US2901351A - Direct positive photographic material - Google Patents
Direct positive photographic material Download PDFInfo
- Publication number
- US2901351A US2901351A US551458A US55145855A US2901351A US 2901351 A US2901351 A US 2901351A US 551458 A US551458 A US 551458A US 55145855 A US55145855 A US 55145855A US 2901351 A US2901351 A US 2901351A
- Authority
- US
- United States
- Prior art keywords
- group
- emulsion
- photographic material
- direct positive
- formula
- 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
- 239000000463 material Substances 0.000 title claims description 18
- 239000000839 emulsion Substances 0.000 claims description 37
- -1 SILVER HALIDE Chemical class 0.000 claims description 28
- 229910052709 silver Inorganic materials 0.000 claims description 22
- 239000004332 silver Substances 0.000 claims description 22
- 150000001875 compounds Chemical class 0.000 claims description 19
- 108010010803 Gelatin Proteins 0.000 claims description 15
- 229920000159 gelatin Polymers 0.000 claims description 15
- 239000008273 gelatin Substances 0.000 claims description 15
- 235000019322 gelatine Nutrition 0.000 claims description 15
- 235000011852 gelatine desserts Nutrition 0.000 claims description 15
- 239000000047 product Substances 0.000 description 24
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 15
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 14
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 13
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000000243 solution Substances 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 229910001961 silver nitrate Inorganic materials 0.000 description 7
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- 150000005840 aryl radicals Chemical group 0.000 description 6
- 125000000732 arylene group Chemical group 0.000 description 6
- 239000000155 melt Substances 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- 229910021607 Silver chloride Inorganic materials 0.000 description 5
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 5
- 125000000217 alkyl group Chemical group 0.000 description 4
- 125000003118 aryl group Chemical group 0.000 description 4
- 238000009835 boiling Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- HOLVRJRSWZOAJU-UHFFFAOYSA-N [Ag].ICl Chemical compound [Ag].ICl HOLVRJRSWZOAJU-UHFFFAOYSA-N 0.000 description 3
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical compound CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 description 3
- 235000019441 ethanol Nutrition 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 3
- KZOYOWHFCLDEAN-UHFFFAOYSA-N (2-methyl-4-oxopentan-2-yl) thiocyanate Chemical compound CC(=O)CC(C)(C)SC#N KZOYOWHFCLDEAN-UHFFFAOYSA-N 0.000 description 2
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 2
- OQEBBZSWEGYTPG-UHFFFAOYSA-N 3-aminobutanoic acid Chemical compound CC(N)CC(O)=O OQEBBZSWEGYTPG-UHFFFAOYSA-N 0.000 description 2
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- SJOOOZPMQAWAOP-UHFFFAOYSA-N [Ag].BrCl Chemical compound [Ag].BrCl SJOOOZPMQAWAOP-UHFFFAOYSA-N 0.000 description 2
- 125000003710 aryl alkyl group Chemical group 0.000 description 2
- IOJUPLGTWVMSFF-UHFFFAOYSA-N benzothiazole Chemical compound C1=CC=C2SC=NC2=C1 IOJUPLGTWVMSFF-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 150000004820 halides Chemical class 0.000 description 2
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 2
- RKJUIXBNRJVNHR-UHFFFAOYSA-N indolenine group Chemical group N1=CCC2=CC=CC=C12 RKJUIXBNRJVNHR-UHFFFAOYSA-N 0.000 description 2
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- TXUICONDJPYNPY-UHFFFAOYSA-N (1,10,13-trimethyl-3-oxo-4,5,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-17-yl) heptanoate Chemical compound C1CC2CC(=O)C=C(C)C2(C)C2C1C1CCC(OC(=O)CCCCCC)C1(C)CC2 TXUICONDJPYNPY-UHFFFAOYSA-N 0.000 description 1
- HCTZYGGLKQYBKK-UHFFFAOYSA-N (2,4,6-trinitrophenyl)hydrazine Chemical compound NNC1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O HCTZYGGLKQYBKK-UHFFFAOYSA-N 0.000 description 1
- WCFAPJDPAPDDAQ-UHFFFAOYSA-N 1,2-dihydropyrimidine Chemical compound C1NC=CC=N1 WCFAPJDPAPDDAQ-UHFFFAOYSA-N 0.000 description 1
- NXHSSIGRWJENBH-UHFFFAOYSA-N 1-isothiocyanato-4-nitrobenzene Chemical compound [O-][N+](=O)C1=CC=C(N=C=S)C=C1 NXHSSIGRWJENBH-UHFFFAOYSA-N 0.000 description 1
- HIXDQWDOVZUNNA-UHFFFAOYSA-N 2-(3,4-dimethoxyphenyl)-5-hydroxy-7-methoxychromen-4-one Chemical compound C=1C(OC)=CC(O)=C(C(C=2)=O)C=1OC=2C1=CC=C(OC)C(OC)=C1 HIXDQWDOVZUNNA-UHFFFAOYSA-N 0.000 description 1
- JKFYKCYQEWQPTM-UHFFFAOYSA-N 2-azaniumyl-2-(4-fluorophenyl)acetate Chemical compound OC(=O)C(N)C1=CC=C(F)C=C1 JKFYKCYQEWQPTM-UHFFFAOYSA-N 0.000 description 1
- ZVNPWFOVUDMGRP-UHFFFAOYSA-N 4-methylaminophenol sulfate Chemical compound OS(O)(=O)=O.CNC1=CC=C(O)C=C1.CNC1=CC=C(O)C=C1 ZVNPWFOVUDMGRP-UHFFFAOYSA-N 0.000 description 1
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- WVVOBOZHTQJXPB-UHFFFAOYSA-N N-anilino-N-nitronitramide Chemical compound [N+](=O)([O-])N(NC1=CC=CC=C1)[N+](=O)[O-] WVVOBOZHTQJXPB-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910021612 Silver iodide Inorganic materials 0.000 description 1
- 229910021626 Tin(II) chloride Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 150000001555 benzenes Chemical class 0.000 description 1
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 1
- WCZVZNOTHYJIEI-UHFFFAOYSA-N cinnoline Chemical compound N1=NC=CC2=CC=CC=C21 WCZVZNOTHYJIEI-UHFFFAOYSA-N 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 244000144992 flock Species 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- KIWUVOGUEXMXSV-UHFFFAOYSA-N rhodanine Chemical class O=C1CSC(=S)N1 KIWUVOGUEXMXSV-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical group 0.000 description 1
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 description 1
- 229940045105 silver iodide Drugs 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000001119 stannous chloride Substances 0.000 description 1
- 235000011150 stannous chloride Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
- C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
- C07D239/20—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
- C07D239/22—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with hetero atoms directly attached to ring carbon atoms
-
- 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
- G03C1/00—Photosensitive materials
- G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
- G03C1/485—Direct positive emulsions
- G03C1/48592—Positive image obtained by various effects other than photohole bleaching or internal image desensitisation, e.g. Sabatier, Clayden effect
Definitions
- This invention relates to light-sensitive photographic material and particularly to direct positive photographic material.
- Herschel-effect is known under the name' of Herschel-effect and may be used for obtaining a reversed image.
- .3 lt is'also known that desensitizing dyes y be added to the emulsion in order to increase the Herschel-effect.
- A a member selected from the group consisting of a single bond and NH, l
- B a member selected from the ,group consisting of aryl substituted with at least one:nitrogroup, arylene symmetrically substituted by at least one nitro;group', and arylene-SO -arylene substituted symmetrically by at least two nitro groups, the arylene and arylene-SO arylene groups constituting the centre of a symmetrical compound containing two dihydropyrimidine nuclei of one of the above tautomericformulae,"
- R a member selected from the group consisting of hydrogen, hydroxyl, alkyl, aralky'l and aryl,
- R a member selected from the group consisting of hydrogen, alkyl, aralkyl and aryl, V
- R a member selected from the group consisting of hydrogen, alkyl, aralkyl and aryl.
- the compounds may be incorporated in silver chloride, silver chloro-iodide or silver chloro-bromide emulsions.
- the optimum amount is between 25 mg. and 7.5 g. per equivalent of g. silver nitrate.
- the compounds according to the present invention may also be addedv to alayer which is adjacent to the emulsion. In general, the same, amounts per square metre are used.
- the emulsion is prefogged by light or chemical means, for example by formaldehyde or.stannous chloride. 7
- E mp 1 200 ml. of a 0.5%'solution methyl alcohol of the compound according to the formula are added to 1 kg. of a silver chloride emulsion containing the equivalent of 30 g. silver nitrate. Then this emulsion is coated on, a paper support and exposed to white light suflicient to'giving a density of at least 1.4 when developed in the following developer:
- the product of the formulaslast above given is prepared. as follows: 47.42 g. 2-4 dinitrophenylhydrazine are 'dissolved in 600 ml. dioxane, 39 g. 2-methyl-2-thiocyano-4-pentanone are added and the whole is refluxed for '3 hours. After-cooling, the solution is poured in water, the precipitate issucked off and washed with water-and cold ethyl. alcoliol; The precipitate is further washed with 500" ml. hydrochloric acid (2 N) whilst stirring, and, finally with water. The product melts, after recrystallization in acetic acid, at ;2-15 -21 7 C.
- Example 3 A gelatin upper layer 1.5% gelatin) whereto previously 100 ml. per litre of a 0.5% solution in diacetone aleohohofthe compound. according to the formula are added, is coated on a silver chloro-iodide emulsion 1% iodide) containing the equivalent of 20 g. silver nitrate per kg. The obtained photographic material is further treated as in Example 1.
- the product according to the formula last above given is prepared as follows: to a solution of 3.6 g. p-nitrophenyl-isothiocyanate in 20 ml. benzene, a solution of 1.68 g. beta-amino-butyric acid nitrile in 10 ml. benzene is added. After 30 minutes heating on the boiling water bath, the formed oil solidifies. After cooling, sucking off and recrystallizing in ethyl alcohol, a product according to the formula is obtained which melts at 13 8-139 C. 3.2 g. of product are refluxed for minutes in 30 strong hydrochloric acid. First the whole dissolves and after some time boiling a precipitate is formed. After-cooling, sucking off and recrystallizing in acetic acid, the desired product is obtained under the form offsmall white needles melting at 237--239 C.
- Example 5 Example 5 .50 ml. of a 0.5% solution in dioxane of the pound according to the formula are added to 1 kg. silver chloride emulsion containing the equivalent of 25 g. silver nitrate. Next, the emulsion is coated on a paper support. The photographic material obtained is further treated as in Example 1.
- the product according to the formula last above given is prepared as follows: 1.2 g. picryl hydrazine are dissolved in 60 ml. hydrochloric acid (5 N). Next, 0.78 g. 2-methyl-2-thiocyano-pentanone-(4) are added. The whole is boiled for 1 hour. After cooling, and standing overnight, the obtained product is sucked off, washed with water and recrystallized in acetic acid.
- Example 6 4 kg. of a silver chloro-bromide emulsion (10% bromide) containing the equivalent of 20 g. silver nitrate per kg. are heated to 40 C. and-brought at a pH of 8. Next, 8 ml. of an aqueous solution of formaldehyde (40%) are added and the emulsion is kept for 10 minutes at the same temperature. The pH is brought at 6 and 100 ml. of a 0.5% solution in diactone alcohol of the product according to the formula :are added. Then, the emulsion is coated on a film support. This chemically fogged emulsionis exposed to an a image through a Gevalor filter L 500.
- Example 1 The photographic material obtained is further treated as in Example 1.
- the product of the formula last above given is prepared as follows: 4.56 g. I-S-dinitro-4-6-hydrazino benzene are heated in 150 ml. water for 4 hours on the boiling water bath with 6.28 g. 2-methyl-2-thiocyano-4- pentanone. After, cooling and sucking off, the product obtained is washed with water, hydrochloric acid (2 N), water, ethyl alcohol and ether respectively. After recrystallization in acetic acid, the obtained product melts at 223-224 C.
- a direct positive silver halide photographic material comprising a silver halide emulsion layer and a gelatin layer adjacent thereto, the gelatin layer containing the product of the formula .6 2.
- a direct positive photographic material comprising CH (5 NO i NO: (I) 3 a MHGSOGNH a...
- a direct positive silver halide photographic material comprising a silver halide emulsion layer and a gelatin layer adjacent thereto, the gelatin layer containing the product of the formula 4.
- a direct positive photographic material comprising a silver halide emulsion containing the product of the 5.
- a direct, positive silver halide photographic material comprising a silver halide emulsion layer and a gelatin layer adjacent thereto, the gelatin layer containing the product of the-formula 6.
- a direct positive photographic material comprising a silver halide emulsion containing the product of the formula t it 11.75 7.
- a direct positive photographic material comprisihg a--silver halide emulsion containing the-producbof the formula 1 '9.
- a direct positive silver halide photographic material comprising a silver halide "emulsion layer and a gelatin layer adjacent thereto, the gelatin layer-containing the product of the formula 10.
- a direct positive silver halide photographic material comprising an unsensitive gelatin layer adjacent to the silver halide emulsion, said layer containing the product of the formula 11.
- a direct positive silver halide photographic material comprising arsilver halide emulsion layer and a gelatin layer adjacent thereto, at least one of said layers containing a compound selected from the group consisting of compounds corresponding to one of the tautomeric formulae:
- A represents a member: selected from the group consisting of a single bond and''NH-
- B represents an aryl radical substituted with at lea stone 'nitro group
- D represents a 'memberselcctedfrom the group consisting of an arylene radical s'ubstituted'with at least one nitro group, and an arylene-*SOy'arylene radical, each arylene group of which is substituted with-at least one nitro group
- R and R each represents a member selected from the group consisting of a hydroxyl radical and an alkyl radical
- R represents a member selected from the group consisting of a hydrogen atom, an alkyl radical, and an aryl radical.
- A represents a member selected from the group consisting of a single bond and NH-
- B represents an aryl radical substituted with at least one nitro group
- D represents a member selected from the group consisting of an arylene radical substituted with at least one nitro group, and an arylene-sO -arylene radical, each arylene group of which is substituted.
- R and R each represents a member selected from the group consisting of a hydroxyl radical and an alkyl radical
- R represents a member selected from the group consisting of a hydrogen atom, an alkyl radical, and an aryl radical.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB35797/54A GB796873A (en) | 1954-12-10 | 1954-12-10 | Improvements in or relating to photographic emulsions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2901351A true US2901351A (en) | 1959-08-25 |
Family
ID=10381638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US551458A Expired - Lifetime US2901351A (en) | 1954-12-10 | 1955-12-06 | Direct positive photographic material |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2901351A (is") |
| BE (1) | BE543288A (is") |
| DE (1) | DE1019171B (is") |
| FR (1) | FR1136718A (is") |
| GB (1) | GB796873A (is") |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3148066A (en) * | 1961-06-29 | 1964-09-08 | Eastman Kodak Co | Nitramino and nitrosamino compounds as antifoggants for photographic emulsions |
| US3236642A (en) * | 1960-09-24 | 1966-02-22 | Agfa Ag | Process for producing direct positives by the silver salt diffusion process |
| US3367779A (en) * | 1965-01-21 | 1968-02-06 | Fuji Photo Film Co Ltd | Direct positive silver halide photographic materials |
| US3652277A (en) * | 1968-07-23 | 1972-03-28 | Fuji Photo Film Co Ltd | Processing for photographic silver halide light-sensitive element |
| US3717466A (en) * | 1970-04-01 | 1973-02-20 | Agfa Gevaert Nv | Fogged direct positive silver halide element containing a selenium compound sensitizer |
| US3779776A (en) * | 1971-07-30 | 1973-12-18 | Agfa Gevaert Nv | Fogged, direct-positive silver halide emulsion containing a color coupler and a heterocyclic mercaptan desensitizer |
| US3910795A (en) * | 1972-12-19 | 1975-10-07 | Fuji Photo Film Co Ltd | Fogged, direct positive silver halide emulsion sensitized with a nitrophenyl mercapto heterocyclic compound |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE576568A (is") * | 1958-03-11 | |||
| US3519428A (en) * | 1965-05-21 | 1970-07-07 | Keuffel & Esser Co | Direct-positive light-sensitive photographic material |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2139870A (en) * | 1935-08-31 | 1938-12-13 | Agfa Ansco Corp | Photographic developers |
| US2173628A (en) * | 1936-11-07 | 1939-09-19 | Ilford Ltd | Stabilization of photographic sensitive materials |
| US2231127A (en) * | 1937-12-22 | 1941-02-11 | Ilford Ltd | Stabilization of photographic emulsions |
| GB601824A (en) * | 1945-10-04 | 1948-05-13 | Elliott & Sons Ltd | Improvements in photographic light sensitive emulsions |
| GB707704A (en) * | 1952-03-20 | 1954-04-21 | Ilford Ltd | Improvements in or relating to direct positive photographic emulsions |
-
0
- BE BE543288D patent/BE543288A/xx unknown
-
1954
- 1954-12-10 GB GB35797/54A patent/GB796873A/en not_active Expired
-
1955
- 1955-12-06 US US551458A patent/US2901351A/en not_active Expired - Lifetime
- 1955-12-09 DE DEG18553A patent/DE1019171B/de active Pending
- 1955-12-09 FR FR1136718D patent/FR1136718A/fr not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2139870A (en) * | 1935-08-31 | 1938-12-13 | Agfa Ansco Corp | Photographic developers |
| US2173628A (en) * | 1936-11-07 | 1939-09-19 | Ilford Ltd | Stabilization of photographic sensitive materials |
| US2231127A (en) * | 1937-12-22 | 1941-02-11 | Ilford Ltd | Stabilization of photographic emulsions |
| GB601824A (en) * | 1945-10-04 | 1948-05-13 | Elliott & Sons Ltd | Improvements in photographic light sensitive emulsions |
| GB707704A (en) * | 1952-03-20 | 1954-04-21 | Ilford Ltd | Improvements in or relating to direct positive photographic emulsions |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3236642A (en) * | 1960-09-24 | 1966-02-22 | Agfa Ag | Process for producing direct positives by the silver salt diffusion process |
| US3148066A (en) * | 1961-06-29 | 1964-09-08 | Eastman Kodak Co | Nitramino and nitrosamino compounds as antifoggants for photographic emulsions |
| US3367779A (en) * | 1965-01-21 | 1968-02-06 | Fuji Photo Film Co Ltd | Direct positive silver halide photographic materials |
| US3652277A (en) * | 1968-07-23 | 1972-03-28 | Fuji Photo Film Co Ltd | Processing for photographic silver halide light-sensitive element |
| US3717466A (en) * | 1970-04-01 | 1973-02-20 | Agfa Gevaert Nv | Fogged direct positive silver halide element containing a selenium compound sensitizer |
| US3779776A (en) * | 1971-07-30 | 1973-12-18 | Agfa Gevaert Nv | Fogged, direct-positive silver halide emulsion containing a color coupler and a heterocyclic mercaptan desensitizer |
| US3910795A (en) * | 1972-12-19 | 1975-10-07 | Fuji Photo Film Co Ltd | Fogged, direct positive silver halide emulsion sensitized with a nitrophenyl mercapto heterocyclic compound |
Also Published As
| Publication number | Publication date |
|---|---|
| BE543288A (is") | |
| DE1019171B (de) | 1957-11-07 |
| GB796873A (en) | 1958-06-18 |
| FR1136718A (fr) | 1957-05-17 |
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