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| Number | Title | Issue Date |
| 6984300 | Method for recovering useful components from electrolytic phosphate chemical treatment bath The present invention provides means for recovering and reusing useful component ions in electrolytic phosphate chemical treatment bath without subjecting them to waste water treatment. In the present invention, a phosphate chemical treatment bath which contains pho... | 01/10/2006 |
| 6878258 | Apparatus and method for removing contaminants from semiconductor copper electroplating baths The present invention generally provides an apparatus and method for removing contaminants from a plating solution. The apparatus generally includes a plating cell having an electrolyte inlet and an electrolyte drain, an electrolyte storage unit in fluid communicati... | 04/12/2005 |
| 6120673 | Method and device for regenerating tin-plating solutions The invention relates to a method and a device for regenerating exhausted tin-plating solutions which contain tin and copper ions, free complexing agent and complexing agent bound to the copper ions, as well as expended and unexpended reducing agent. By m... | 09/19/2000 |
| 6102589 | Processing method of black-and-white photographic materials A method of processing an exposed black-and-white silver halide photographic film material, the method having the steps of developing in a developer solution, fixing in a fixer solution, replenishing of fixer and developer solution, rinsing in a washing s... | 08/15/2000 |
| 5766438 | Electrolyzer and a method of operating the same In an electrolyzer provided according to this invention, the polarity of electrodes is periodically inverted at very short intervals. This has the effect of allowing gases to be generated uniformly all over the surface of each electrode in the form of ext... | 06/16/1998 |
| 5536385 | Production and purification of contaminated effluent streams containing ammonium sulfate and ammonia The present invention, in certain embodiments, teaches a process for treating ammonia or ammonium-sulfate-containing waste effluent from an acrylonitrile, caprolactam or acetonitrile manufacturing facility. In one such process the effluent is fed to a dee... | 07/16/1996 |
| 5523201 | Method for desalting silver halide emulsion and silver halide emulsion prepared thereby A desalting method of a silver halide emulsion is disclosed, comprising removing soluble salts from the silver halide emulsion by electrodialysis, wherein said electrodialysis is carried out at a pH within a range of &#b1;0.5 of an isoelectric point of a ... | 06/04/1996 |
| 5472585 | Regeneration of spent electroless copper plating solution Disclosed is a method for removal of contaminants and replenishment of an electroless copper plating solution in order to allow reuse of the solution. Copper oxide is dissolved in the spent solution and this is followed by an electrodialysis which removes... | 12/05/1995 |
| 5431788 | Chloride assisted hydrometallurgical copper extraction A process for the extraction of copper from a sulphide copper ore or concentrate comprises subjecting the ore or concentrate to a first leaching at an elevated temperature and pressure in the presence of oxygen and a lixiviant which comprises an acidic so... | 07/11/1995 |
| 5353085 | Automatic processor for processing silver halide photographic light-sensitive material An automatic processing system for photographic light-sensitive material, which includes an automatic processor having a processing tank containing a processing solution with which the material is processed, a replenisher of a concentrated processing repl... | 10/04/1994 |
| 4971672 | Removal of acid from cathodic electrocoating baths by electrodialysis Acid is removed from cathodic electrocoating baths by a process in which electroconductive sub-strates are coated with cationic resins present in the form of aqueous dispersions, at least a portion of the coating bath being subjected to an ultrafiltration... | 11/20/1990 |
| 4883573 | Removal of acid from cathodic electrocoating baths by electrodialysis Acid is removed from cathodic electrocoating baths by a process in which electroconductive substrates are coated with cationic resins present in the form of aqueous dispersions, at least a portion of the coating bath being subjected to an ultrafiltration ... | 11/28/1989 |
| 4859575 | Method for processing of silver halide color photographic material with dialysis treatment Disclosed is a method for processing of a photographic material which comprises carrying out stabilizing processing of a photographic material with a stabilizing solution substantially without washing with water subsequent to the processing with a process... | 08/22/1989 |
| 4820391 | Exhaust gas clean up process A method of cleaning an exhaust gas containing particulates, SO2 and NOx includes prescrubbing with water to remove HCl and most of the particulates, scrubbing with an aqueous absorbent containing a metal chelate and dissolved sulfit... | 04/11/1989 |
| 4802966 | Method for treating liquid used for absorbing gaseous sulfur dioxide in the process for desulfurization of combustion exhaust gas Disclosed herein is a method for treating a liquid used for absorbing gaseous sulfur dioxide in the wet process for desulfurization of a combustion exhaust gas of the gypsum-by-producing type, which method comprises the steps of, after subjecting a liquid... | 02/07/1989 |
| 4740281 | Recovery of acids from materials comprising acid and salt We have discovered an improved, energy efficient method for recovering and regenerating acid from a solution comprising acid and salt. The process comprises of the steps of supplying a solution comprising salt and a first concentration of acid to a first ... | 04/26/1988 |
| 4715939 | Method for removal of monovalent ions from ZnSO4 electrolyte by electrodialysis Monovalent ions, especially chloride and fluoride, but also thallium, sodium and potassium are efficiently removed from ZnSO4 electrolyte by electrodialysis. Monovalent anions are removed using alternating monovalent anion permselective membran... | 12/29/1987 |
| 4645625 | Decontamination of a radioactive waste liquid by electrodialysis This invention relates to apparatus and processes for the removal and recovery of concentrated acid such as HNO3 and radioactive cations such as cesium (Cs+) from a radioactive acidic waste stream resulting in the recovery of a decon... | 02/24/1987 |
| 4324629 | Process for regenerating chemical copper plating solution During recyclic use of a chemical copper plating solution, counter anions to copper ions, anions formed by oxidation of a reducing agent, and carbon dioxide by absorption of carbon dioxide from air, which all have an inhibiting effect upon the plating, an... | 04/13/1982 |
| 4313808 | Electrodialyzer and method of regenerating waste photographic processing solution A method of regenerating a waste photographic processing solution (e.g., a waste developing solution or a waste bleaching-fixing solution) by electrodialysis utilizing ion exchange membranes, which uses an electrodialyzer characterized by the arrangement ... | 02/02/1982 |
| 4311574 | Regeneration of photographic processing solutions A method for regenerating a photographic processing solution is disclosed, comprising bringing the photographic processing solution into contact with a particular styrenedivinylbenzene copolymer, and then subjecting the photographic processing solution to... | 01/19/1982 |
| 4256559 | Method and apparatus for regenerating spent photographic bleach-fixer solution An apparatus for regenerating a spent photograhic bleach-fixer solution, comprising (a) an electrodialysis cell including a cathode, an anode and alternating anion exchange membranes and cation exchange membranes arranged therebetween to define a cathode ... | 03/17/1981 |
| 4207157 | Method for controlling halogen ion concentration in a photographic processing solution The concentration of halogen ions in a photographic developer is controlled at an almost constant value by determining the concentration of halogen ions in the developer by detecting the change in electric potential caused by the addition of silver ions t... | 06/10/1980 |
| 4204930 | Method and apparatus for regenerating spent photographic bleach-fixer solution A method for regenerating a spent bleach-fixer solution by electrodialysis using an electrodialysis cell comprising a cathode, an anode and alternating anion exchange membranes and cation exchange membranes arranged therebetween to define a cathode compar... | 05/27/1980 |
| 4145271 | Method for regenerating oxidized photographic developers A method for regenerating an oxidized photographic developer, which comprises bringing the oxidized photographic developer into contact with an adsorbent material which has affinity for the oxidation product of the developing agent or its derivatives and ... | 03/20/1979 |
| 3974258 | Process for purifying a sulfur dioxide containing gas A sulfur dioxide containing gas is purified by successive contact with an ammonia solution and then a dilute ammonium sulfite solution; the latter solution is regenerated by electrodialysis while the ammonia solution, after SO2 absorption, is v... | 08/10/1976 |
