| Patent Number |
Title Of Patent |
Date Issued |
| RE34191 |
Process for electroplating metals |
March 9, 1993 |
| A process for electroplating metals in an electroplating cell in which the anode current efficiency of the cell is greater than the cathode current efficiency. Buildup of excess metal in the cell is counteracted by circulating the plating solution through an electrowinning cell and p |
| 7045067 |
Method and apparatus for increasing filter contaminant loading capacity |
May 16, 2006 |
| The filter contaminant loading capacity of a depth granular media filter is increased by imposing a so-called "back-slip" on the filter bed. At intervals between normal backwashing, a volume of liquid is passed upwardly through the media bed under flow conditions selected to displace |
| 5942084 |
Process for the separation of sulphides from pulping liquors using amphoteric resins |
August 24, 1999 |
| A process using an amphoteric ion-exchange resin, also known as a "snake-cage polyelectrolyte" resin separates kraft white liquor into sulphide-rich and caustic-rich components. The sulphide-rich component can be used in the initial stage of pulping, pretreatment of wood chips prior |
| 5922171 |
Method and apparatus for removing sodium chloride from pulping chemicals using an amphoteric ion |
July 13, 1999 |
| Sodium chloride is removed from pulping chemicals used in a Kraft pulping process by the use of a snake-cage polyelectrolyte ion exchange resin, coupled with removal of sulfide prior to treatment, or treatment of chemicals which are already low in sulfide. In one aspect of the invent |
| 5792441 |
Fixed-resin bed technologies for the treatment of the chlorine dioxide generator effluent and fe |
August 11, 1998 |
| A process employing a fixed-resin bed Acid Retardation Unit (ARU) to separate spent acid from chlorine dioxide generators into a de-acidified sodium sulfate component and a purified sulfuric acid component. The de-acidified sodium sulfate produced is returned to the chemical recovery |
| 5547579 |
Process and apparatus for purification of contaminated acids |
August 20, 1996 |
| Acids contaminated with multi-valent metal salts are purified by a process which involves treatment in an acid sorption unit (ASU) and a nanofiltration unit (NFU). The feed solution can first be delivered to the ASU, which produces two solutions, one high in acid concentration and the |
| 5500098 |
Process for regeneration of volatile acids |
March 19, 1996 |
| Volatile acids containing metal salt impurities, such as metal pickling solutions-are regenerated by a process in which the acid is subjected to sulfuric acid distillation. Resulting volatile acid vapor is condensed and recycled to the pickle tank, while the residual acid mixture is trea |
| 5173170 |
Process for electroplating metals |
December 22, 1992 |
| An electroplating cell having soluble and insoluble anodes is provided with a primary power supply having a positive terminal connected to the soluble anodes and a negative terminal connected to a cathode including workpieces to be plated. An auxiliary power supply has a positive termina |
| 5162079 |
Process and apparatus for control of electroplating bath composition |
November 10, 1992 |
| A process and apparatus for electroplating metals in which the metal salt concentration within the electroplating bath is reduced by providing an insoluble anode assembly in the bath. The insoluble anode assembly includes an enclosure which defines a compartment around an insoluble a |
| 4906340 |
Process for electroplating metals |
March 6, 1990 |
| A process for electroplating metals in an electroplating cell in which the anode current efficiency of the cell is greater than the cathode current efficiency. Buildup of excess metal in the cell is counteracted by circulating the plating solution through an electrowinning cell and p |
| 4832812 |
Apparatus for electroplating metals |
May 23, 1989 |
| An apparatus for electroplating metals in an electroplating bath having an anode and a cathode. The cathode is formed by a workpiece to be plated and the anode includes soluble material in the form of the metal to be plated and insoluble material in a proportion selected so that the anod |
| 4778572 |
Process for electroplating metals |
October 18, 1988 |
| A process for electroplating metals in an electroplating bath having an anode and a cathode. The cathode is formed by a workpiece to be plated and the anode includes soluble material in the form of the metal to be plated and insoluble material in a proportion selected so that the anode |
| 4673507 |
Fluid treatment process and apparatus |
June 16, 1987 |
| An apparatus and process for treating a fluid by passing the fluid through a bed of particulate material such as an ion exchange resin capable of taking up from the fluid a component to be removed therefrom. Substantially uniform fluid flow distribution across the cross-sectional are |
| 4666683 |
Process for removal of copper from solutions of chelating agent and copper |
May 19, 1987 |
| A process is provided for removing copper from a solution containing same with a chelating agent. The process is advantageously practiced on aqueous effluents from electroless plating systems to remove copper from an aminopolycarboxylic acid chelating agent such as ethylene diaminete |
