US2768079A - Method of preparing washed photographic emulsions - Google Patents
Method of preparing washed photographic emulsions Download PDFInfo
- Publication number
- US2768079A US2768079A US406061A US40606154A US2768079A US 2768079 A US2768079 A US 2768079A US 406061 A US406061 A US 406061A US 40606154 A US40606154 A US 40606154A US 2768079 A US2768079 A US 2768079A
- Authority
- US
- United States
- Prior art keywords
- gelatin
- silver halide
- dispersion
- grams
- derivatives
- 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 claims description 17
- 239000000839 emulsion Substances 0.000 title description 27
- -1 SILVER HALIDE Chemical class 0.000 claims description 76
- 229910052709 silver Inorganic materials 0.000 claims description 72
- 239000004332 silver Substances 0.000 claims description 72
- 239000008273 gelatin Substances 0.000 claims description 62
- 229920000159 gelatin Polymers 0.000 claims description 62
- 108010010803 Gelatin Proteins 0.000 claims description 53
- 235000019322 gelatine Nutrition 0.000 claims description 53
- 235000011852 gelatine desserts Nutrition 0.000 claims description 53
- 239000006185 dispersion Substances 0.000 claims description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 150000003839 salts Chemical class 0.000 claims description 25
- 239000008187 granular material Substances 0.000 claims description 16
- 239000007864 aqueous solution Substances 0.000 claims description 15
- 230000001112 coagulating effect Effects 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical class [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical class [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 239000012948 isocyanate Substances 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical class [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical class [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910052793 cadmium Inorganic materials 0.000 claims description 4
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical class [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims description 4
- 150000001244 carboxylic acid anhydrides Chemical class 0.000 claims description 4
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000011651 chromium Chemical class 0.000 claims description 4
- 150000004820 halides Chemical class 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 229910052746 lanthanum Chemical class 0.000 claims description 4
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical class [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 239000011701 zinc Chemical class 0.000 claims description 4
- 150000002513 isocyanates Chemical class 0.000 claims description 2
- YBBRCQOCSYXUOC-UHFFFAOYSA-N sulfuryl dichloride Chemical class ClS(Cl)(=O)=O YBBRCQOCSYXUOC-UHFFFAOYSA-N 0.000 claims 1
- YKYOUMDCQGMQQO-UHFFFAOYSA-L cadmium dichloride Chemical compound Cl[Cd]Cl YKYOUMDCQGMQQO-UHFFFAOYSA-L 0.000 description 26
- 239000000243 solution Substances 0.000 description 17
- 239000012153 distilled water Substances 0.000 description 12
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 12
- 230000015271 coagulation Effects 0.000 description 11
- 238000005345 coagulation Methods 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 6
- 229910001961 silver nitrate Inorganic materials 0.000 description 6
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 4
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical class [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 239000012452 mother liquor Substances 0.000 description 3
- HKWPWGJLSWDDEC-UHFFFAOYSA-N 3-heptyloxolane-2,5-dione Chemical compound CCCCCCCC1CC(=O)OC1=O HKWPWGJLSWDDEC-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical class [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 150000008064 anhydrides Chemical class 0.000 description 2
- CSKNSYBAZOQPLR-UHFFFAOYSA-N benzenesulfonyl chloride Chemical compound ClS(=O)(=O)C1=CC=CC=C1 CSKNSYBAZOQPLR-UHFFFAOYSA-N 0.000 description 2
- 229920002301 cellulose acetate Polymers 0.000 description 2
- 239000000499 gel Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000001103 potassium chloride Substances 0.000 description 2
- 235000011164 potassium chloride Nutrition 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- MUTGBJKUEZFXGO-OLQVQODUSA-N (3as,7ar)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione Chemical class C1CCC[C@@H]2C(=O)OC(=O)[C@@H]21 MUTGBJKUEZFXGO-OLQVQODUSA-N 0.000 description 1
- BDQNKCYCTYYMAA-UHFFFAOYSA-N 1-isocyanatonaphthalene Chemical compound C1=CC=C2C(N=C=O)=CC=CC2=C1 BDQNKCYCTYYMAA-UHFFFAOYSA-N 0.000 description 1
- NGNBDVOYPDDBFK-UHFFFAOYSA-N 2-[2,4-di(pentan-2-yl)phenoxy]acetyl chloride Chemical compound CCCC(C)C1=CC=C(OCC(Cl)=O)C(C(C)CCC)=C1 NGNBDVOYPDDBFK-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000008065 acid anhydrides Chemical class 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- MFZUXRKTKZKWSS-UHFFFAOYSA-N benzene;sulfuryl dichloride Chemical class ClS(Cl)(=O)=O.C1=CC=CC=C1 MFZUXRKTKZKWSS-UHFFFAOYSA-N 0.000 description 1
- 150000001661 cadmium Chemical class 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010908 decantation Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 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
- 239000000126 substance Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000010792 warming Methods 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
- G03C1/00—Photosensitive materials
- G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
- G03C1/015—Apparatus or processes for the preparation of emulsions
Definitions
- One object of my invention is to provide a method for preparing washed silver halide emulsions in which the silver halide may be coagulated without the necessity of altering the pH thereof. Another object of my invention is to provide a method for washing fine grained emulsions in which the tendency to form grain clumps is diminished. Another object of my invention is to provide a method for preparing washed silver halide emulsions in which change of the pH of the mass is not necessary to obtain coagulation of the emulsion. A further object of my invention is to provide a method of purifying a gelatin emulsion in which the salts of certain metals have been found to be quite useful.
- gelatin derivatives which I have found to be useful as peptizers for dispersing silver halide for preparing washed emulsions in accordance with my invention are the aromatic sulfonyl chloride derivatives of gelatin, the
- gelatin the carcarboxylic acid chloride boxylic anhydride derivatives of gelatin, the aromatic isocyanate derivatives of gelatin and the l,4-diketone derivatives of gelatin.
- the preparation of these gelatin derivatives is known in the prior art as disclosed, for example, in U. S. Patent No. 2,614,929 of Yutzy and Russell, October 21, 1952.
- the reaction products of any of the with. gelatin may be employed for that purpose.
- the salts which I have foundto be useful for coagulating dispersions of silver halide in gelatin derivatives are the watersoluble salts of cadmium; zinc, aluminum, iron,
- v the metal salt which gives maximum coagulation will vary depending upon; the particular salt. employed, the temperature of the dispersion and the pH of the emulsion at the time of coagulation. For instance, in thecase of a dispersion-of silver halide in a gelatin derivative having a temperature of 30 C. and a pH of the-amount of cadmiumchloride which will give optimum result's'has been: foundto. be approximately 15.5 grams per mol of silver .halide.
- the liquid portion thereof is removed from the settled portion such as by decantation.
- the silver halide may then be redispersed by adding water to the particle mass, preferably with the use of a slightly elevated temperature and if desired, a washing withwater having a temperature of 10 C. may be employed prior to redispersion. If desired, the dispersion may be recoagulated by again adding salt and decanting off the mother liquor. Upon redispersion it is desirable to 'addthereto a solution of a carrier for the silver halide such as gelatin or far-hydrolyzed cellulose acetate to form a photographic emulsion of the desired silver halide concentration.
- a carrier for the silver halide such as gelatin or far-hydrolyzed cellulose acetate
- Example 1 potassium chloride and 2.6 grams of potassium iodide in 3000 cc. of distilled water at 60 C. This wasaccomplished by-adding thesilver nitrate solution to the second.
- a dispersion of silver halide was preparedby mixinga solution of 400 grams of silver nitrate in 3600 cc. .of distilled water at 30 C. with a solution of 59 grams of benzene sulfonyl chloride gelatin derivative, 142 grams of potassium chloride and 57 grams of potassium bromide dissolved in 3400 cc. of distilled water at 30 C.
- the silver nitrate solution was added to the alkali halide gelatin solution over a period of approximately 2 minutes .with good stirring.
- the dispersion thus formed was heated to 40 C. and the mass was found to have a pH of 5.95.
- a dispersion of silver halide in gelatin derivative was prepared by mixing a solution of 400 grams of 'silver nitrate in 4100 cc. of distilled water at 72 C. with a solution 'of 59 grams of n-heptyl succinic anhydride gela- 1 tin derivative, 330 grams of potassium bromide and 6 grams of potassium iodide in 3400 cc. of distilled water at 70 C.
- the silver nitrate solution was added to the second solution over a period of approximately 5 /2 minutes with good stirring, the temperature having beenmaintained at 70 C.
- the dispersion was then stirred for 20 minutes at 70 C. and cooled at 40 C.
- Example 4 A dispersion of silver halide was prepared in substantially the same manner as described in Example 3 but 59 grams of a hexahydrophthalic anhydride derivative of gelatin was employed instead of the n-heptyl succinic anhydride gelatin derivative. The coagulation was induced by the use of lanthanum nitrate rather than cadmium chloride. The emulsion finally obtained was coated onto a cellulose acetate film support and Was exposed and developed as in the preceding example. The emulsion was found to have the following characteristics:
- the salts which may be employed for coagulating silver halide dispersions in accordance with my invention may be any of the water soluble salts of the metal referred to. This would include the nitrates or chlorides of all of the metals listed although in many cases other salts would be useful providing the negative ion of the salt does not have any adverse eifect photographically or otherwise on the silver halide dispersion.
- a process of preparing a washed silver halide dispersion the steps which comprise preparing a dispersion of silver halide in an aqueous solution of a gelatin derivative selected from the group consisting of the aromatic sulfonyl chloride derivatives of gelatin, the carboxylic acid chloride derivatives of gelatin, the carboxylic acid anhydride derivatives of gelatin and the aromatic isocyanate derivatives of gelatin, coagulating that dispersion while at a pH of 4.5- by adding thereto 1/2-20 grams, per mole of silver halide, of a water soluble salt selected from the water soluble salts of cadmium, zinc, aluminum, iron, nickel, chromium and lanthanum whereby silver halide-gelatin granules form and separating those granules from the liquid portion of the mass.
- a gelatin derivative selected from the group consisting of the aromatic sulfonyl chloride derivatives of gelatin, the carboxylic acid chloride derivatives of
- a method of preparing a washed silver halide dispersion the steps which comprise forming a dispersion of silver halide in an aqueous solution of a benzene sulfonyl chloride gelatin derivative, coagulaing that dispersion while at a pH of 4.5l0 by adding thereto an aqueous solution of 1/2-20 grams per mole of silver halide of a salt selected from the water soluble salts of cadmium, zinc, aluminum, iron, nickel, chromium and lanthanum whereby silver halide-gelatin granules are formed and separating the thus formed granules from the liquid portion of the mass.
- a method of preparing washed silver halide dispersions the step which comprises forming a dispersion of silver halide in an aqueous solution of hexa hydro phthalic anhydride-gelatin derivative, coagulating that dispersion while at a pH of 4.5-10 with 1/2-20 grams of lanthanum nitrate per mole of silver halide whereby silver halide-gelatin granules are formed and separating those granules from the liquid portion of the mass.
- a method of preparing washed silver halide dispersions the steps which comprise forming a dispersion of silver halide in an aqueous solution of a N-heptyl succinyl anhydride derivative of gelatin, coagulating that dispersion while at a pH of 4.5-10 by adding thereto an aqueous solution of 1/2-20 grams of cadmium chloride per mole of silver halide whereby silver halide-gelatin granules are formed and separating those granules from the liquid portion of the mass.
- a method of preparing washed silver halide dispersions the steps which comprise forming a dispersion of silver halide in an aqueous solution of a benzene sulfonyl chloride derivative of gelatin, coagulating the silver halide dispersion while at a pH greater than 4.5 and not more than 10 by adding thereto an aqueous solution of 1/2-20 grams of cadmium chloride per mole of silver halide whereby silver halide-gelatin granules are formed and separating those granules from the liquid portion of the mass.
- a method of preparing a washed silver halide dispersion the steps which comprise forming a dispersion of a silver halide in an aqueous solution of a gelatin derivative selected from the group consisting of the aromatic sulfonyl chloride derivatives of gelatin, the carboxylic acid chloride derivatives of gelatin, the carboxylic acid anhydride derivatives of gelatin and the aromatic isocyanate derivatives of gelatin, coagulating the silver halide dispersion while at a pH of 4.5-10 by adding thereto an aqueous solution of 1/2-20 grams of cadimum chloride per mole of silver halide whereby silver halide-gelatin granules are formed and separating those granules from the liquid portion of the mass.
- a gelatin derivative selected from the group consisting of the aromatic sulfonyl chloride derivatives of gelatin, the carboxylic acid chloride derivatives of gelatin, the carboxylic acid anhydride derivatives of gelatin and the aromatic
- a gelatin derivative selected from the group consisting of the aromatic sulfonyl chloride derivatives of gelatin, the carboxylic acid chloride derivatives of gelatin, the carboxylic acid anhydride derivatives of gelatin and the aromatic isocyanate derivatives of gelatin, having a pH of 4.5-10 coagulating that dispersion without adjustment of the pH thereof by adding thereto 1/ 2-20 grams per mole of silver halide of a water soluble cadmium salt whereby silver halide-gelatin granules form and separating those granules from the liquid portion of the mass.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Colloid Chemistry (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE535054D BE535054A (enrdf_load_stackoverflow) | 1954-01-25 | ||
| US406061A US2768079A (en) | 1954-01-25 | 1954-01-25 | Method of preparing washed photographic emulsions |
| FR1121979D FR1121979A (fr) | 1954-01-25 | 1955-01-21 | Procédé pour la préparation de dispersions d'halogénures d'argent et d'émulsions photo-sensibles contenant ces dispersions et nouveaux produits obtenus |
| GB1942/55A GB764446A (en) | 1954-01-25 | 1955-01-21 | Improvements in the preparation of photographic silver halide emulsions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US406061A US2768079A (en) | 1954-01-25 | 1954-01-25 | Method of preparing washed photographic emulsions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2768079A true US2768079A (en) | 1956-10-23 |
Family
ID=23606386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US406061A Expired - Lifetime US2768079A (en) | 1954-01-25 | 1954-01-25 | Method of preparing washed photographic emulsions |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2768079A (enrdf_load_stackoverflow) |
| BE (1) | BE535054A (enrdf_load_stackoverflow) |
| FR (1) | FR1121979A (enrdf_load_stackoverflow) |
| GB (1) | GB764446A (enrdf_load_stackoverflow) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2950972A (en) * | 1954-11-24 | 1960-08-30 | Gen Aniline & Film Corp | Photographic emulsions having increased sensitivity to x-ray and gamma ray radiation |
| US2965484A (en) * | 1956-03-26 | 1960-12-20 | Gen Aniline & Film Corp | Mixed packet photographic emulsions |
| US3000739A (en) * | 1957-04-02 | 1961-09-19 | Du Pont | Process for preparing silver halide emulsions |
| US3075841A (en) * | 1956-06-19 | 1963-01-29 | Du Pont | Mordant treating process and elements containing same |
| US3178289A (en) * | 1960-08-17 | 1965-04-13 | Gen Aniline & Film Corp | Photomechanical emulsions containing rare-earth metal salts |
| US3185571A (en) * | 1960-05-14 | 1965-05-25 | Gevaert Photo Production N V | Process of preserving photographic gelatinous compositions from decomposition |
| US3359110A (en) * | 1964-04-13 | 1967-12-19 | Eastman Kodak Co | Use of organic amides as anti-coagulants in emulsions prepared by the gelatin derivative coagulation wash procedure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2614929A (en) * | 1947-08-13 | 1952-10-21 | Eastman Kodak Co | Method of preparing photographic emulsions |
| US2618556A (en) * | 1947-11-19 | 1952-11-18 | Eastman Kodak Co | Process for preparing photographic emulsions |
-
0
- BE BE535054D patent/BE535054A/xx unknown
-
1954
- 1954-01-25 US US406061A patent/US2768079A/en not_active Expired - Lifetime
-
1955
- 1955-01-21 FR FR1121979D patent/FR1121979A/fr not_active Expired
- 1955-01-21 GB GB1942/55A patent/GB764446A/en not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2614929A (en) * | 1947-08-13 | 1952-10-21 | Eastman Kodak Co | Method of preparing photographic emulsions |
| US2614928A (en) * | 1947-08-13 | 1952-10-21 | Eastman Kodak Co | Method of preparing photographic emulsions |
| US2618556A (en) * | 1947-11-19 | 1952-11-18 | Eastman Kodak Co | Process for preparing photographic emulsions |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2950972A (en) * | 1954-11-24 | 1960-08-30 | Gen Aniline & Film Corp | Photographic emulsions having increased sensitivity to x-ray and gamma ray radiation |
| US2965484A (en) * | 1956-03-26 | 1960-12-20 | Gen Aniline & Film Corp | Mixed packet photographic emulsions |
| US3075841A (en) * | 1956-06-19 | 1963-01-29 | Du Pont | Mordant treating process and elements containing same |
| US3000739A (en) * | 1957-04-02 | 1961-09-19 | Du Pont | Process for preparing silver halide emulsions |
| US3185571A (en) * | 1960-05-14 | 1965-05-25 | Gevaert Photo Production N V | Process of preserving photographic gelatinous compositions from decomposition |
| US3178289A (en) * | 1960-08-17 | 1965-04-13 | Gen Aniline & Film Corp | Photomechanical emulsions containing rare-earth metal salts |
| US3359110A (en) * | 1964-04-13 | 1967-12-19 | Eastman Kodak Co | Use of organic amides as anti-coagulants in emulsions prepared by the gelatin derivative coagulation wash procedure |
Also Published As
| Publication number | Publication date |
|---|---|
| GB764446A (en) | 1956-12-28 |
| FR1121979A (fr) | 1956-08-29 |
| BE535054A (enrdf_load_stackoverflow) |
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