US1966332A - Method of making photographic images in dyed silver iodide - Google Patents
Method of making photographic images in dyed silver iodide Download PDFInfo
- Publication number
- US1966332A US1966332A US615032A US61503232A US1966332A US 1966332 A US1966332 A US 1966332A US 615032 A US615032 A US 615032A US 61503232 A US61503232 A US 61503232A US 1966332 A US1966332 A US 1966332A
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- image
- silver
- silver iodide
- iodide
- layer
- Prior art date
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- 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 title description 39
- 229910021612 Silver iodide Inorganic materials 0.000 title description 39
- 229940045105 silver iodide Drugs 0.000 title description 39
- 238000004519 manufacturing process Methods 0.000 title description 3
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 30
- 239000000839 emulsion Substances 0.000 description 26
- 238000000034 method Methods 0.000 description 18
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 17
- 229910052709 silver Inorganic materials 0.000 description 17
- 239000004332 silver Substances 0.000 description 17
- 239000000975 dye Substances 0.000 description 15
- 239000000126 substance Substances 0.000 description 11
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000000981 basic dye Substances 0.000 description 6
- 230000001235 sensitizing effect Effects 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 3
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 3
- 108010010803 Gelatin Proteins 0.000 description 3
- 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 3
- 229920000159 gelatin Polymers 0.000 description 3
- 239000008273 gelatin Substances 0.000 description 3
- 235000019322 gelatine Nutrition 0.000 description 3
- 235000011852 gelatine desserts Nutrition 0.000 description 3
- 229910052740 iodine Inorganic materials 0.000 description 3
- 239000011630 iodine Substances 0.000 description 3
- 238000009896 oxidative bleaching Methods 0.000 description 3
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000003287 bathing Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- FDZZZRQASAIRJF-UHFFFAOYSA-M malachite green Chemical compound [Cl-].C1=CC(N(C)C)=CC=C1C(C=1C=CC=CC=1)=C1C=CC(=[N+](C)C)C=C1 FDZZZRQASAIRJF-UHFFFAOYSA-M 0.000 description 2
- 229940107698 malachite green Drugs 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- INCIMLINXXICKS-UHFFFAOYSA-M pyronin Y Chemical compound [Cl-].C1=CC(=[N+](C)C)C=C2OC3=CC(N(C)C)=CC=C3C=C21 INCIMLINXXICKS-UHFFFAOYSA-M 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- DKNPRRRKHAEUMW-UHFFFAOYSA-N Iodine aqueous Chemical compound [K+].I[I-]I DKNPRRRKHAEUMW-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 241000212342 Sium Species 0.000 description 1
- 239000004133 Sodium thiosulphate Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
- 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 1
- 238000003756 stirring Methods 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- G03C1/00—Photosensitive materials
- G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
- G03C1/485—Direct positive emulsions
- G03C1/48515—Direct positive emulsions prefogged
Definitions
- This invention relates to a method of making ordinary sodium thiosulphate solution, or it may photographic images in silver iodide and parbe removed with an oxidizing bleaching solution, ticularly to a method of making color images. leaving only the negative silver iodide image.
- a silver iodide emulsion is bathed in a chemi-
- cal sensitizer such as a dilute solution of sodium lies in the fact that basic dyes may be readily sulphite or sodium hydroxide, dried, and uniincorporated in, or mordanted to, the silver iodide formly exposed to a strong light.
- iodide 105 is now exposed to a light image and developedin emulsions dyed with different colors and to mix a powerful photographic developer.
- emulsions may then be used for a direct color
- the positive silver image may be fixed by an processinwhich the grains of the different colors 110 are simultaneously exposed and treated by various chemical reagents.
- Solution I Gelatin 121/2% solution 30 cc. Silver nitrate, 100 grams per liter 15 cc. Basic dye, 1% solution 10 cc.
- Solution II is poured into Solution I with vigorous stirring and is made into an emulsion by methods which are well known and which include setting, shredding, washing, remelting and coating.
- a chemical sensitizer such as for example a 1/% solution of sodium sulphite or a 116% solution of sodium hydroxide.
- the plates are then dried and uniformly exposed to a strong light. After exposure, the plates are thoroughly washed to remove the chemical sensitizer and are then treated preferably with a 1% solution of potassium iodide.
- the plates are again dried. They are next exposed to the desired subject. They are then developed in a powerful photographic developer, such as what is well known in the art as a caustic hydroquinone process developer. Finally, they are bleached in an oxidizing solution of which the following is a satisfactory formula:
- the dye color-sensitizes the silver iodide, both for the first or fogging exposure and for the second or image-forming exposure.
- Malachite green makes the silver iodide red sensitive
- Pyronine G makes it green sensitive.
- Our invention may be used advantageously to obtain monochrome dye images, since it requires less image-forming exposure than the process in which a negative silver image is developed from silver iodide and a positive dye image is subsequently obtained.
- Our invention would likewise be useful in a. socalled mixed grain process, it being possible to mix intimately three separate portions of silver iodide emulsions, each dyed a different color, and then to process such a mixed emulsion bythe methods we have given.
- the method of producing photographic images which comprises chemically sensitizing a silver iodide emulsion layer, uniformly exposing.
- said layer to strong light, removing any excess chemical sensitizer, treating the layer with a solution of potassium iodide, exposing the layer to alight image, and developing.
- the method of producing photographic images which comprises chemically sensitizing a silver iodide emulsion layer, uniformly exposing said layer to a strong light, washing the layer to remove the chemical sensitizer, treating the layer with a solution of potassium iodide, exposing the layer to a light image, and developing in a powerful photographic developer.
- the method of producing photographic images which comprises precipitating an emulsion containing silver iodide and dye absorbed to the silver iodide, forming a layer therefrom, uniformly exposing the layer to light, treating the layer with an alkali iodide, exposing it to a. light image, developing a silver image in the layer and removing the silver image and the dye associated therewith, thus leaving a dyed silver iodide image.
- 'I'he method of producing a photographic color image which comprises chemically sensitizing a silver iodide emulsion layer, uniformly exposing said layer to a strong light, washing the layer to remove the chemical sensitizer, treating the layer with a solution of potassium iodide, exposing the layer to a light image, developing in a powerful photographic developer, removing the positive silver image with an oxidizing bleaching solution, and mordanting a dye to the remaining silver iodide image.
- the method of producing a photographic color image which comprises chemically sensitizing a silver iodide emulsion layer, uniformly exposing said layer to a strong light, washing the layer to remove the chemical sensitizer, treating the layer with a solution of potassium iodide, exposing the layer to a light image, developing in a powerful photographic developer, removing the positive silver image with an oxidizing bleaching solution, and mordanting a basic dye to the remaining silver iodide image.
- the method of producing a photographic color image which comprises chemically sensitizing a silver iodide emulsion layer containing a basic dye absorbed to the silver iodide, uniformly exposing said layer to a strong light, washing the layer tov remove the chemical sensitizer, treating the layer with a solution of potassium iodide, exposing the layer to a light image, developing and then removing the devloped image, leaving a dyed silver iodide image.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Description
July 10, 1934 J. G. cAPsTAl-'F ET A1. 1,966,332 METHOD 0F MAKING PHOTOGRAPHIC IMAGES IN DYED SILVER vIDIDE Filed June 2, 1932` Sh 8 SGMSJ@ u r 111/ rl Silver '7 l 5 amedfmgpomsmiqdfde. l
a.A o I SMMMWW W Alemzive l K Bleadz/ out ,silver and Ew pubs'dvarjodlde assoclhe/ Zeazmy ,szlvezwzzzgR 11)' leamgsilver y wr iodidemd/@e/ maya swarm prevzously wzdyed Hot n-c 1.1.
Patented July 10, 1934. l n
METHOD F MAKING PHOTOGRAPHIC IMAGES IN DYED SILVER IODIDE John G. Capstal! and Merrill W. Seymour, Rochester, N. Y., assignors to Eastman Kodak Company, Rochester, N. Y., a corporation of New York Application June2, 1932, Serial No. 615,032
7 Claims. (Cl. 95-6) This invention relates to a method of making ordinary sodium thiosulphate solution, or it may photographic images in silver iodide and parbe removed with an oxidizing bleaching solution, ticularly to a method of making color images. leaving only the negative silver iodide image.
It is well known that positive silver images The silver iodide image may be used to mordant may be made by uniformly exposing a silver various basic dyes andso yield colored images b bromide emulsion to light, converting the silver bathing in the dye solutions. bromide .to silver iodide by means of potassium Alternatively, basic dyes may be incorporated iodide solution, exposing the converted emulsion in the silver iodide emulsion at the time of maklo a, desired subject, and developing in a vigorous ing. This is done preferably by having the dye m photographic developer. It has also been found present at the time of precipitation of the silver that, by treating the silver iodide emulsion with iodide. A 'deeply dyed silver iodide is thus obpotassium bromide together with certain desensitained. The excess of soluble salts is washed tizing dyes, a reversed image may be obtained. from the emulsion in the usual manner. -The A brief explanation will make clearer the basis coated and'dried plates are then treated with of the process just described and that of our inthe chemical sensitizer as above, uniformly exvention. In order to form a developable latent lposed to strong light, washed to remove the image in a silver iodide and gelatin emulsion by chemical sensitizer, treated with a solution of the action of light, the presence of an iodine potassium iodide, dried, exposed to the desired acceptor at the time of exposure is necessary. subject and developedin apowerful photographic 2 Various substances may function in this role, developer.
among them being sodium sulte, sodium hy- The plate is then bleached in an oxidizing soludroxide, and monomethyl-paramido phenol. tion. At this stage it will be found that the If, on the other hand, no acceptor is present dye has been liberated in the places where the at the moment of exposure, but instead potassilver iodidel was reduced to silver and that a sium iodide is in contact with the silver iodide, negative dye image remains adsorbed to silver s not only canno developable negative image be iodide. formed but any latent image whichl may have Our invention makes use of the same principles been present will be bleached or reversed on furas first outlined, but has certain advantages over ther exposure to light. In the method above, the older method. We start with a silver iodide the latent image formed in silver bromide is emulsion and sensitize it or bath it in an iodine 35 not destroyed when the silver bromide is conacceptor. This renders the silver iodide suscepverted to silver iodide. After the conversion, tible to the formation of a latent image upon however, there is excess of potassium iodide presexposure to light. The plate is then uniformly ent and further exposure bleaches the already exposed or fogged. The sensitizer (iodine ac- 5 fogged silver salt and thus yields a positive image. ceptor) is next washed out, and the plate bathed 90 We have found that it is possible to start with in potassium iodide solution. The silver iodide a silver iodide emulsion and obtain either a posiis now in a state such that further exposure .tive silver image or a negative silver iodide image. bleaches the latent image already formed to an Our invention, briefly, is carried out as follows extent dependent upon the amount of such exreference being made to the accompanying drawposure, and thereby forms a positive image on ing, in which there is shown in the form of a flow exposure to a light image. The plate is desheet the relation of the several steps of the veloped in a powerful developer and may thereprocess: y after be treated in one of several ways.
A silver iodide emulsion is bathed in a chemi- One of the chief advantages in our invention cal sensitizer, such as a dilute solution of sodium lies in the fact that basic dyes may be readily sulphite or sodium hydroxide, dried, and uniincorporated in, or mordanted to, the silver iodide formly exposed to a strong light. After this exemulsion at the time of making and this dye reposure, the plate is thoroughly washed to remainsinthe emulsion throughout the subsequent move the chemical sensitizentreated with a soluoperations until the silver image is bleached.
0 tion of potassium iodide and dried. The plate This makes it possible to prepare several iodide 105 is now exposed to a light image and developedin emulsions dyed with different colors and to mix a powerful photographic developer. A positive these dyed emulsions, each kind of grain retainsilver image and a negative silver iodide image ing its specic color sensitivity. Such mixed are present at this point. emulsions may then be used for a direct color The positive silver image may be fixed by an processinwhich the grains of the different colors 110 are simultaneously exposed and treated by various chemical reagents.
It also makes it much more convenient to produce a monochrome image. If one starts with silver bromide, fogs, converts to silver iodide and then produces the reversal image, the plate must be dyed in the later stages by a separate operation. Our invention obviates this.
In a preferred form of our invention, we proceed as follows:
A silver iodide emulsion containing a dye is made. For this we may use, by way of example, the following formula:
Solution I Gelatin, 121/2% solution 30 cc. Silver nitrate, 100 grams per liter 15 cc. Basic dye, 1% solution 10 cc. Solution I I Gelatin, 12 l/2% solution 30 cc. Potassium iodide, 100 grams per liter 17 cc.
Solution II is poured into Solution I with vigorous stirring and is made into an emulsion by methods which are well known and which include setting, shredding, washing, remelting and coating.
A large number of dyes are available for use in making this emulsion, two examples being Malachite green and Pyronine G, these dyes having respectively the British Color Index numbers 657 and 739.
After plates or films coated with this emulsion are dried, they are bathed in a chemical sensitizer, such as for example a 1/% solution of sodium sulphite or a 116% solution of sodium hydroxide. The plates are then dried and uniformly exposed to a strong light. After exposure, the plates are thoroughly washed to remove the chemical sensitizer and are then treated preferably with a 1% solution of potassium iodide. The plates are again dried. They are next exposed to the desired subject. They are then developed in a powerful photographic developer, such as what is well known in the art as a caustic hydroquinone process developer. Finally, they are bleached in an oxidizing solution of which the following is a satisfactory formula:
Sulphuric acid, 100 grams per liter 4 cc. Potassium bichromate, 100 grams per liter 4 cc. Water to 200 cc.
It is found that the dye color-sensitizes the silver iodide, both for the first or fogging exposure and for the second or image-forming exposure. Thus, Malachite green makes the silver iodide red sensitive, while Pyronine G makes it green sensitive.
Our invention may be used advantageously to obtain monochrome dye images, since it requires less image-forming exposure than the process in which a negative silver image is developed from silver iodide and a positive dye image is subsequently obtained.
Our invention would likewise be useful in a. socalled mixed grain process, it being possible to mix intimately three separate portions of silver iodide emulsions, each dyed a different color, and then to process such a mixed emulsion bythe methods we have given.
It is understood that our invention is not limited by the examples given, but we contemplate as included therein all modifications and equivalents which fall within the scope of the appended claims.
What we claim is:
l. The method of producing photographic images which comprises precipitating a silver iodide emulsion, forming a layer therefrom, bathing with an iodine acceptor uniformly exposing the layer to light, treating the layer with an alkali iodide, exposing it to a light image and developing the image.
2. The method of producing photographic images which comprises chemically sensitizing a silver iodide emulsion layer, uniformly exposing.
said layer to strong light, removing any excess chemical sensitizer, treating the layer with a solution of potassium iodide, exposing the layer to alight image, and developing.
3. The method of producing photographic images which comprises chemically sensitizing a silver iodide emulsion layer, uniformly exposing said layer to a strong light, washing the layer to remove the chemical sensitizer, treating the layer with a solution of potassium iodide, exposing the layer to a light image, and developing in a powerful photographic developer.
4. The method of producing photographic images which comprises precipitating an emulsion containing silver iodide and dye absorbed to the silver iodide, forming a layer therefrom, uniformly exposing the layer to light, treating the layer with an alkali iodide, exposing it to a. light image, developing a silver image in the layer and removing the silver image and the dye associated therewith, thus leaving a dyed silver iodide image.
5. 'I'he method of producing a photographic color image which comprises chemically sensitizing a silver iodide emulsion layer, uniformly exposing said layer to a strong light, washing the layer to remove the chemical sensitizer, treating the layer with a solution of potassium iodide, exposing the layer to a light image, developing in a powerful photographic developer, removing the positive silver image with an oxidizing bleaching solution, and mordanting a dye to the remaining silver iodide image.
6. The method of producing a photographic color image which comprises chemically sensitizing a silver iodide emulsion layer, uniformly exposing said layer to a strong light, washing the layer to remove the chemical sensitizer, treating the layer with a solution of potassium iodide, exposing the layer to a light image, developing in a powerful photographic developer, removing the positive silver image with an oxidizing bleaching solution, and mordanting a basic dye to the remaining silver iodide image.
7. The method of producing a photographic color image which comprises chemically sensitizing a silver iodide emulsion layer containing a basic dye absorbed to the silver iodide, uniformly exposing said layer to a strong light, washing the layer tov remove the chemical sensitizer, treating the layer with a solution of potassium iodide, exposing the layer to a light image, developing and then removing the devloped image, leaving a dyed silver iodide image.
JOHN G. CAPSTAFF. MERRILL W. SEYMOUR.
Patent No. 1,966,332.
CERTIFICATE 0F o0RRECT10iJ.` y
July i0, 1934.
JOHN G. CAPSTAFF, ET AL.
It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, lines 105 and 138, claims 4 and 7, respectively. for "absorbed" read adsorbed; and that the said Letters Pater.: should be read with these corrections therein that lthe same may conform to the record ef the case in the Patent Office.
Signed and sealed this 11th day ofA September, A. D. 1934.
Leslie Frazer (Seal) l' I Acting Commissioner of Patents.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US615032A US1966332A (en) | 1932-06-02 | 1932-06-02 | Method of making photographic images in dyed silver iodide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US615032A US1966332A (en) | 1932-06-02 | 1932-06-02 | Method of making photographic images in dyed silver iodide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1966332A true US1966332A (en) | 1934-07-10 |
Family
ID=24463724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US615032A Expired - Lifetime US1966332A (en) | 1932-06-02 | 1932-06-02 | Method of making photographic images in dyed silver iodide |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1966332A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2944897A (en) * | 1956-12-12 | 1960-07-12 | Newman S Shirk | Reversal film method |
-
1932
- 1932-06-02 US US615032A patent/US1966332A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2944897A (en) * | 1956-12-12 | 1960-07-12 | Newman S Shirk | Reversal film method |
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