US2179228A - Process of color photography and material therefor - Google Patents
Process of color photography and material therefor Download PDFInfo
- Publication number
- US2179228A US2179228A US10704A US1070435A US2179228A US 2179228 A US2179228 A US 2179228A US 10704 A US10704 A US 10704A US 1070435 A US1070435 A US 1070435A US 2179228 A US2179228 A US 2179228A
- Authority
- US
- United States
- Prior art keywords
- layer
- gelatin
- solution
- component
- picture
- 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 description 20
- 239000000463 material Substances 0.000 title description 11
- 229920000159 gelatin Polymers 0.000 description 38
- 235000019322 gelatine Nutrition 0.000 description 38
- 108010010803 Gelatin Proteins 0.000 description 32
- 239000008273 gelatin Substances 0.000 description 32
- 235000011852 gelatine desserts Nutrition 0.000 description 32
- 229910052709 silver Inorganic materials 0.000 description 30
- 239000004332 silver Substances 0.000 description 30
- 239000000243 solution Substances 0.000 description 29
- 239000000839 emulsion Substances 0.000 description 26
- 150000001875 compounds Chemical class 0.000 description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 21
- 230000008878 coupling Effects 0.000 description 18
- 238000010168 coupling process Methods 0.000 description 18
- 238000005859 coupling reaction Methods 0.000 description 18
- -1 silver halide Chemical class 0.000 description 16
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 15
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 15
- 239000000975 dye Substances 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 description 7
- 235000011121 sodium hydroxide Nutrition 0.000 description 7
- 239000001828 Gelatine Substances 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 6
- 150000008049 diazo compounds Chemical class 0.000 description 6
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000000987 azo dye Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 235000013877 carbamide Nutrition 0.000 description 4
- 238000004043 dyeing Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000004061 bleaching Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 235000010288 sodium nitrite Nutrition 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 150000001735 carboxylic acids Chemical class 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000006193 diazotization reaction Methods 0.000 description 2
- IYYZUPMFVPLQIF-UHFFFAOYSA-N dibenzothiophene Chemical compound C1=CC=C2C3=CC=CC=C3SC2=C1 IYYZUPMFVPLQIF-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 125000000962 organic group Chemical group 0.000 description 2
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 2
- 239000001044 red dye Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 150000003672 ureas Chemical class 0.000 description 2
- TXVWTOBHDDIASC-UHFFFAOYSA-N 1,2-diphenylethene-1,2-diamine Chemical class C=1C=CC=CC=1C(N)=C(N)C1=CC=CC=C1 TXVWTOBHDDIASC-UHFFFAOYSA-N 0.000 description 1
- KJCVRFUGPWSIIH-UHFFFAOYSA-N 1-naphthol Chemical compound C1=CC=C2C(O)=CC=CC2=C1 KJCVRFUGPWSIIH-UHFFFAOYSA-N 0.000 description 1
- RUFPHBVGCFYCNW-UHFFFAOYSA-N 1-naphthylamine Chemical compound C1=CC=C2C(N)=CC=CC2=C1 RUFPHBVGCFYCNW-UHFFFAOYSA-N 0.000 description 1
- KJKBAKXVJKBGGV-UHFFFAOYSA-N 2-hydroxy-11H-naphtho[2,1-a]carbazole-1-carboxylic acid Chemical compound OC1=C(C=2C=CC3=C(C=CC=4C=5C=CC=CC5NC34)C2C=C1)C(=O)O KJKBAKXVJKBGGV-UHFFFAOYSA-N 0.000 description 1
- UPHOPMSGKZNELG-UHFFFAOYSA-N 2-hydroxynaphthalene-1-carboxylic acid Chemical compound C1=CC=C2C(C(=O)O)=C(O)C=CC2=C1 UPHOPMSGKZNELG-UHFFFAOYSA-N 0.000 description 1
- WHSXTWFYRGOBGO-UHFFFAOYSA-N 3-methylsalicylic acid Chemical compound CC1=CC=CC(C(O)=O)=C1O WHSXTWFYRGOBGO-UHFFFAOYSA-N 0.000 description 1
- QBPAUIDFWFXLKB-UHFFFAOYSA-N 9h-carbazol-1-ol Chemical compound N1C2=CC=CC=C2C2=C1C(O)=CC=C2 QBPAUIDFWFXLKB-UHFFFAOYSA-N 0.000 description 1
- VESMRDNBVZOIEN-UHFFFAOYSA-N 9h-carbazole-1,2-diamine Chemical compound C1=CC=C2C3=CC=C(N)C(N)=C3NC2=C1 VESMRDNBVZOIEN-UHFFFAOYSA-N 0.000 description 1
- 241001479434 Agfa Species 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-N Carbamic acid Chemical class NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 1
- 101100391182 Dictyostelium discoideum forI gene Proteins 0.000 description 1
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 description 1
- 206010070834 Sensitisation Diseases 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 229940051880 analgesics and antipyretics pyrazolones Drugs 0.000 description 1
- 229940051881 anilide analgesics and antipyretics Drugs 0.000 description 1
- 150000003931 anilides Chemical class 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
- 125000003236 benzoyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C(*)=O 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- HLVXFWDLRHCZEI-UHFFFAOYSA-N chromotropic acid Chemical compound OS(=O)(=O)C1=CC(O)=C2C(O)=CC(S(O)(=O)=O)=CC2=C1 HLVXFWDLRHCZEI-UHFFFAOYSA-N 0.000 description 1
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 1
- 150000001989 diazonium salts Chemical class 0.000 description 1
- TXCDCPKCNAJMEE-UHFFFAOYSA-N dibenzofuran Chemical compound C1=CC=C2C3=CC=CC=C3OC2=C1 TXCDCPKCNAJMEE-UHFFFAOYSA-N 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- AJDUTMFFZHIJEM-UHFFFAOYSA-N n-(9,10-dioxoanthracen-1-yl)-4-[4-[[4-[4-[(9,10-dioxoanthracen-1-yl)carbamoyl]phenyl]phenyl]diazenyl]phenyl]benzamide Chemical compound O=C1C2=CC=CC=C2C(=O)C2=C1C=CC=C2NC(=O)C(C=C1)=CC=C1C(C=C1)=CC=C1N=NC(C=C1)=CC=C1C(C=C1)=CC=C1C(=O)NC1=CC=CC2=C1C(=O)C1=CC=CC=C1C2=O AJDUTMFFZHIJEM-UHFFFAOYSA-N 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- JEXVQSWXXUJEMA-UHFFFAOYSA-N pyrazol-3-one Chemical class O=C1C=CN=N1 JEXVQSWXXUJEMA-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- 229940100890 silver compound Drugs 0.000 description 1
- 150000003379 silver compounds Chemical class 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000001043 yellow dye Substances 0.000 description 1
Images
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
- G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
- G03C7/46—Subtractive processes not covered by the group G03C7/26; Materials therefor; Preparing or processing such materials
Definitions
- Our present invention relates to color photography.
- anilides or the like These compounds are to be nely dispersed, forI example, by introducinginto the gelatin an alcoholic solution of the compound which is insoluble inwater, so that the' compound is precipitated in the photographic layer. In this manner it is possible to incorporate the compounds in the gelatin in such a fine state of distribution that notwithstanding the insolubility of the compound in water the gelatin dries to a, transparent layer.
- Another procedure for adding dyestuff components to the gelatin in water insoluble form makes use of coupling components which can be fixed by mordanting.
- Such coupling components for example, naphthol,
- chromotropic acid or the like can be xed on the gelatin with the aid of a metal oxide and provided that the component has a suitable constitution the gelatin will dry to a layer clear as glass.
- the present invention is based on the dis covery that it is possible to incorporate in the photographic layer azocomponents from aqueous solutions in such a manner thatv they are resistant towards the usual photographic baths by choosing those azo-dyestuff components which have substantive properties with respect to the layer.
- azo-dyestuff components which have substantive properties with respect to the layer.
- the addition of these substantive comu pounds naturally does not in any way impair the served, since in contrast Vto other processes the compounds are not distributed heterogeneously inthe layer but are actually dissolved in the gelatin.
- The' procedure for carrying out the invention may consist for example, in adding to a solution of gelatin or the like a solution of an azo-component or ,diazo-component which is substantive towards gelatin, whereuponthe gelatin is thoroughly washed with water and then worked up in the usualmanner. It is also possible totreat algelatin layer o1 a foil of gelatin with a solution of one ofthe aforesaid dyestui components. ln both cases the gelatin, in the language of the dyeing industry, is dyed by the dyestuff component even though in the case of a colorless component the layer does not acquire a color which can be perceived by the eye. Y
- gelatin which has been rtreated. with Vboth dyestui components may be worked up into a silver halide emulsion. .After exposure the silver image is bleached in a bleaching bath which at the same time tans and hardens the gelatin .atthe exposedparts of the layer. If now the layer is treated with an acidifled solution of sodium nitrite, Adiasotization and formation of a dyestuif occur at thoseparts of the picture area which are ⁇ not hardened and are therefore accessible to the action of the nitrite solution.
- Another procedure may consist in dyeing the gelatin only with the azocomponent and then either converting the silver image into an anti-diazotate image (for vexample according to U. S. Patent No. 1,963,197) or caus- 5 ing the silver halide to adsorb a diazonium compound and after washing forming the dyestui in a coupling bath.
- the gelatin is dyed with di-ortho-sulfobenzylidene-4:4diami nodiphenylurea corresponding with the formula S 03H B 01H a yellow picture may be obtained by means o! the anti-diazotate of -naphthylamine.
- arylides similarly constituted hydroxycarboxylic acid amides, for instance, arylides of 2:3-hydroxyanthracenic acid, arylides o of hydroxycarbazole carbonio acid, arylides of 0 hydroxynaphthocarbazole carboxylic acid (a.
- compound of this group corresponds with the formula C O--NH or arylides of terephthalacetic acid (a compound of this group corresponds with the formula arylides of the hydroxycarboxylic acid of diphenylene oxide and diphenylene sulfide (compounds of this group corresponds with the formulae on oom v (Jo-NH@ CEs' on ci s (Jo-NH@ furthermore the arylides of -naphthindole-2- 50 phenyl-7-hydroxycarboxylic acid (a compound of this group corresponds with the formula and as well as pyrazolones from Z-p-aminophenylthiazoles (a compound of this group corresponds with the formula NBC-CH:
- a furth'er procedure in accordance with the invention consists in dyeing the gelatin with both dyestuff components and then converting the silver image into an insoluble nitrite compound.
- a. red picture may be produced, for example, from the urea from para-dimethylaminobenzoyl-para-aminobenzoyl-2-amino--naph- 15 thol-'I-sulfonic acid corresponding with the formula Ho, NH-coONn-oo-Omcnm pounds of aminonaphthol sulfonic and carboxylic acids (a compound of this group corresponds with the formula -O-NH-oo-O-Nm) of naphthylamine sulfonlc and carboxylic acids (a compound of this group corresponds with the formula of cresotinic acid and of diaminocarbazole disul- 4 ionic acid (a.
- the invention is of particular importance in its application to the production of photographs 35 in natural colors. If there are cast in superimposed relationship emulsions of which each vis sensitized for one of the primary colors and is dyed with appropriate dyestuff components, the
- color synthesis can be conducted in the layers in ample, in the case of a three-color rllm two color images may be produced on one side of the support byI the process of the invention, whereas the remaining color image may be produced, for example, on the other side of the support by toning or on the same side by an imbib-ition process.
- the invention comprises a photographic material consisting of a support coated on one or both sides with one or more layers of silver halide gelatin emulsion which is or are dyed with an azo-dyestuff component or components substantive with respect to the layer.
- Example 1 A nlm coated with a layer of gelatin is bathed in the following solution:
- the material is Washed with Water for about 1/2 hour. Then the sheet is bathed in a solution of p-diphenylamindiazonium sulfate and is dried. After exposure under an original and treatment with an aqueous solution of ammonia or gazeous ammonia a blue picture is produced at the places which were not illuminated.
- Example 2 l There is produced a solution of 10grams of p-dimethylamidobenzoyl-p-amidobenzoyl-(2-amino-5-naphthol-7-sulfonic acid) in 1000 cc. of water, with the addition of 10 cc. of a causticsoda solution of 20% strength.
- a silver bromide emulsion layer is bathed for 10 minutes and washed with water for about 1 hour.
- An original is printed on this layer, and the layer developed, fixed and the silver image bleached by means of copper chloride.
- the bleached-out silver image is converted into naphthylamine-antidiazotate-si 1v e r 'by means ol an alkaline solution of -naphthylamine-antidiazotate-sodium and t h o r o u g h l y Washed.v
- this picture is immersed into a solution of 1 gram of citric acid and 1 gram of potassium bromide, a red azo-dye picture is produced. The silver bromide is removed by fixing.
- the solution is filtered and mixed with a solution of grams of urea-bis-(p-amidobenzoyl-pphenylenediamine sulionic acid) in a quantity of Water as small as possible and a small amount oi caustic soda solution; a silver bromide emulsion layer is bathed therein for about 10 minutes,
- Example d l00 cc. of silver bromide emulsion are mixed with a solution of 0.5 gram of 2.3-hydroxynaphthoic-acid-a-naphthalide in l0 cc. of a caustic soda solution of 5% strength.
- Example 5 (a) l kilo of silver bromide emulsion is mixed with 5 grams of 2.3-hydroxynaphthoic-aci d-dianisidine dissolved in cc. of methanol 5 cc. of a caustic soda solution of 20% strength and neutralized with 15 cc. of acetic acid of 10% strength. This emulsion is sensitized for green.
- the support a is provided with a photographic layer dyed with a compound having substantive properties with respect thereto.
- a process of producing color photographs which comprises incorporating in a silver halide gelatin emuisiona coupling component of an azo dye, said coupling component having a chemical constitution which imparts to said component substantive properties towards the gelatin, forming a light-sensitive layer from said emulsion, exposing said layer to light controlled by an lobject tobe reproduced, developing the latent silver image, and causing said coupling component to react with a diazo compound, thereby producing an aZo-dyestuff picture in situ with the silver picture.
- A'process of producing color photographs which-comprises treating a silver halide emulsion layer with a solution of a coupling component of an azo dye, said coupling component having a constitution which imparts thereto substantive properties towards the gelatin, forming a light-A sensitive layer from said emulsion, exposing said layer to light controlled by an object to be reproduced, developing the latent silver image, and causing said coupling component to react with a diazo compound, thereby producing an azo-dyestuff picture in situ with the silver picture.
- a process of producing color photographs which comprises treating a gelatin solution containing silver halide with a solution of a coupling component having a chemical constitution which imparts thereto substantive properties with respect to the gelatin, forming a light-sensitive layer from said emulsion, exposing said layer to light controlled by an object to be reproduced, de-
- a light-sensitive photographic element comprising a support and at least one silver halide emulsion layer capable of being converted into a colored picture by exposure to light, development and treatment with a diazo compound, said silver halide emulsion layer containing a coupling component of an azo dye; said coupling component having a chemical constitution which imparts thereto substantive properties with respect to the l which comprises incorporating in a silver halide gelatin emulsion a diazo compound and a coupling component of an azo dye, said diazo compound and said coupling component having a chemical constitution which imparts thereto substantive properties towards gelatin, forming a light-sensitive layer from said emulsion, exposing said layer to light controlled by an object to be reproduced, developing and fixing said layer, bleaching said layer in a bath which has at the same time a tanning and hardening action on the gelatin of the exposed parts of the layer, and treating said layer with an acidiiied solution of sodium nitrite.
- a light sensitive material for color photography comprising a support and a silver halide gelatine emulsion thereon, containing an organic colorless dyestui component capable of reacting with a further component to produce a dyestui image, said first component having a chemical constitution which imparts thereto substantive properties with respect to the gelatine.
- a light sensitive material for color photography comprising a support and a silver halide gelatine emulsion thereon, containing an organic colorless dyestuff component capable of reacting with a further component to produce a dyestui image, said first component containing an organic group which imparts to said component substantive character with respect to the gelatine.
- a light sensitive material for color photography comprising a support, a plurality of silver halide gelatine emulsions carried by said support, each emulsion containing an' organic colorless dyestui component capable of reacting with a further component to produce 'a dyestuff image diierent in color from that produced in the other layers, said rst component having a chemical constitution which imparts thereto substantive properties with respect to the gelatine.
- a light-sensitive material for color photography comprising a support and a silver halide gelatin emulsion thereon containing an hydroxynaphthoic acid arylide containing an organic group which imparts to said compound substantive character with respect to the gelatin.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (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 |
|---|---|---|---|
| DEI0049281 | 1934-03-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2179228A true US2179228A (en) | 1939-11-07 |
Family
ID=7192525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US10704A Expired - Lifetime US2179228A (en) | 1934-03-16 | 1935-03-12 | Process of color photography and material therefor |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2179228A (enrdf_load_stackoverflow) |
| BE (1) | BE408483A (enrdf_load_stackoverflow) |
| FR (1) | FR787388A (enrdf_load_stackoverflow) |
| GB (1) | GB436587A (enrdf_load_stackoverflow) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2418624A (en) * | 1943-03-02 | 1947-04-08 | Eastman Kodak Co | Azo dyes for color photography |
| US2514233A (en) * | 1940-08-08 | 1950-07-04 | Chromogen Inc | Process for the manufacture of golor photographic images |
| US2653874A (en) * | 1949-04-15 | 1953-09-29 | Bela Gaspar | Process for the production of color photographic images |
-
0
- BE BE408483D patent/BE408483A/xx unknown
-
1934
- 1934-04-05 GB GB10326/34A patent/GB436587A/en not_active Expired
-
1935
- 1935-03-12 US US10704A patent/US2179228A/en not_active Expired - Lifetime
- 1935-03-14 FR FR787388D patent/FR787388A/fr not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2514233A (en) * | 1940-08-08 | 1950-07-04 | Chromogen Inc | Process for the manufacture of golor photographic images |
| US2418624A (en) * | 1943-03-02 | 1947-04-08 | Eastman Kodak Co | Azo dyes for color photography |
| US2653874A (en) * | 1949-04-15 | 1953-09-29 | Bela Gaspar | Process for the production of color photographic images |
Also Published As
| Publication number | Publication date |
|---|---|
| BE408483A (enrdf_load_stackoverflow) | |
| GB436587A (en) | 1935-10-07 |
| FR787388A (fr) | 1935-09-21 |
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