US2525502A - Production of phenazonium dyestuff images - Google Patents
Production of phenazonium dyestuff images Download PDFInfo
- Publication number
- US2525502A US2525502A US793534A US79353447A US2525502A US 2525502 A US2525502 A US 2525502A US 793534 A US793534 A US 793534A US 79353447 A US79353447 A US 79353447A US 2525502 A US2525502 A US 2525502A
- Authority
- US
- United States
- Prior art keywords
- color
- phenazonium
- benzoquinoline
- hydroxy
- images
- 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
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
- G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
- G03C7/32—Colour coupling substances
- G03C7/3244—Couplers forming azinic dyes; Specific developers therefor
Definitions
- the present invention relates to the production of blue-green or cyan phenazonium dyestuff images by color development of an exposed silver halide emulsion with an ortho-phenylenediamine type developer in the presence of a 7.8- benzoquinoline as the color former.
- cyan ,orbluegreen phenazonium dyestufi images are obtained by color developing an exposed silver halide emulsion with an ortho-phenylenediamine type developer in the presence of a benzoquinoline containing in the hetero ring thereof an auxolchromic group such as hydroxyl, amino, ,or substituted amino.
- R is an auxochromic group, such as 2-metl1yl-4.5-dihydroxy-7.8-benzoquinollne H OWN Q H 2.4-dihydroxy-4-methy1-7.8-benzoquino1iue HiC V 2-methy1-4,4' -dihydroxy-5.6-benzoquino1ine 2-methy1-4,5'-dihydroxy-S.G-benzoquinoline i NO-AsOaH:
- Compounds 6, 7, 8, 11 and 12 can be prepared by reacting compound 2 with a mixture of ethyl bromide and sodium hydroxide, treating the compound obtained with phosphorus oxychloride, followed by reaction with a mixture of hydrobromic and acetic acids to obtain -2-'methy1-4-ch1oro-4 hydro'xy-V.8 benzoquino1ine. Upon heating of the latter compound in the presence of a trace of hydrochloric acid with p-amin'ophenylarsonic a in r sp ct v y, the desired compounds are obtained.
- Compounds 9 and 10 can be obtained by reacting Z-methyll-chloro-'-hydroxy-7.8- benzoquinoline with p-phenylenediamine and monotetradecyl-p-phenylene diamine and then reacting the resultant compounds with a mixture of chloroacetyl chloride and acetic acid and finally heating with an aqueous solution of sodium sulfite.
- the color formers are employed either in the emulsion or in the developer. However, where they contain a group preventing diffusion, they are preferably used in the emulsion. Examples of compounds falling'within such category are compounds 8 and 11 above.
- the color developers which are employed are, as stated, of the ortho-phenylenediamine type, a number of examples of which are referred to in the aforesaid Schmidt and Tulagin application. Suitable developers of this class are:
- the invention may be efiectuated so as to use the color developing method for producing 001- ored negatives, colored positives, or reversed images.
- These general methods are conventional in the art, being dependent for their efficacy upon the point at which color development takes place.
- Example 1 To 1 kilo of a silver bromide iodide emulsion is added .7 gram of Z-methyll-(4-N-tetradecylsulfoacetamido-aniline)-4'hydroxy-7.8 benzoquinoline, and the mixture is coated on a suitable support. The resulting film is exposed and developed in a black and white developer. The film is thoroughly washed and the residual silver halide re-exposed and developed in a developer of the following composition:
- Example 2 A silver bromide emulsion is exposed and color developed in a developer of the following constitution:
- Color of Formed Coupler Dye 2-methyl-4.4-dihydroxy7.8-benzoquinoline 2. i-dihydroxy-4-methyl-7.S-benzoquinoline, 2-methyl-4(4"-arsonoanilino)-4-hydroxy 7.8-benzoquinoline. 2-methy1-4 (4-si 1lloanilino) 4-hydroxy-7.8-benzoquinollne. 2-methyl-4 (4@eulfcacetamidoaniline) -4-hydroxy- 7.8-benzoquinoline. 7
- R is an auxochromic group selected from the class consisting of hydroxy and amino groups
- R1 is lower alkyl
- the OH indicated in the formula is in the B-position of the designated benzo ring
- R and R1 are both in the heterocyclic ring.
- R is an auXochromic group selected from the class consisting of hydroxy and. amino groups
- R1 is lower alkyl
- the OH indicated in the formula is in the [3-position of the designated benzo ring
- R and R1 are both in the heterocyclic ring, said compound being free from groups rendering said compound non-diffusing in photographic emulsions.
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)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Heat Sensitive Colour Forming Recording (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Quinoline Compounds (AREA)
Description
Patented Oct. 10, 1,950
UNITED STATES PATENT OFFICE PRODUCTION OF PHENAZONIUM DYESTUFF IMAGES N Drawing.
7 Claims.
The present invention relates to the production of blue-green or cyan phenazonium dyestuff images by color development of an exposed silver halide emulsion with an ortho-phenylenediamine type developer in the presence of a 7.8- benzoquinoline as the color former.
Schmidt and Tulagin copending application Serial Number $10,382, filed January 10, 1946, now Patent No. 2,486,440, describes the production of phenazonium dyestuff images by color developing an exposed silver halide-emulsion with a color developer comprising an ortho-phenylenediamine type developer the presence of various color formers. Among the color formers mentioned are those'cont'aining a phenolic hydroxyl group which couples in para position to such group. It has been observed that with the color formers mentioned in said copending application, the most common color of the dyestuff images obtained is either red or that shade of red known in the photographic art as magenta. As a matter of fact, it may be said that these are the only shades which are obtainable from phenols or naphthols when the coupling reaction takes place para to the phenolic hydroxyl group. This limitation on the shades -of the dyestuffs produced according to the method of said application imposes a restriction on its'use in threecolor photography. v
It has now been discovered that cyan ,orbluegreen phenazonium dyestufi images are obtained by color developing an exposed silver halide emulsion with an ortho-phenylenediamine type developer in the presence of a benzoquinoline containing in the hetero ring thereof an auxolchromic group such as hydroxyl, amino, ,or substituted amino. I
The production of .phenazonium ,dyestuff images by the utilization of such color formers and silver halide-emulsions and color developers containing such color formersconstitute the purposes and objects-of the present invention.
The benzoquinolines contemplated for .employment herein may be represented by the following structural formula? 7 Application December 23, 1947, Serial No. 793,534
5,6'-benzoquinolines or benzo[i]quinolines 7,8-benzoquinolines or benzo[h]quinolines wherein R is an auxochromic group, such as 2-metl1yl-4.5-dihydroxy-7.8-benzoquinollne H OWN Q H 2.4-dihydroxy-4-methy1-7.8-benzoquino1iue HiC V 2-methy1-4,4' -dihydroxy-5.6-benzoquino1ine 2-methy1-4,5'-dihydroxy-S.G-benzoquinoline i NO-AsOaH:
2-methyl-4(4"-arsonoani1ino)-4'-hydroxy-7.8- Y
benzoquinoline 2-methy1-4-amino4'-hydroxy-7.8-benzoquinoline 2-methy1-4 (4 '-su1f ani1ino -4'-hydroxy-7.d-henz qui oliue Nix-OM10 0 ems 03H 0 H3 N Q H 2-methyl-4 (4' -sulfoacetamidoani1ine) -4-hydroxy-7.8- benzoquinoline N-ooomsosn 2-methy1-4 (4"-N-tetradecyl-sulfoacetamidoaniline) 4'- hydroxy-7.8-benzoquino1ine Hac- 12. 1TIH- CnHas 2-methyl-4-1aury1amino-4 hydroxy-7.S-benzoquinoline The benzoquinolines employed as color formers in this invention can be prepared by the following general methods: Thus, compounds '1, 2, 4 and 5 can be prepared by reacting the appropriate aminonaphthol with ethyl acetoacetate in the presence of a trace of hydrochloric acid and then heating the intermediate reactionproduct in mineral o'i1,.to produce the benzoquinoline. Compound 3 is obtainedcby' reacting l-amino-7a naphthol with diketene and then heating at C. the reaction product in sulfuric acid. Compounds 6, 7, 8, 11 and 12 can be prepared by reacting compound 2 with a mixture of ethyl bromide and sodium hydroxide, treating the compound obtained with phosphorus oxychloride, followed by reaction with a mixture of hydrobromic and acetic acids to obtain -2-'methy1-4-ch1oro-4 hydro'xy-V.8 benzoquino1ine. Upon heating of the latter compound in the presence of a trace of hydrochloric acid with p-amin'ophenylarsonic a in r sp ct v y, the desired compounds are obtained. Compounds 9 and 10 can be obtained by reacting Z-methyll-chloro-'-hydroxy-7.8- benzoquinoline with p-phenylenediamine and monotetradecyl-p-phenylene diamine and then reacting the resultant compounds with a mixture of chloroacetyl chloride and acetic acid and finally heating with an aqueous solution of sodium sulfite.
The color formers are employed either in the emulsion or in the developer. However, where they contain a group preventing diffusion, they are preferably used in the emulsion. Examples of compounds falling'within such category are compounds 8 and 11 above.
The color developers which are employed are, as stated, of the ortho-phenylenediamine type, a number of examples of which are referred to in the aforesaid Schmidt and Tulagin application. Suitable developers of this class are:
4;.6:-dianilino ,metanilic acid 4.6 bis (p methoxy phenylamino) -metanilic acid 4 (o methoxy' phenylamino) 6 -(p-methoxyphenylamino) -metani1ic acid 4.6-bis-(o-methoxy phenylamino-metanilic acid 4 (p-sulfo-phenylamino)-6-dimethylamino metanilic acid, and the like.
The invention may be efiectuated so as to use the color developing method for producing 001- ored negatives, colored positives, or reversed images. These general methods are conventional in the art, being dependent for their efficacy upon the point at which color development takes place.
The invention is further illustrated by the following examples, but it is to be understood that the invention is not restricted thereto.
Example 1 To 1 kilo of a silver bromide iodide emulsion is added .7 gram of Z-methyll-(4-N-tetradecylsulfoacetamido-aniline)-4'hydroxy-7.8 benzoquinoline, and the mixture is coated on a suitable support. The resulting film is exposed and developed in a black and white developer. The film is thoroughly washed and the residual silver halide re-exposed and developed in a developer of the following composition:
4.6-dianilino metanilic acid grams 1.5 Sodium sulfite do 60 Potassium carbonate do 40 Pyridine cubic centimeters 12 Water do 1000 The film is washed, bleached and fixed in the conventional manner to yield cyan phenazonium dyestufi images of high contrast.
Example 2 A silver bromide emulsion is exposed and color developed in a developer of the following constitution:
4.6-dianilino metanilic acid "grams" 1.5 Sodium sulfite do Potassium carbonate do 40 Pyridine cubic centimeters 12 2-methy1l.5-dihydroxy-7.8-benzoquinoline grams 1 Water cubic centimeters 1000 The film is washed, bleached and fixed in the customary manner. A negative cyan phenazonium dyestuif image remains.
The following table illustrates the color of the dyestuff images obtained when using other color formers with the developer of Example 1:
Table. l
. Color of Formed Coupler Dye 2-methyl-4.4-dihydroxy7.8-benzoquinoline 2. i-dihydroxy-4-methyl-7.S-benzoquinoline, 2-methyl-4(4"-arsonoanilino)-4-hydroxy 7.8-benzoquinoline. 2-methy1-4 (4-si 1lloanilino) 4-hydroxy-7.8-benzoquinollne. 2-methyl-4 (4@eulfcacetamidoaniline) -4-hydroxy- 7.8-benzoquinoline. 7
Greenish blue.
wherein R is an auxochromic group selected from the class consisting of hydroxy and amino groups, R1 is lower alkyl, the OH indicated in the formula is in the B-position of the designated benzo ring and R and R1 are both in the heterocyclic ring.
2. The process as defined in claim 1, wherein the color former is 2-methy1-4,5-dihydroxy-7.8- benzoquinoline.
3. The process as defined in claim 1, wherein the color former is 2-methyl-4-(4"-tetradecylsulfoacetamidoaniline) -4'-hydroxy 7.8 benzoquinoline.
4. A photographic silver halide emulsion containing as a color former capable of yielding cyan phenazonium dyestuff images when color developed with an ortho-phenylenediamine type developer a compound selected from the group and and
where R is an auXochromic group selected from the class consisting of hydroxy and. amino groups, R1 is lower alkyl, the OH indicated in the formula is in the [3-position of the designated benzo ring and R and R1 are both in the heterocyclic ring, said compound being free from groups rendering said compound non-diffusing in photographic emulsions.
6. The photographic developer of claim 5 wherein the color former is 2-methyl-4.5'-dihydroxy-7 .8-benzoquinoline.
'7. The photographic silver halide emulsion defined in claim 4 wherein the color former is 2- methyl-4-(4"-N tetradecyl-sulfoacetamidoaniline) -4-hydroxy-7.8-benzoquinoline.
VSEVOLOD TULAGIN. WILLY. A. SCHMIDT.
Name Date Frohlich et a1 Mar. 9, 1943 Number
Claims (1)
1. THE PROCESS OF PRODUCING CYAN PHENAZONIUM DYSTUFF IMAGES BY COLOR FORMING DEVELOPMENT WHICH COMPRISES EXPOSING A SILVER HALIDE EMULSION AND DEVELOPING THE SAME WITH AN ORTHOPHENYLENEDIAMINE TYPE DEVELOPER IN THE PRESENCE OF COLOR FORMER SELECTEDC FROM THE GROUP HAVING THE FOLLOWING FORMULAS:
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US640382A US2486440A (en) | 1946-01-10 | 1946-01-10 | Production of phenazonium dyestuff images |
Publications (1)
Publication Number | Publication Date |
---|---|
US2525502A true US2525502A (en) | 1950-10-10 |
Family
ID=41210569
Family Applications (6)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US640382A Expired - Lifetime US2486440A (en) | 1946-01-10 | 1946-01-10 | Production of phenazonium dyestuff images |
US793534A Expired - Lifetime US2525502A (en) | 1946-01-10 | 1947-12-23 | Production of phenazonium dyestuff images |
US793536A Expired - Lifetime US2524725A (en) | 1946-01-10 | 1947-12-23 | Magenta phenazonium dyestuff images from 8-hydroxyquinoline couplers |
US793535A Expired - Lifetime US2525503A (en) | 1946-01-10 | 1947-12-23 | Production of phenazonium dyestuff images |
US793533A Expired - Lifetime US2524741A (en) | 1946-01-10 | 1947-12-23 | Magenta phenazonium dyestuff images from 6-substituted-8-hydroxyquinoline couplers |
US101913A Expired - Lifetime US2570116A (en) | 1946-01-10 | 1949-06-28 | Color developers for the production of azine dye images |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US640382A Expired - Lifetime US2486440A (en) | 1946-01-10 | 1946-01-10 | Production of phenazonium dyestuff images |
Family Applications After (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US793536A Expired - Lifetime US2524725A (en) | 1946-01-10 | 1947-12-23 | Magenta phenazonium dyestuff images from 8-hydroxyquinoline couplers |
US793535A Expired - Lifetime US2525503A (en) | 1946-01-10 | 1947-12-23 | Production of phenazonium dyestuff images |
US793533A Expired - Lifetime US2524741A (en) | 1946-01-10 | 1947-12-23 | Magenta phenazonium dyestuff images from 6-substituted-8-hydroxyquinoline couplers |
US101913A Expired - Lifetime US2570116A (en) | 1946-01-10 | 1949-06-28 | Color developers for the production of azine dye images |
Country Status (6)
Country | Link |
---|---|
US (6) | US2486440A (en) |
BE (6) | BE470459A (en) |
CH (5) | CH280516A (en) |
DE (6) | DE851163C (en) |
FR (6) | FR939497A (en) |
GB (5) | GB644863A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2717831A (en) * | 1953-02-24 | 1955-09-13 | Gen Aniline & Film Corp | Benzo(h)quinolin-ols as azine cyan color formers |
US4511569A (en) * | 1982-08-26 | 1985-04-16 | Schering Corporation | Tricyclic lactams and derivatives useful in increasing cardiac contractility |
US4612316A (en) * | 1983-04-27 | 1986-09-16 | Astra Lakemedel Aktiebolag | Tricyclic amines with central dopaminergic activity |
US4990436A (en) * | 1990-01-23 | 1991-02-05 | Eastman Kodak Company | Cyan dye-forming couplers and photographic recording materials containing same |
US5260177A (en) * | 1988-03-16 | 1993-11-09 | Fuji Photo Film Co., Ltd. | Silver halide color photographic light-sensitive material |
Families Citing this family (23)
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US2611785A (en) * | 1952-09-23 | N-substituted x | ||
CH277023A (en) * | 1949-05-03 | 1951-08-15 | Ciba Geigy | Process for the production of an intermediate product. |
US2575027A (en) * | 1949-10-29 | 1951-11-13 | Gen Aniline & Film Corp | N-substituted 4, 6-diamino metanilic acids |
US2596926A (en) * | 1949-12-16 | 1952-05-13 | Gen Aniline & Film Corp | Preparation of azine dye images |
US2594917A (en) * | 1949-12-16 | 1952-04-29 | Gen Aniline & Film Corp | Suppression of proximity development with azine color developers |
US2623823A (en) * | 1950-03-21 | 1952-12-30 | Gen Aniline & Film Corp | Energizers for aromatic triamino developing agents and suppression of proximity development in azine color developers |
US2618559A (en) * | 1950-03-21 | 1952-11-18 | Gen Aniline & Film Corp | Stain preventing shortstop bath for photographic azine dye images |
US2687431A (en) * | 1950-12-20 | 1954-08-24 | Gen Aniline & Film Corp | Process of preparing nitro phenylenediamines |
BE508676A (en) * | 1951-01-26 | |||
US2691588A (en) * | 1952-03-14 | 1954-10-12 | Eastman Kodak Co | Photographic developers containing 8-hydroxyquinolines |
US2701766A (en) * | 1952-06-14 | 1955-02-08 | Gen Aniline & Film Corp | Developers for and method of producing phenazonium dyestuff images with p-dialkylaminoaniline developing agents |
GB802553A (en) * | 1955-11-18 | 1958-10-08 | Gen Aniline & Film Corp | Improvements in or relating to colour photographic materials and processes |
US2945761A (en) * | 1957-07-29 | 1960-07-19 | Eastman Kodak Co | Reactivity of couplers incorporated in photographic emulsions |
DE1069470B (en) * | 1958-04-03 | 1959-11-19 | General Aniline &. Film Corporation, New York, N. Y. (V.St.A.) | Photographic silver halide emulsion or developer with a color former which, after color development with a developer of the p-phenylenediamine rub, gives a yellow azine color image |
US3099559A (en) * | 1959-08-31 | 1963-07-30 | Gen Aniline & Film Corp | Silver-free color reproduction process and composition therefor |
BE594935A (en) * | 1959-09-11 | |||
US3050394A (en) * | 1959-09-30 | 1962-08-21 | Gen Aniline & Film Corp | Method of incorporating color couplers in hydrophlic colloids |
US3077403A (en) * | 1960-05-31 | 1963-02-12 | Gen Aniline & Film Corp | Color former containing bis coupling functions |
JPS59177554A (en) * | 1983-03-28 | 1984-10-08 | Fuji Photo Film Co Ltd | Silver halide color photosensitive material |
US4680299A (en) * | 1984-04-30 | 1987-07-14 | E.I. Du Pont De Nemours And Company | 2-phenyl-4-quinolinecarboxylic acids and pharmaceutical compositions thereof |
US4847381A (en) * | 1987-08-31 | 1989-07-11 | American Cyanamid Company | 2-Phenyl-4-quinoline carboxylic acids |
US5223386A (en) * | 1989-03-04 | 1993-06-29 | Konica Corporation | Cyan coupler |
EP0386931A1 (en) * | 1989-03-04 | 1990-09-12 | Konica Corporation | A novel cyan coupler |
Citations (1)
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US2313138A (en) * | 1940-07-31 | 1943-03-09 | Gen Aniline & Film Corp | Production of color photographic images |
Family Cites Families (22)
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GB178986A (en) * | 1921-02-11 | 1922-05-04 | John Augustus Ward | Improvements in and relating to advertising apparatus |
US1782356A (en) * | 1927-11-14 | 1930-11-18 | Firm J R Geigy S A | Manufacture of acid dyestuffs of the phenonaphthosafranine series |
US1886809A (en) * | 1929-09-04 | 1932-11-08 | Gen Aniline Works Inc | Arylated safranines and process of preparing them |
BE369421A (en) * | 1929-09-09 | |||
GB458664A (en) * | 1935-03-21 | 1936-12-21 | Eastman Kodak Co | Improvements in and relating to colour forming developers and processes of colour development |
DE767652C (en) * | 1936-05-27 | 1953-03-02 | Ig Farbenindustrie Ag | Process for the color development of halogen silver emulsions |
US2306410A (en) * | 1936-07-07 | 1942-12-29 | Eastman Kodak Co | Color development |
US2356475A (en) * | 1936-07-07 | 1944-08-22 | Eastman Kodak Co | Phenolic and naphtholic couplers containing sulphonamide groups |
US2196739A (en) * | 1938-09-23 | 1940-04-09 | Eastman Kodak Co | Photographic developer for color photography |
GB531312A (en) * | 1939-03-31 | 1941-01-01 | Eastman Kodak Co | Improvements in and relating to colour forming developers and processes of colour development |
US2193015A (en) * | 1939-05-24 | 1940-03-12 | Eastman Kodak Co | Developer containing sulphonamide groups |
GB536939A (en) * | 1939-08-24 | 1941-06-03 | Eastman Kodak Co | Improvements in and relating to photographic colour development |
FR956696A (en) * | 1941-08-08 | 1950-02-02 | ||
FR956698A (en) * | 1941-09-11 | 1950-02-02 | ||
GB553064A (en) * | 1941-09-25 | 1943-05-06 | Eastman Kodak Co | Improvements in photographic developers |
US2364350A (en) * | 1941-11-06 | 1944-12-05 | Eastman Kodak Co | Photographic developer |
US2400872A (en) * | 1942-09-01 | 1946-05-28 | Eastman Kodak Co | Diamino-nu-alkyl phenazinium salts |
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GB576891A (en) * | 1944-05-12 | 1946-04-25 | John David Kendall | Improvements in or relating to colour photography |
BE465025A (en) * | 1945-01-27 | |||
US2489440A (en) * | 1945-05-03 | 1949-11-29 | Naylor Brothers Ltd | Conveyer |
US2445252A (en) * | 1947-04-10 | 1948-07-13 | Gen Aniline & Film Corp | Photographic elements containing urethanes of nu-substituted j acids as color formers |
-
1946
- 1946-01-10 US US640382A patent/US2486440A/en not_active Expired - Lifetime
- 1946-12-11 GB GB36617/46A patent/GB644863A/en not_active Expired
-
1947
- 1947-01-03 FR FR939497D patent/FR939497A/en not_active Expired
- 1947-01-10 BE BE470459D patent/BE470459A/xx unknown
- 1947-12-23 US US793534A patent/US2525502A/en not_active Expired - Lifetime
- 1947-12-23 US US793536A patent/US2524725A/en not_active Expired - Lifetime
- 1947-12-23 US US793535A patent/US2525503A/en not_active Expired - Lifetime
- 1947-12-23 US US793533A patent/US2524741A/en not_active Expired - Lifetime
-
1948
- 1948-12-10 FR FR61007D patent/FR61007E/en not_active Expired
- 1948-12-10 FR FR61004D patent/FR61004E/en not_active Expired
- 1948-12-10 FR FR61005D patent/FR61005E/en not_active Expired
- 1948-12-10 FR FR58855D patent/FR58855E/en not_active Expired
- 1948-12-10 FR FR61006D patent/FR61006E/en not_active Expired
- 1948-12-14 GB GB32322/48A patent/GB646490A/en not_active Expired
- 1948-12-14 DE DEP24686D patent/DE851163C/en not_active Expired
- 1948-12-14 DE DEP24682A patent/DE837959C/en not_active Expired
- 1948-12-14 GB GB32321/48A patent/GB647638A/en not_active Expired
- 1948-12-14 DE DEP24684D patent/DE854889C/en not_active Expired
- 1948-12-14 GB GB32257/48A patent/GB646348A/en not_active Expired
- 1948-12-14 GB GB32258/48A patent/GB649811A/en not_active Expired
- 1948-12-14 DE DEP24685D patent/DE817554C/en not_active Expired
- 1948-12-14 DE DEP24683A patent/DE850385C/en not_active Expired
- 1948-12-20 CH CH280516D patent/CH280516A/en unknown
- 1948-12-21 BE BE486430D patent/BE486430A/xx unknown
- 1948-12-21 BE BE486433D patent/BE486433A/xx unknown
- 1948-12-21 BE BE486434D patent/BE486434A/xx unknown
- 1948-12-22 CH CH280517D patent/CH280517A/en unknown
- 1948-12-22 CH CH283787D patent/CH283787A/en unknown
- 1948-12-22 CH CH280518D patent/CH280518A/en unknown
- 1948-12-22 CH CH283788D patent/CH283788A/en unknown
-
1949
- 1949-01-01 DE DEP29268A patent/DE848155C/en not_active Expired
- 1949-01-15 BE BE486432D patent/BE486432A/xx unknown
- 1949-01-15 BE BE486431D patent/BE486431A/xx unknown
- 1949-06-28 US US101913A patent/US2570116A/en not_active Expired - Lifetime
Patent Citations (1)
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US2313138A (en) * | 1940-07-31 | 1943-03-09 | Gen Aniline & Film Corp | Production of color photographic images |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2717831A (en) * | 1953-02-24 | 1955-09-13 | Gen Aniline & Film Corp | Benzo(h)quinolin-ols as azine cyan color formers |
US4511569A (en) * | 1982-08-26 | 1985-04-16 | Schering Corporation | Tricyclic lactams and derivatives useful in increasing cardiac contractility |
US4612316A (en) * | 1983-04-27 | 1986-09-16 | Astra Lakemedel Aktiebolag | Tricyclic amines with central dopaminergic activity |
US5260177A (en) * | 1988-03-16 | 1993-11-09 | Fuji Photo Film Co., Ltd. | Silver halide color photographic light-sensitive material |
US4990436A (en) * | 1990-01-23 | 1991-02-05 | Eastman Kodak Company | Cyan dye-forming couplers and photographic recording materials containing same |
Also Published As
Publication number | Publication date |
---|---|
GB646348A (en) | 1950-11-22 |
GB646490A (en) | 1950-11-22 |
DE854889C (en) | 1952-11-06 |
FR61006E (en) | 1955-03-23 |
DE850385C (en) | 1952-09-25 |
DE848155C (en) | 1952-11-04 |
BE486430A (en) | 1949-01-16 |
US2486440A (en) | 1949-11-01 |
FR61007E (en) | 1955-03-23 |
DE837959C (en) | 1952-05-05 |
US2570116A (en) | 1951-10-02 |
CH283787A (en) | 1952-06-30 |
BE486431A (en) | 1948-12-21 |
FR61004E (en) | 1955-03-23 |
FR58855E (en) | 1954-04-06 |
FR939497A (en) | 1948-11-16 |
DE817554C (en) | 1951-10-18 |
BE486434A (en) | 1949-01-15 |
CH280518A (en) | 1952-01-31 |
BE486433A (en) | 1949-01-15 |
US2524741A (en) | 1950-10-03 |
DE851163C (en) | 1952-10-02 |
FR61005E (en) | 1955-03-23 |
CH280517A (en) | 1952-01-31 |
GB649811A (en) | 1951-01-31 |
GB647638A (en) | 1950-12-20 |
GB644863A (en) | 1950-10-18 |
CH283788A (en) | 1952-06-30 |
BE470459A (en) | 1947-02-28 |
US2525503A (en) | 1950-10-10 |
BE486432A (en) | 1949-01-15 |
CH280516A (en) | 1952-01-31 |
US2524725A (en) | 1950-10-03 |
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