US2770542A - Colour photography - Google Patents
Colour photography Download PDFInfo
- Publication number
- US2770542A US2770542A US307567A US30756752A US2770542A US 2770542 A US2770542 A US 2770542A US 307567 A US307567 A US 307567A US 30756752 A US30756752 A US 30756752A US 2770542 A US2770542 A US 2770542A
- Authority
- US
- United States
- Prior art keywords
- silver
- image
- complex
- bromide
- bleached
- 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
- 229910052709 silver Inorganic materials 0.000 claims description 32
- 239000004332 silver Substances 0.000 claims description 32
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 20
- 239000002253 acid Substances 0.000 claims description 18
- 239000000975 dye Substances 0.000 claims description 18
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 claims description 10
- 150000003842 bromide salts Chemical class 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- 150000001408 amides Chemical class 0.000 claims description 8
- 230000006872 improvement Effects 0.000 claims description 5
- 150000003556 thioamides Chemical class 0.000 claims description 4
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 36
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 20
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 18
- 239000002585 base Substances 0.000 description 11
- -1 thiourea Chemical compound 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 10
- 238000012546 transfer Methods 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 8
- AEOCXXJPGCBFJA-UHFFFAOYSA-N ethionamide Chemical compound CCC1=CC(C(N)=S)=CC=N1 AEOCXXJPGCBFJA-UHFFFAOYSA-N 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 6
- 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 description 6
- 229910052783 alkali metal Inorganic materials 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 150000001340 alkali metals Chemical class 0.000 description 4
- SWLVFNYSXGMGBS-UHFFFAOYSA-N ammonium bromide Chemical compound [NH4+].[Br-] SWLVFNYSXGMGBS-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- AZFKHTAYVUZBIQ-UHFFFAOYSA-N N[Se]N Chemical compound N[Se]N AZFKHTAYVUZBIQ-UHFFFAOYSA-N 0.000 description 3
- 229960000583 acetic acid Drugs 0.000 description 3
- 229910001513 alkali metal bromide Inorganic materials 0.000 description 3
- HRMOLDWRTCFZRP-UHFFFAOYSA-L disodium 5-acetamido-3-[(4-acetamidophenyl)diazenyl]-4-hydroxynaphthalene-2,7-disulfonate Chemical compound [Na+].OC1=C(C(=CC2=CC(=CC(=C12)NC(C)=O)S(=O)(=O)[O-])S(=O)(=O)[O-])N=NC1=CC=C(C=C1)NC(C)=O.[Na+] HRMOLDWRTCFZRP-UHFFFAOYSA-L 0.000 description 3
- 150000004820 halides Chemical class 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000403 monosodium phosphate Inorganic materials 0.000 description 3
- 235000019799 monosodium phosphate Nutrition 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 229910001961 silver nitrate Inorganic materials 0.000 description 3
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 description 3
- RGCKGOZRHPZPFP-UHFFFAOYSA-N Alizarin Natural products C1=CC=C2C(=O)C3=C(O)C(O)=CC=C3C(=O)C2=C1 RGCKGOZRHPZPFP-UHFFFAOYSA-N 0.000 description 2
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 2
- 239000001828 Gelatine Substances 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 2
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- HFVAFDPGUJEFBQ-UHFFFAOYSA-M alizarin red S Chemical compound [Na+].O=C1C2=CC=CC=C2C(=O)C2=C1C=C(S([O-])(=O)=O)C(O)=C2O HFVAFDPGUJEFBQ-UHFFFAOYSA-M 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000009918 complex formation Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 229920000159 gelatin Polymers 0.000 description 2
- 235000019322 gelatine Nutrition 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000012286 potassium permanganate Substances 0.000 description 2
- 238000001226 reprecipitation Methods 0.000 description 2
- 239000001632 sodium acetate Substances 0.000 description 2
- 235000017281 sodium acetate Nutrition 0.000 description 2
- 239000004289 sodium hydrogen sulphite Substances 0.000 description 2
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000001117 sulphuric acid Substances 0.000 description 2
- 235000011149 sulphuric acid Nutrition 0.000 description 2
- XCIDNCPEXLYEOP-UHFFFAOYSA-N 2-oxo-1h-pyrazine-3-carbaldehyde Chemical compound OC1=NC=CN=C1C=O XCIDNCPEXLYEOP-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- RZUBARUFLYGOGC-MTHOTQAESA-L acid fuchsin Chemical compound [Na+].[Na+].[O-]S(=O)(=O)C1=C(N)C(C)=CC(C(=C\2C=C(C(=[NH2+])C=C/2)S([O-])(=O)=O)\C=2C=C(C(N)=CC=2)S([O-])(=O)=O)=C1 RZUBARUFLYGOGC-MTHOTQAESA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- HTKFORQRBXIQHD-UHFFFAOYSA-N allylthiourea Chemical compound NC(=S)NCC=C HTKFORQRBXIQHD-UHFFFAOYSA-N 0.000 description 1
- 229960001748 allylthiourea Drugs 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 229910021502 aluminium hydroxide Inorganic materials 0.000 description 1
- PYKYMHQGRFAEBM-UHFFFAOYSA-N anthraquinone Natural products CCC(=O)c1c(O)c2C(=O)C3C(C=CC=C3O)C(=O)c2cc1CC(=O)OC PYKYMHQGRFAEBM-UHFFFAOYSA-N 0.000 description 1
- 150000004056 anthraquinones Chemical class 0.000 description 1
- 125000000751 azo group Chemical group [*]N=N[*] 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 150000001649 bromium compounds Chemical class 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 125000003636 chemical group Chemical group 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012362 glacial acetic acid Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- CTIQLGJVGNGFEW-UHFFFAOYSA-L naphthol yellow S Chemical compound [Na+].[Na+].C1=C(S([O-])(=O)=O)C=C2C([O-])=C([N+]([O-])=O)C=C([N+]([O-])=O)C2=C1 CTIQLGJVGNGFEW-UHFFFAOYSA-L 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- RWPGFSMJFRPDDP-UHFFFAOYSA-L potassium metabisulfite Chemical compound [K+].[K+].[O-]S(=O)S([O-])(=O)=O RWPGFSMJFRPDDP-UHFFFAOYSA-L 0.000 description 1
- 239000004297 potassium metabisulphite Substances 0.000 description 1
- 235000010263 potassium metabisulphite Nutrition 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- IYKVLICPFCEZOF-UHFFFAOYSA-N selenourea Chemical compound NC(N)=[Se] IYKVLICPFCEZOF-UHFFFAOYSA-N 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical class [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-N sulfonic acid Chemical group OS(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-N 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- UJMBCXLDXJUMFB-GLCFPVLVSA-K tartrazine Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)C1=NN(C=2C=CC(=CC=2)S([O-])(=O)=O)C(=O)C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 UJMBCXLDXJUMFB-GLCFPVLVSA-K 0.000 description 1
- 239000004149 tartrazine Substances 0.000 description 1
- 229960000943 tartrazine Drugs 0.000 description 1
- 235000012756 tartrazine Nutrition 0.000 description 1
- YUKQRDCYNOVPGJ-UHFFFAOYSA-N thioacetamide Chemical compound CC(N)=S YUKQRDCYNOVPGJ-UHFFFAOYSA-N 0.000 description 1
- DLFVBJFMPXGRIB-UHFFFAOYSA-N thioacetamide Natural products CC(N)=O DLFVBJFMPXGRIB-UHFFFAOYSA-N 0.000 description 1
- UJMBCXLDXJUMFB-UHFFFAOYSA-K trisodium;5-oxo-1-(4-sulfonatophenyl)-4-[(4-sulfonatophenyl)diazenyl]-4h-pyrazole-3-carboxylate Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)C1=NN(C=2C=CC(=CC=2)S([O-])(=O)=O)C(=O)C1N=NC1=CC=C(S([O-])(=O)=O)C=C1 UJMBCXLDXJUMFB-UHFFFAOYSA-K 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
- G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
- G03C7/22—Subtractive cinematographic processes; Materials therefor; Preparing or processing such materials
- G03C7/25—Dye-imbibition processes; Materials therefor; Preparing or processing such materials
Definitions
- This invention relates to colour photography and more particularly to improvements in the production of colour records in the production of which thiourea and functionally similar amides and acid dyestuffs are used.
- a process for producing a positive colour record in which a latent silver image is developed in a black and white o'eveloper, the resulting positive image bleached, treated with an aqueous solution of a water-soluble thioamide or selenoamide and with an at least sparingly watergsoluble dyestutf, in which the treatment with thioamide or selenoamide and dyestulf is carried out simultaneously in the presence of a substance which reduces the watersolubility of the silver salt present in the bleached image.
- the treatment is carried out at a pH below 7.
- the said substance is one which in aqueous solution gives rise to the same anion or anions as the silver saltor salts present in the bleached image.
- the effects produced are clearly related to the nature of the product or products formed between the thioamide, the silver halide or halides present and the dyestuff and the influence exerted by other substances present upon the nature of those products.
- the presence of an alkali metal or ammonium bromide in the aqueous mixture of thioamide and dyestutf will depress the solubility of silver bromide and this appears to favour the formation of a type of silver halide-thioamide-dyestuff complex in linear or substantially linear proportion to the amount of silver present in the bleached image and such complex is evidently in such form that the dyestutf can be transferred in a form which becomes substantive in contact with the mordant-carrying permanent base.
- the present process uses a complex as a source from which to produce a mordant image which appears only on the permanent base and the conditions of formation of the substantially insoluble complex are such as to substantially eliminate undesirable side reactions.
- the amide employed in the process may be thiourea, selenourea or a substitution product of either of these, such as allyl thiourea, or thioacetamide.
- the preferred materials for reducing the solubility of the silver salt are the alkali metal and ammonium halides corresponding to the halide or halides present in the bleached silver image, when the bleached image contains silver bromide.
- any acid dyestuff which will provide an image of the desired hue and form an insoluble complex under the reaction conditions may be employed.
- the dyestuffs may, and in general will, be selected from different chemical groups, for example, azo, pyrazalone and anthraquinone dyestuffs and will have one or more groups which impart appreciable water-solubility, e. g. carboxyl or sulphonic groups.
- suitable dyes for use in three-colour work are Kiton Red 613 (Schultz No. 110), Acid Fuchsin (Schultz No. 800), Lissamine Red 6B (Schultz No. 110), Kiton Yellow S (Schultz No. 732), Tartrazine (Schultz No. 737) and Alizarin Sapphire Blue CB (Schultz No. 1187).
- Kiton Red 613 Schotz No. 110
- Acid Fuchsin Schotz No. 800
- Lissamine Red 6B Schotz No. 110
- the bleached silver image is produced by treating a silver image which has been developed with a black and white developer with a bath containing hydrochloric acid and an oxidising agent, preferably potassium permanganate and then converting the thus formed silver chloride to silver bromide in a second bath which preferably contains sodium bisulphite or potassium metabisulphite and an alkali metal bromide, preferably potassium bromide.
- a bath containing hydrochloric acid and an oxidising agent preferably potassium permanganate
- a second bath which preferably contains sodium bisulphite or potassium metabisulphite and an alkali metal bromide, preferably potassium bromide.
- the full procedure for the production of a colour record may be as follows. An image is printed and developed in the conventional manner in a black and white developer. It is then bleached in the first bleach bath for 3-5 minutes, washed thoroughly and then treated inthe second bath for 5 minutes, and again washed thoroughly. Until ready for complex formation the sheet is maintained in a solution of 5 ccs of 0.1% acetic acid made up to 1 litre. To form a blue image complex the bleached sheet is immersed in the following bath:
- the treated image-bearing sheet is then washed in changes of still water or in gentle flowing water until the non-image bearing portions are quite clear of any colour.
- the sheet bearing the image complex is then ready for the transfer bath in which it is treated with a solution containing 2.5 gms. of thiourea and 0.5 cc. 99% glacial acetic acid per litre.
- the sheet is left in this bath for about 10 minutes and is then ready for transfer to a mordanted base material, for example, a gelatine-coated paper which has been mordanted with aluminium hydroxide.
- a mordanted base material for example, a gelatine-coated paper which has been mordanted with aluminium hydroxide.
- the sheet and the mordanted paper are brought into face-to-face contact and maintained in contact for 5 to 15 minutes at about F. or until transfer is substantially complete.
- any substance which may conveniently be used in a photographic bath for the maintenance of a pH below 7 may be present in the complex-forming bath when, for example, dyestuffs having carboxylic and/or sulphonic acid groups in the molecule are used, but it is preferred to use materials by means of which a pH between 4 and 6.5 can be readily maintained, such as an alkali metal dihydrogen phosphate or an alkali metal buffer or boric acid.
- a photographic process for producing a positive colour image comprising forming a substantially insoluble silver bromide-amide-acid dyestuff complex by treating silver bromide containing bleached silver image with an aqueous bath containing a substance selected from the group consisting of water-soluble thioamides and selenoamides and with an aqueous bath containing an acid dyestuif and thereafter transferring the dyestuff component of said complex to a permanent base, the improvement in the step of forming said complex which comprises treating said bleached image with an aqueous bath containing (a) a low concentration of said amide (b) an acid dyestuff and (c) a water-soluble bromide salt, whereby said complex is formed in amounts in substantial linear proportionality to the silver present in said bleached image.
- a photographic process for producing a positive colour image comprising forming a substantially insoluble silver bromide-thioamide-acid dyestuif complex by treating a silver bromide containing bleached silver image with an aqueous bath containing a substance selected from the group consisting of water-soluble thioamides and selenoamides and with an aqueous bath containing an acid dyestuif and thereafter transferring the dyestuif component of said complex to a permanent base, the improvement in the step of forming said complex which comprises treating said bleached silver image with an aqueous bath containing (a) a low concentration of said amide (b) an acid dyestuff and (c) a water-soluble bromide salt whereby said complex is formed in amounts in substantial linear proportionality to the silver present in said bleached image.
- a photographic process for producing a positive colour image comprising forming a substantially insoluble silver bromide-thioamide-acid dyestuff complex by treating a silver bromide containing bleached silver image with an aqueous bath containing a substance selected from the group consisting of water-soluble thioamides and selenoamides and with an aqueous bath containing an acid dyestuff and thereafter transferring the dyestuff component of said complex to a permanent base
- the improvement in the step of forming said complex which comprises treating said bleached silver image with an aqueous bath having a pH less than 7 and containing 6 (a) a low concentration of said amide (b) an acid dyestuff and (c) a water-soluble bromide salt whereby said complex is formed in amounts in substantial linear proportionality to the silver present in said bleached image.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB20591/51A GB718716A (en) | 1951-08-31 | 1951-08-31 | Improvements in or relating to colour photography |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2770542A true US2770542A (en) | 1956-11-13 |
Family
ID=10148452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US307567A Expired - Lifetime US2770542A (en) | 1951-08-31 | 1952-09-02 | Colour photography |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2770542A (en(2012)) |
| BE (1) | BE513831A (en(2012)) |
| CH (1) | CH312232A (en(2012)) |
| FR (1) | FR1074576A (en(2012)) |
| GB (1) | GB718716A (en(2012)) |
| NL (2) | NL172160B (en(2012)) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2107094A (en) * | 1934-12-13 | 1938-02-01 | Tru Colour Film Ltd | Colored photography |
-
0
- NL NL87863D patent/NL87863C/xx active
- NL NLAANVRAGE7112246,A patent/NL172160B/xx unknown
- BE BE513831D patent/BE513831A/xx unknown
-
1951
- 1951-08-31 GB GB20591/51A patent/GB718716A/en not_active Expired
-
1952
- 1952-08-30 FR FR1074576D patent/FR1074576A/fr not_active Expired
- 1952-08-30 CH CH312232D patent/CH312232A/de unknown
- 1952-09-02 US US307567A patent/US2770542A/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2107094A (en) * | 1934-12-13 | 1938-02-01 | Tru Colour Film Ltd | Colored photography |
Also Published As
| Publication number | Publication date |
|---|---|
| CH312232A (de) | 1955-12-31 |
| NL172160B (nl) | |
| NL87863C (en(2012)) | |
| FR1074576A (fr) | 1954-10-06 |
| GB718716A (en) | 1954-11-17 |
| BE513831A (en(2012)) |
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