in United States Patent No.
- 2(1H)-tetrahydropyrimidinethiones are soluble in water and alkali and are added to the transfer material and/ or to the developer solution in quantities of between 1 and 200 milligrams per square meter of transfer material or per liter of developer.
- Various silver halides and their mixtures such as silver chloride, silver bromide or silver bromoiodide, can be used for the production of the light-sensitive negative material, and the said halides or mixtures can if desired'be optically sensitized in the usual manner.
- All known layerforming substances are to be considered as layer formers for the negative layer, including gelatin, starch, polyvinyl alcohol, cellulose derivatives and the like.
- Paper, and films consisting, for example, of cellulose acetate, cellulose nitrate, polycarbonate, polyethylene terephthalate, polystyrene and others are suitable as the base for the silver halide emulsion layer.
- a base or support consisting of paper or a plastic film is also advantageously used for the positive material.
- other supports such as metal, textile fabric and the like can also be used.
- a layer which contains development nuclei, such as colloidal noble metals or metal sulfides, and, if necessary, a silver halide solvent may be applied to such a support.
- a hydrophilic colloid is advantageously used, such as gelatin, casein, carboxymethyl cellulose, starch, starch ethers, starch esters, galactomannans polymannuronic acids, polymannuronic acid esters, polymannuronic acid amides, polyvinyl alcohol and its derivatives or the like.
- the developer solution can contain a silver halide solvent as well as conventional developer additives, such as preservatives, wetting agents and the like.
- the developer substance can also be added to the negative layer and/or to the positive layer.
- Example 1 A support, for example, a sheet of paper, has applied thereto a solution of the following composition:
- a gelatino-silver chloride layer exposed through an original by reflex copying is developed in a developer having the following composition and brought into contact with the positive:
- Example 2 A sheet of paper is coated as in Example 1 with a layer which contains a white pigment, for example, barium sulfate. To the said layer is then applied a layer having the following composition:
- Gelatin 80 Carboxymethyl cellulose 20 Ag S (colloidal) 0.03 Sodium thiosulphate Water to make 1 liter.
- Example 4 To a sheet of paper is applied a solution having the following composition:
- Gelatin 150 Carboxymethyl cellulose 22' Ag S (colloidal) 0.05 Sodium thiosulphate 60 2(1H)-tetrahydropyrimidinethione 0.03
- This positive material and an exposed negative are each moistened in a developer as in Example 2 and thereafter brought into contact with each other. After a contact time of about 12 seconds, a deep black positive image of the original is obtained.
- the developers may contain any stabilizing agents, anti-fog agents and antioxidants, such as alkali-metal sulphites or salts of hydroxylamine.
- Chemical compounds which can be used as silver halide solvents include, for example, water-soluble thiosulphates, such as alkali-metal thiosulphate, ammonium thiosulphate and alkaline earth thiosulphates.
- An image-receiving material that is insensitive to light which comprises a paper support coated with a layer of a hydrophilic colloidal substance containing development nuclei and containing an amount between about 1 and 200 milligrams per square meter of surface of a 2(1H)-tetrahydropyrimidinethione having the general formula wherein R stands for a radical selected from the group r 5 6 consisting of hydrogen and alkyl radicals containing 1 to in which R is a radical of the group consisting of hydro- 5 carbon atoms. gen and alkyl radicals containing from 1 to 5 carbon 6.
- hydrophilic colloidal substance is selected from the group consisting of gelatin, casein, carboxy 5 References Cited y the Examine! methyl cellulose, starch, starch ethers, starch esters, galac- UNITED STATES PATENTS tomannans, polymannuronic acids, polymannuronic acid esters, polymannuronic acid amides, polyvinyl alcohol 2901351 8/1959 Van ee et a1 260 256'5 and polyvinyl alcohol derivatives. 3017270 1/1962 Tregluus 9629 7.
- aqueous alkaline developer solution containing a developer for silver halides and between 1 and 200 10 FOREIGN TE milligrams per liter of a 2(1H)-tetrahydropyrimidine- 753, 7/ 1956 Great Brltaln- 783,793 10/1957 Great Britain.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEA35652A DE1124355B (de) | 1960-09-24 | 1960-09-24 | Verfahren zur Herstellung direkter Positive nach dem Silbersalzdiffusionsverfahren |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3236642A true US3236642A (en) | 1966-02-22 |
Family
ID=6929173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US137491A Expired - Lifetime US3236642A (en) | 1960-09-24 | 1961-09-12 | Process for producing direct positives by the silver salt diffusion process |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3236642A (is") |
| BE (1) | BE608384A (is") |
| CH (1) | CH413595A (is") |
| DE (1) | DE1124355B (is") |
| GB (1) | GB950668A (is") |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5009984A (en) * | 1988-08-09 | 1991-04-23 | Agfa-Gevaert, N.V. | Method for processing a photographic silver halide emulsion material |
| EP0398750A3 (en) * | 1989-05-18 | 1992-03-18 | Eastman Kodak Company | Tone controlling compounds |
| US5206115A (en) * | 1991-05-20 | 1993-04-27 | Fuji Photo Film Co., Ltd. | Silver salt diffusion transfer image-forming process |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE605802A (is") * | 1961-07-06 | |||
| GB8923906D0 (en) * | 1989-10-24 | 1989-12-13 | Kodak Ltd | Tone controlling compounds |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB753434A (en) * | 1953-09-29 | 1956-07-25 | Gevaert Photo Prod Nv | Improvements in or relating to photographic material |
| GB783793A (en) * | 1955-01-03 | 1957-10-02 | Gevaert Photo Prod Nv | Improvements in or relating to the photographic diffusion-transfer process |
| US2901351A (en) * | 1954-12-10 | 1959-08-25 | Gavaert Photo Producten N V | Direct positive photographic material |
| GB867174A (en) * | 1958-12-15 | 1961-05-03 | Gevaert Photo Prod Nv | Improvements in or relating to the photographic diffusion transfer process |
| US3017270A (en) * | 1958-03-31 | 1962-01-16 | Eastman Kodak Co | Photographic silver halide diffusion transfer process |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE542151A (is") * | 1955-10-19 |
-
0
- BE BE608384D patent/BE608384A/xx unknown
-
1960
- 1960-09-24 DE DEA35652A patent/DE1124355B/de active Pending
-
1961
- 1961-09-12 US US137491A patent/US3236642A/en not_active Expired - Lifetime
- 1961-09-19 CH CH1084661A patent/CH413595A/de unknown
- 1961-09-22 GB GB34057/61A patent/GB950668A/en not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB753434A (en) * | 1953-09-29 | 1956-07-25 | Gevaert Photo Prod Nv | Improvements in or relating to photographic material |
| US2901351A (en) * | 1954-12-10 | 1959-08-25 | Gavaert Photo Producten N V | Direct positive photographic material |
| GB783793A (en) * | 1955-01-03 | 1957-10-02 | Gevaert Photo Prod Nv | Improvements in or relating to the photographic diffusion-transfer process |
| US3017270A (en) * | 1958-03-31 | 1962-01-16 | Eastman Kodak Co | Photographic silver halide diffusion transfer process |
| GB867174A (en) * | 1958-12-15 | 1961-05-03 | Gevaert Photo Prod Nv | Improvements in or relating to the photographic diffusion transfer process |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5009984A (en) * | 1988-08-09 | 1991-04-23 | Agfa-Gevaert, N.V. | Method for processing a photographic silver halide emulsion material |
| EP0398750A3 (en) * | 1989-05-18 | 1992-03-18 | Eastman Kodak Company | Tone controlling compounds |
| US5206115A (en) * | 1991-05-20 | 1993-04-27 | Fuji Photo Film Co., Ltd. | Silver salt diffusion transfer image-forming process |
Also Published As
| Publication number | Publication date |
|---|---|
| BE608384A (is") | |
| GB950668A (en) | 1964-02-26 |
| DE1124355B (de) | 1962-02-22 |
| CH413595A (de) | 1966-05-15 |
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