US2184053A - Stable compositions useful in the compounding of photographic developers - Google Patents
Stable compositions useful in the compounding of photographic developers Download PDFInfo
- Publication number
- US2184053A US2184053A US264847A US26484739A US2184053A US 2184053 A US2184053 A US 2184053A US 264847 A US264847 A US 264847A US 26484739 A US26484739 A US 26484739A US 2184053 A US2184053 A US 2184053A
- Authority
- US
- United States
- Prior art keywords
- water
- grams
- solution
- sodium
- formaldehyde
- 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
- 239000000203 mixture Substances 0.000 title description 28
- 238000013329 compounding Methods 0.000 title description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 80
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 54
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 52
- 239000000243 solution Substances 0.000 description 40
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 30
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 28
- 229960004279 formaldehyde Drugs 0.000 description 27
- 235000010265 sodium sulphite Nutrition 0.000 description 26
- 229930040373 Paraformaldehyde Natural products 0.000 description 25
- 235000019256 formaldehyde Nutrition 0.000 description 25
- 229920002866 paraformaldehyde Polymers 0.000 description 24
- 239000003513 alkali Substances 0.000 description 20
- 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 18
- 239000003795 chemical substances by application Substances 0.000 description 18
- 239000011734 sodium Substances 0.000 description 18
- 229910052708 sodium Inorganic materials 0.000 description 18
- 239000002253 acid Substances 0.000 description 15
- 239000007787 solid Substances 0.000 description 14
- 239000004327 boric acid Substances 0.000 description 9
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 8
- 238000006116 polymerization reaction Methods 0.000 description 7
- 239000011550 stock solution Substances 0.000 description 7
- 230000003472 neutralizing effect Effects 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 4
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 description 4
- WLJVXDMOQOGPHL-UHFFFAOYSA-N phenylacetic acid Chemical compound OC(=O)CC1=CC=CC=C1 WLJVXDMOQOGPHL-UHFFFAOYSA-N 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 239000011973 solid acid Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- IKWTVSLWAPBBKU-UHFFFAOYSA-N a1010_sial Chemical compound O=[As]O[As]=O IKWTVSLWAPBBKU-UHFFFAOYSA-N 0.000 description 3
- 229960002594 arsenic trioxide Drugs 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 159000000011 group IA salts Chemical class 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 235000011090 malic acid Nutrition 0.000 description 3
- BGJSXRVXTHVRSN-UHFFFAOYSA-N 1,3,5-trioxane Chemical group C1OCOCO1 BGJSXRVXTHVRSN-UHFFFAOYSA-N 0.000 description 2
- DETXZQGDWUJKMO-UHFFFAOYSA-N 2-hydroxymethanesulfonic acid Chemical compound OCS(O)(=O)=O DETXZQGDWUJKMO-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 235000019270 ammonium chloride Nutrition 0.000 description 2
- 150000003863 ammonium salts Chemical class 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- GOLCXWYRSKYTSP-UHFFFAOYSA-N arsenic trioxide Inorganic materials O1[As]2O[As]1O2 GOLCXWYRSKYTSP-UHFFFAOYSA-N 0.000 description 2
- 150000001642 boronic acid derivatives Chemical class 0.000 description 2
- 239000000337 buffer salt Substances 0.000 description 2
- 239000006172 buffering agent Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 description 2
- WBZKQQHYRPRKNJ-UHFFFAOYSA-L disulfite Chemical compound [O-]S(=O)S([O-])(=O)=O WBZKQQHYRPRKNJ-UHFFFAOYSA-L 0.000 description 2
- -1 for example Substances 0.000 description 2
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 2
- 229960002449 glycine Drugs 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 description 2
- SOUHUMACVWVDME-UHFFFAOYSA-N safranin O Chemical compound [Cl-].C12=CC(N)=CC=C2N=C2C=CC(N)=CC2=[N+]1C1=CC=CC=C1 SOUHUMACVWVDME-UHFFFAOYSA-N 0.000 description 2
- PTLRDCMBXHILCL-UHFFFAOYSA-M sodium arsenite Chemical compound [Na+].[O-][As]=O PTLRDCMBXHILCL-UHFFFAOYSA-M 0.000 description 2
- 239000008247 solid mixture Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000002906 tartaric acid Nutrition 0.000 description 2
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- 239000004135 Bone phosphate Substances 0.000 description 1
- 101100184147 Caenorhabditis elegans mix-1 gene Proteins 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- WHUUTDBJXJRKMK-GSVOUGTGSA-N D-glutamic acid Chemical compound OC(=O)[C@H](N)CCC(O)=O WHUUTDBJXJRKMK-GSVOUGTGSA-N 0.000 description 1
- 229930182847 D-glutamic acid Natural products 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- 239000004471 Glycine Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-L Phosphate ion(2-) Chemical compound OP([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-L 0.000 description 1
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000019846 buffering salt Nutrition 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 235000013905 glycine and its sodium salt Nutrition 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000001630 malic acid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000403 monosodium phosphate Inorganic materials 0.000 description 1
- 235000019799 monosodium phosphate Nutrition 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229960003424 phenylacetic acid Drugs 0.000 description 1
- 239000003279 phenylacetic acid Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 description 1
- 235000019266 sodium hydrogen malate Nutrition 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 239000001394 sodium malate Substances 0.000 description 1
- NVIFVTYDZMXWGX-UHFFFAOYSA-N sodium metaborate Chemical compound [Na+].[O-]B=O NVIFVTYDZMXWGX-UHFFFAOYSA-N 0.000 description 1
- DOJOZCIMYABYPO-UHFFFAOYSA-M sodium;3,4-dihydroxy-4-oxobutanoate Chemical compound [Na+].OC(=O)C(O)CC([O-])=O DOJOZCIMYABYPO-UHFFFAOYSA-M 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000011975 tartaric acid Substances 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
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
- G03C5/264—Supplying of photographic processing chemicals; Preparation or packaging thereof
- G03C5/265—Supplying of photographic processing chemicals; Preparation or packaging thereof of powders, granulates, tablets
Definitions
- formaldehyde may be added to a above-'mentioned dificulties involved in the use of paraformaldehyde as a source of alkali in a developing bath.
- a further object is to provide a means whereby a solid polymer of formaldehyde, such as paraformaldehyde, may be employed in aqueous solution in connection with sodium sulflte without the resulting formaldehyde undergoing polymerization and thus decreasing I the source of formaldehyde in the solution.
- Another and specific object is to provide in crystalline or powder form a composition which, when dissolved in water, will provide an appropriate source of formaldehyde for addition to a solution containing a photographic developing agent and sodium sulflte.
- a further specific object is to provide a two-package photographic developer which may be sold in dry form and adapted for the making up of two stock solutions and the, preparation of the developing bath itself. Other objects will appear hereinafter.
- a composition in dry powder form possessing the ability to be dissolved in water to produce a stable formaldehyde stock solution may be compounded by mixing in appropriate proportions paraformaldehyde sodium, suliite and a solid acid such as boric, glutamic, phenylacetic, citric, tartaric, malic acids or a buffering salt such as the alkali metabisulfites, the alkali bisulfites, the alkali borates, metaborates, monoand di-sodium phosphate, and the like.
- Ammonium salts such as ammonium chloride are also suitable neutralizing saltsin the presence of the formaldehyde. I have found that such dry powdered compositions are stable, readily handled, and when simply dissolved in water in appropriate proportions, provide a highly satisfactory and stable formaldehyde stock solution which is not subject to loss of formaldehyde by polymerization.
- the paraformaldehyde of M commerce is insoluble in water, but readily soluble in solutions of alkalis and solutions of sodium sulfite.
- the main difllculty has been that the excess alkali required to get the paraformaldehyde into solution results in the above-mentioned polymerization.
- the present; invention is based upon the concept of neutralizing the alkali by a suitable acid or bufler salt after the paraformaldehyde' has been placed in solution.
- the excess alkali may be removed from the solution by a straight neutralization reaction' or the solution may be buffered by means of dior tri-basic acids or suitable bufiering salts such as those indicated above.
- the solution then consists essentially of formaldehyde and water at a definite pH depending upon the composition of the bath.
- the total concentration of alkali in the solution be as low as possible. While no definite low limit of pH of the solution can be set, this may be as low as two or three, the preferred range being from 3 to 11.
- examples also include references to a typical composition which may be employed as the source of the developing agent. These two compositions may be referred to as the A composition and the B composition, the A composition being the source of the developing agent per se and the B composition being the source of the formaldehyde.
- Example 1 B Paraformaldehyde .(trioxymethylene) grams 30 Sodium sulfite (desiccated) gram 1 Potassium metabisulflte (cryst.)
- Example 2 B Paraformaldehyde ..grams 30 Sodium sulflte (disc.) gram 1 Sodium bisulfite (cryst.) grams 9.4 Water (about 100 F.) to make.. liter 1 A. Same composition as A COW tof
- Example 3 B Paraformaldehyde grams 30 Sodium carbonate (desiccated) do.. 10 Sodium bicarbonate do 40 Water (about 100 F.) to make liter 1 A. Water (about 125 F.) (52 C.) liters 2.0 Sodium sulfite, desiccated grams 120.0
- Example 4 B Paraformaldehyde grams 30 Sodium sulflte (desiccated)' do 20 Resorcinol do 32 Water (about 100 F.) to make liter 1 A. Sodium sulfite (desiccated) grams 100 Hydroquinone .do Potassium bromide do 6.3 Water (about 125 F.) to make liters 3
- Example 5 B Paraiormaldehyde grams 30 Sodium metaborate (Na2BzO4.8H2O) I grams-.. 15 Water (about F.) to make liter 1 A.
- Example 8 B Para-formaldehyde grams 30 Sodium sulfite (desc) 'do 24 Malic acid (crystals) do 12.! Water (about 100 F.) to make liter.. l
- Example 9 B Paraformaldehyde grams 30 Sodium sulflte (desc do 11.9 Sodiumhydrogen malate (cryst.) do 14.8 Water (about 100 F.) to make liter- 1 A. Water (about 125 F.) (52 C.) liters 2.0 Sodium sulfite. desiccated grams 120.0 Borlc acid do 30.0 Hydroquinone do 90.0 Potassium bromide do 6 3 Cold water to make liters Example 10 Sodium sulfite "grams-.. Paraformaldehyde do Ammonium chloride cryst do- Water to make "liter-..
- solution B is added to three parts of solution A 79 to make up the developing bath.
- a solid acid salt or acid having a relatively large particle size should be employed 140 in compounding'the dry composition in accord- 90 once with the present invention, since the rate of 30 solution of the acid salt or acid should not be in excess of the rate of solution of the paraform- 3 aldehyde and sodium sulfiter If it is desired to use a solid acid in a relatively fine state of subdivision or small particle-size, agglomeration of the acid with suitable ln'ert binder may be desirable in order to reduce its rate of solution below 0 that of the paraformaldehyde.
- alkali bi-sulfites may be substituted by the alkali metabisulfite and other acid salts or acids may be substituted for the metabisulfite.
- the alkali sulflte may likewise be replaced with n 9 an alkali carbonate or other soluble alkaline salt 30') if proper provision is made for neutralizing or decreasing the alkalinity of the solution by use of an acid or buffer salt as herein set forth.
- Various fog-restraining or inhibiting substances may be added to either of'the dry compositions, such as phenosafranine, Pinakryptol 2.0 Green, arsenious oxide, or the alkali salts of 120.0 arsenious acid such as sodium arsenite, potassium 30.0 ferrocyanide or other alkali ferrocyanides and 90.0 others.
- phenosafranine varying 6.3 amounts may be used, but a suitable restraining 3.0 vaction is obtained when about one part in 150,000 parts of the mixed developer is used.
- arsenious oxide sodium arsenite or 300 similar compounds, two grams per liter give representative and satisfactory results.
- the present invention has many advantages, 1 the chief of which is the fact that it is possible to provide a two-package developer in dry form 2.0 in which the package containing the source of 1203 formaldehyde is provided with a means of stabilizing the formaldehyde when dissolved to make 909 up the B solution.
- my invention one is thus 6.3 enabled to purchase the dry material in a form in which it does not deteriorate, either in the package or in the stock solution when made up.
- the solid compositions of my invention constitute an entirely distinot and separate entity from the aqueous solutions resulting from dissolving these materials in water.
- the dry mix- 1 ture contains certain specific chemicals, many of 2.0 these more or less completely lose their identity 120.0 in solution.
- photographic solutions are rather highly complex in their composi- 90.0 tion and the ingredients must be present in def- 6.3 inite and exact proportions in order to obtain the 3.0 desired result.
- a composition in solid form adapted to dissolve in water for the purpose of providing in- Solution a suitable source of formaldehyde for addition to a solution containing a developing agent and sodium suliite to prepare a photographic developing bath, said composition comprising paraformaldehyde, an alkaline salt. and a solid agent adapted to act as aneutralizlng or buffering agent.
- a composition in solid form adapted to diesolve in water for the purpose of providing in solution a suitable source of formaldehyde for addition to a solution containing a developing agent and sodium sulflte to prepare a photographic developing bath, said composition comprising paraiormaldehyde, sodium sulfite, and a solid agent adapted to act as a neutralizing or bufiering agent.
- a composition in solid form adapted to dissolve in water for the purpose of providing in solution a suitable source of formaldehyde for addition to a solution containing a developing agent and sodium sulflte to prepare a developing bath, said composition comprising paraformaldehyde, an alkaline salt, and a solid agent adapted to dissolve more slowly than the'other constituents and act as a neutralizing or buffering agent.
- a composition in solid form adapted to dissolve in water for the purpose of providing in solution a suitable source of formaldehyde tor addition to a solution containing a developing agent and sodium sulfite to prepare a developing bath, said composition comprising paraformaldehyde, sodium sulflte, and a solid agent adapted to dissolve more slowly than the other constltuents and act as a neutralizing or bufiering agent.
- the solid agent is a salt selected from the group consisting of the alkali metabisulfites, the alkali borates, alkali metaborates, and the monoand di-sodium phosphates.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR958661D FR958661A (en, 2012) | 1939-03-29 | ||
| US264847A US2184053A (en) | 1939-03-29 | 1939-03-29 | Stable compositions useful in the compounding of photographic developers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US264847A US2184053A (en) | 1939-03-29 | 1939-03-29 | Stable compositions useful in the compounding of photographic developers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2184053A true US2184053A (en) | 1939-12-19 |
Family
ID=23007868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US264847A Expired - Lifetime US2184053A (en) | 1939-03-29 | 1939-03-29 | Stable compositions useful in the compounding of photographic developers |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2184053A (en, 2012) |
| FR (1) | FR958661A (en, 2012) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2506622A (en) * | 1944-03-11 | 1950-05-09 | Technicolor Motion Picture | Elimination of preservative sulfite from photographic developers prior to use in color development |
| US2602757A (en) * | 1948-04-09 | 1952-07-08 | Morris S Kantrowitz | Method and composition for producing silver coatings |
| US2805947A (en) * | 1954-05-10 | 1957-09-10 | Records Service Corp | Photographic developer |
| US3050392A (en) * | 1958-08-01 | 1962-08-21 | Mergenthaler Linotype Gmbh | Oxidation-stable developer compositions |
| US3284199A (en) * | 1963-05-02 | 1966-11-08 | Du Pont | Buffered stop bath for interrupted photographic development |
| US3400079A (en) * | 1966-12-12 | 1968-09-03 | Riegel Textile Corp | Formaldehyde absorbent composition |
-
0
- FR FR958661D patent/FR958661A/fr not_active Expired
-
1939
- 1939-03-29 US US264847A patent/US2184053A/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2506622A (en) * | 1944-03-11 | 1950-05-09 | Technicolor Motion Picture | Elimination of preservative sulfite from photographic developers prior to use in color development |
| US2602757A (en) * | 1948-04-09 | 1952-07-08 | Morris S Kantrowitz | Method and composition for producing silver coatings |
| US2805947A (en) * | 1954-05-10 | 1957-09-10 | Records Service Corp | Photographic developer |
| US3050392A (en) * | 1958-08-01 | 1962-08-21 | Mergenthaler Linotype Gmbh | Oxidation-stable developer compositions |
| US3284199A (en) * | 1963-05-02 | 1966-11-08 | Du Pont | Buffered stop bath for interrupted photographic development |
| US3400079A (en) * | 1966-12-12 | 1968-09-03 | Riegel Textile Corp | Formaldehyde absorbent composition |
Also Published As
| Publication number | Publication date |
|---|---|
| FR958661A (en, 2012) | 1950-03-17 |
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