US3162534A - Photographic developer - Google Patents
Photographic developer Download PDFInfo
- Publication number
- US3162534A US3162534A US205215A US20521562A US3162534A US 3162534 A US3162534 A US 3162534A US 205215 A US205215 A US 205215A US 20521562 A US20521562 A US 20521562A US 3162534 A US3162534 A US 3162534A
- Authority
- US
- United States
- Prior art keywords
- developer
- solution
- grams
- potassium
- water
- 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
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 14
- 239000007864 aqueous solution Substances 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 8
- 229910052783 alkali metal Inorganic materials 0.000 claims description 7
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims description 6
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims description 3
- SRPOMGSPELCIGZ-UHFFFAOYSA-N disulfino carbonate Chemical compound OS(=O)OC(=O)OS(O)=O SRPOMGSPELCIGZ-UHFFFAOYSA-N 0.000 claims description 3
- 150000001340 alkali metals Chemical class 0.000 claims 1
- 239000000243 solution Substances 0.000 description 47
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 31
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 22
- 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 14
- -1 silver halide Chemical class 0.000 description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 11
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 10
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 9
- 239000011734 sodium Substances 0.000 description 9
- 235000019441 ethanol Nutrition 0.000 description 8
- 229910052708 sodium Inorganic materials 0.000 description 8
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 8
- 235000010265 sodium sulphite Nutrition 0.000 description 8
- DETXZQGDWUJKMO-UHFFFAOYSA-N 2-hydroxymethanesulfonic acid Chemical compound OCS(O)(=O)=O DETXZQGDWUJKMO-UHFFFAOYSA-N 0.000 description 7
- 208000015181 infectious disease Diseases 0.000 description 7
- 230000002458 infectious effect Effects 0.000 description 7
- 235000019252 potassium sulphite Nutrition 0.000 description 7
- 238000007792 addition Methods 0.000 description 6
- BHZRJJOHZFYXTO-UHFFFAOYSA-L potassium sulfite Chemical compound [K+].[K+].[O-]S([O-])=O BHZRJJOHZFYXTO-UHFFFAOYSA-L 0.000 description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- 229910001413 alkali metal ion Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910052700 potassium Inorganic materials 0.000 description 4
- 239000011591 potassium Substances 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- 229940001482 sodium sulfite Drugs 0.000 description 4
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 3
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 3
- 239000004327 boric acid Substances 0.000 description 3
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 3
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 2
- 235000002566 Capsicum Nutrition 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 239000006002 Pepper Substances 0.000 description 2
- 241000722363 Piper Species 0.000 description 2
- 235000016761 Piper aduncum Nutrition 0.000 description 2
- 235000017804 Piper guineense Nutrition 0.000 description 2
- 235000008184 Piper nigrum Nutrition 0.000 description 2
- MYTMXVHNEWBFAL-UHFFFAOYSA-L dipotassium;carbonate;hydrate Chemical compound O.[K+].[K+].[O-]C([O-])=O MYTMXVHNEWBFAL-UHFFFAOYSA-L 0.000 description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 2
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229940101006 anhydrous sodium sulfite Drugs 0.000 description 1
- ABTBNRULIDMHLT-UHFFFAOYSA-N benzene-1,4-diol;formaldehyde;sulfurous acid Chemical compound O=C.OS(O)=O.OC1=CC=C(O)C=C1 ABTBNRULIDMHLT-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- ALVGPPOPGPCDCG-UHFFFAOYSA-M potassium;formaldehyde;hydrogen sulfite Chemical compound [K+].O=C.OS([O-])=O ALVGPPOPGPCDCG-UHFFFAOYSA-M 0.000 description 1
- 239000000837 restrainer Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- WUUHFRRPHJEEKV-UHFFFAOYSA-N tripotassium borate Chemical compound [K+].[K+].[K+].[O-]B([O-])[O-] WUUHFRRPHJEEKV-UHFFFAOYSA-N 0.000 description 1
- 239000012224 working solution 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
- G03C5/29—Development processes or agents therefor
- G03C5/30—Developers
-
- 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
- G03C5/29—Development processes or agents therefor
- G03C5/31—Regeneration; Replenishers
Definitions
- pepper spots often develop, as reported by Yule, in Journal of the Franklin Institute, March 1945, pages 221 to 230. It has now been found that such pepper spots often become prevalent when such developers are prepared from concentrated solutions which include an alcohol, such as ethyl alcohol, diethylene glycol or mcnomethyl ether of ethylene glycol; and the developing process and reenergizer of the present invention are not limited to such alcohol-containing developers, but extend the useful life of formaldehyde bisulfite developers in general.
- an alcohol such as ethyl alcohol, diethylene glycol or mcnomethyl ether of ethylene glycol
- replenishers for photographic developers generally comprise a substantial quantity of a developing agent, such as hydroquinone; enough suliite, such as sodium sulfite, to prevent aerial oxidation of the developing agent; and an alkaline material, such as sodium hydroxide or carbonate, sufii cient to restore the partially exhausted developer bath to approximately its original activity.
- a developing agent such as hydroquinone
- suliite such as sodium sulfite
- an alkaline material such as sodium hydroxide or carbonate
- an infectious developer bath consisting essentially of a water solution of hydroquinone as the sole developing agent, carbonyl-alkali metal bisulfite, preferably formaldehyde-alkali metal bisulfite, alkali metal hydroxide, carbonate or borate and a restrainer such as potassium bromide
- a restrainer such as potassium bromide
- the infectious de 'eloper bath after it has been partially exhausted and would normally be discarded, may be reenergized and restored to substantially its original activity by mixing with it a small amount of the reenergizer, and the capacity of the developer bath may be increased to as much as 3, 4 or more times its normal capacity.
- the present invention has for its object the provision of novel and improved method of reenergizing and greatly extending the useful life of an infectious developer bath.
- a further object is the provision of a novel and improved reenergizing solution for partially exhausted infectious developer baths.
- Another object is the provision of a novel and improved method of preventing undesired spots when using formaldehyde-bisulfite developers which include an alcohol in their composition.
- Still another object is the provision or" a novel and improved reenergizing solution by which an infectious developing bath may be maintained at good Working standards over a greatly extended film capacity, thereby resulting in greater economy and more uniform developed negatives.
- baths of litho developers may be reenergized after their normal useful life by adding to them small amounts of a concentrated aqueous solution of a sulfite ion and an alkali.
- a concentrated aqueous solution of a sulfite ion and an alkali comprises sulfite ions, hydroxyl ions and one or more alkali metal ions, such as sodium and potassium.
- alkali metal ions such as sodium and potassium.
- a mixture of different alkali metal ions are preferred so that the reenergizing solution may be more concentrated, although either sodium or potassium ions alone may be employed.
- the reenergizing solution consists of sodium or potassium sulfite or bisulfite and sodium or potassium hydroxide or carbonate, preferably sodium, potassium, sulfite and hydroxide ions.
- This may be provided by a concentrated water solution of sodium sulfite and potassium hydroxide, such solution being as concentrated as can be reliably stored and shipped without crystalliza tion.
- Typical of the formaldehydebisullite developers which may be used in the process of the present invention are those compounded within the ranges of the following general formula: i
- the quantity of the alkali used is chosen so that a pH range between 9.8 and 10.8 is obtained.
- Reenergizers for such litho developers consist essentially of a concentrated water solution of sodium and potassium llOIlS and of hydroxyl ions and sulfite ions, and are preferably composed of sodium or potassium hydroxide or carbonate and/ or borate and sodium or potassium suliite or bisulfite, the alkali metal ions preferably being mixed.
- a solution may consist of:
- Typical of the infectious developers which are usually reenergized by the method of the present invention are the following; with respect to each of which the preferred reenergizer solution and its manner of use is specified:
- Example 1 Solution A Formaldehyde potassium bisulfite monohydrate grams 110 Hydroquinone do 135 7 Potassium hydroxide 45% water solution ml 2.8 Diethylene glycol ml 118 Ethylene diarnine tetracetic acid grams 0.26 Water to make 1000 ml.
- equal parts A and B are mixed and diluted with 4 parts of water to make six liters of working developer for development of litho film.
- Potassium borate (anhydrous) "grams-.. 160 Potassium carbonate sesquihydrate do 204 Potassium bromide do 11.0
- solution A and one part of solution B are mixed and diluted with 3 to 5 volumes of water based on the total volume of A and B solutions to. make 7 the working solution for development of litho film.
- This developer bath may be reenergized several times v 4 by the addition to the bath of 5 to 40 cc. replenishing solution consisting of:
- one part of A is mixed with six parts of water and with one part of B to make a working developer.
- the reenergizer may comprise:
- one part of A and one part of B are added to two parts of water and mixed.
- Example 5 Another example of a litho developer and its reenergizer according to the present invention is as follows:
- solutions A and B are mixed, and may be reenergized by additions of the energizer solution C.
- Example 6 Still another infectious developer and its reenergizing solution have the following formulation:
- Equal parts of solutions A and B are mixed for use.
- the developer When somewhat exhausted, the developer may be reenergized by adding 10 to 50 ml. of the Solution C per liter of developer, and may be repeated several times.
- the renergizing solutions are preferably highly concentrated but may be diluted, so long as the working developer is not seriously diluted by their addition.
- a solution such as Solution C of Example 1 may be diluted with 5 parts of water and from 150 to 1200 ml. used for each six liters of partially used Working developer.
- such dilution impairs the working developer, and for that reason, the reenergizer should be as concentrated as is practically possible.
- a process for reenergizing and maintaining the activity of a hydroquinone containing carbonyl-bisulfite developer for lithographic film the hydroquinone being the sole developing agent, which comprises adding to the developer, after some film has been developed therein, an aqueous solution consisting essentially of from 0.5 to 10 grams of an alkali metal sulfite and from 0.1 to 3.2 grams of an alkali metal hydroxide per liter of developer, the said aqueous solution being substantially free of hydroquinone and other organic developing agents.
- a process for reenergizing and maintaining the activity of a hydroquinone containing carbonyl-bisulfite developer for lithographic film the hydroquinone being the sole developing agent, which comprises periodically adding to the developer, per liter of developer, from about 5 to 50 cc. of an aqueous solution consisting essentially of from 100 to 250 grams per liter of an alkali metal sulfite and from 20 to grams per liter of an alkali metal hydroxide, the said aqueous solution being substantially free of hydroquinone and other organic developing agents.
- a process for reenergizing and extending the activity of a used hydroquinone-containing formaldehyde-alkali metal-bisulfite developer for lithographic film the hydroquinone being the sole developing agent, which comprises periodically adding to the developer, per liter of developer, from about 5 to 50 cc. of aqueous solution consisting essentially of from to 250 grams per liter of an alkali metal sulfite and from 20 to 80 grams per liter of an alkali metal hydroxide, the said aqueous solution being substantially free of hydroquinone and other organic developing agents.
- a process as in claim 4 wherein the alcohol is selected from the group consisting of diethylene glycol and triethylene glycol.
- a re-energizing solution for periodic addition to a carbonyl-alkali metal-bisulfite developer having hydroquinone as its sole developing agent consisting essentially of an aqueous solution of sulfite and hydroxyl ions and associated alkali metal ions selected from the group of salts consisting of sodium and potassium sulfites in a quantity of from 100 to 250 grams per liter and sodium and potassium hydroxide of from 20 to 80 grams per liter.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE631419D BE631419A (en)) | 1962-05-14 | ||
| NL292635D NL292635A (en)) | 1962-05-14 | ||
| US205215A US3162534A (en) | 1962-05-14 | 1962-06-26 | Photographic developer |
| CH1070962A CH433008A (fr) | 1962-05-14 | 1962-09-10 | Procédé pour la régénération de l'activité d'un révélateur |
| FR909043A FR1333404A (fr) | 1962-05-14 | 1962-09-10 | Procédé d'utilisation et de régénération d'un bain révélateur et compositionsemployées |
| LU42330D LU42330A1 (en)) | 1962-05-14 | 1962-09-10 | |
| GB8509/63A GB1035034A (en) | 1962-05-14 | 1963-03-04 | Photographic developers |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US19503062A | 1962-05-14 | 1962-05-14 | |
| US205215A US3162534A (en) | 1962-05-14 | 1962-06-26 | Photographic developer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3162534A true US3162534A (en) | 1964-12-22 |
Family
ID=26890639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US205215A Expired - Lifetime US3162534A (en) | 1962-05-14 | 1962-06-26 | Photographic developer |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3162534A (en)) |
| BE (1) | BE631419A (en)) |
| CH (1) | CH433008A (en)) |
| GB (1) | GB1035034A (en)) |
| LU (1) | LU42330A1 (en)) |
| NL (1) | NL292635A (en)) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3345174A (en) * | 1965-08-02 | 1967-10-03 | Charles R Dotson | Rapid access photographic process |
| US3346386A (en) * | 1962-12-17 | 1967-10-10 | Agfa Ag | Polycondensation products of phosphoric acid amides with aliphatic polyethers as developer adjuvants |
| US3617284A (en) * | 1966-09-19 | 1971-11-02 | Agfa Gevaert Nv | Development process for lith-type emulsion with n-vinyl 2-pyrrolidone polymer |
| US4329042A (en) * | 1978-01-17 | 1982-05-11 | Ciba-Geigy Ag | Method and apparatus for regenerating photographic processing solution |
| US4476213A (en) * | 1982-12-10 | 1984-10-09 | The Mead Corporation | Non-aqueous silver halide diffusion imaging system |
| US4507381A (en) * | 1982-12-10 | 1985-03-26 | The Mead Corporation | Non-aqueous silver halide diffusion imaging system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1551561A2 (en) | 2002-10-10 | 2005-07-13 | Monsanto Europe S.A. | New spray bottle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2705187A (en) * | 1953-07-16 | 1955-03-29 | Allied Chem & Dye Corp | Manufacture of sodium sulfide and sulfite |
| US3030209A (en) * | 1958-07-02 | 1962-04-17 | Eastman Kodak Co | High-contrast photographic silver chloride emulsions and method of processing |
-
0
- NL NL292635D patent/NL292635A/xx unknown
- BE BE631419D patent/BE631419A/xx unknown
-
1962
- 1962-06-26 US US205215A patent/US3162534A/en not_active Expired - Lifetime
- 1962-09-10 CH CH1070962A patent/CH433008A/fr unknown
- 1962-09-10 LU LU42330D patent/LU42330A1/xx unknown
-
1963
- 1963-03-04 GB GB8509/63A patent/GB1035034A/en not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2705187A (en) * | 1953-07-16 | 1955-03-29 | Allied Chem & Dye Corp | Manufacture of sodium sulfide and sulfite |
| US3030209A (en) * | 1958-07-02 | 1962-04-17 | Eastman Kodak Co | High-contrast photographic silver chloride emulsions and method of processing |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3346386A (en) * | 1962-12-17 | 1967-10-10 | Agfa Ag | Polycondensation products of phosphoric acid amides with aliphatic polyethers as developer adjuvants |
| US3345174A (en) * | 1965-08-02 | 1967-10-03 | Charles R Dotson | Rapid access photographic process |
| US3617284A (en) * | 1966-09-19 | 1971-11-02 | Agfa Gevaert Nv | Development process for lith-type emulsion with n-vinyl 2-pyrrolidone polymer |
| US4329042A (en) * | 1978-01-17 | 1982-05-11 | Ciba-Geigy Ag | Method and apparatus for regenerating photographic processing solution |
| US4476213A (en) * | 1982-12-10 | 1984-10-09 | The Mead Corporation | Non-aqueous silver halide diffusion imaging system |
| US4507381A (en) * | 1982-12-10 | 1985-03-26 | The Mead Corporation | Non-aqueous silver halide diffusion imaging system |
Also Published As
| Publication number | Publication date |
|---|---|
| GB1035034A (en) | 1966-07-06 |
| NL292635A (en)) | |
| CH433008A (fr) | 1967-03-31 |
| BE631419A (en)) | |
| LU42330A1 (en)) | 1962-11-10 |
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