Patents Examined by D. R. Valentine
  • Patent number: 4334968
    Abstract: An electrolytic generator is disclosed for use in treating water in swimming pools, baths, reservoirs, sewage, etc., and in bleaching chemical pulp. The generator is of the type consisting of two sealed compartments separated by an ion-permeable membrane and having a cathode in one compartment and an anode in the other. Hydrogen is evolved from the cathode compartment and a chlorine/chlorine dioxide mixture from the anode compartment. In this generator, an electrically neutral or bipolar electrode (one not connected in the anode-cathode circuit) is positioned adjacent to the anode or between the anode and the cathode adjacent to the ion-permeable membrane in the anode compartment. This electrolytic generator is characterized by a more rapid start up and generates a mixture of chlorine and chlorine dioxide at both the anode and the neutral electrode.
    Type: Grant
    Filed: February 13, 1980
    Date of Patent: June 15, 1982
    Inventor: Charles T. Sweeney
  • Patent number: 4323438
    Abstract: In an anode of a cell for alkali metal chloride electrolysis by the amalgam method and comprising a grid-like or net-like level titanium anode surface, optionally current distributing rails, a bridge acting as a primary conducting rail and at least one copper bolt as a current supply means, the improvement wherein the copper bolt has a screw thread, the bridge having a threaded passage for receiving the screw thread and a conical passage for receiving the conical portion of the copper bolt, the copper bolt and bridge being screwed together in a force- and form-locking manner.
    Type: Grant
    Filed: March 21, 1980
    Date of Patent: April 6, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Lothar Sesterhenn, Milorad Tomic
  • Patent number: 4288310
    Abstract: Method of supporting a preformed membrane in an electrolytic cell, and apparatus therefor, which comprises casting in situ support plates about the open edges of the membrane.
    Type: Grant
    Filed: September 12, 1979
    Date of Patent: September 8, 1981
    Inventors: Allan R. Knight, Indresh Mathur
  • Patent number: 4285793
    Abstract: An intercell connector system is disclosed. The system includes two adjacent terminals attached to two adjacent cells and intercell connector selectively overlapping the adjacent ends of the terminals. The intercell connector includes a conductive first member and a second member which are held together by a fastening device which can be selectively loosened and tightened. When the fastening device is loosened, the two members are adapted to be moved out of engagement with one of the terminals thereby disconnecting the electrical circuit between the terminals.
    Type: Grant
    Filed: December 7, 1979
    Date of Patent: August 25, 1981
    Assignee: Olin Corporation
    Inventors: Steven J. Specht, Morton S. Kircher
  • Patent number: 4283259
    Abstract: A method for high resolution maskless chemical and electrochemical machining is described. Preferential etching results from exposing those regions where machining is sought to an energy beam. Such exposures can increase the ething rate in the case of electrochemical machining by a factor of 10.sup.3 to 10.sup.4. Such enhancement is sufficient to make masking unnecessary.
    Type: Grant
    Filed: May 8, 1979
    Date of Patent: August 11, 1981
    Assignee: International Business Machines Corporation
    Inventors: Robert L. Melcher, Lubomyr T. Romankiw, Robert J. von Gutfeld
  • Patent number: 4279730
    Abstract: Device for selective electrodeposition of metal flat stock, on laddered or bandoliered component strips having at least one station filled with electrolyte through which the component strips are transported lengthwise. The device includes a longitudinal guide means for the component strips-the guide means is provided with a slot shaped chamber. The chamber, at its lower side is in open contact with a plating bath filled with electrolyte on a level lower than the electrolyte level in the plating bath. The guide means has apertures for introducing pressurized gas or air. The plating bath contains tubes with holes in such a position that during operation electrolyte recirculated through a transport pump can be jetted onto the portion of the metal or component strip which extends below the slot-shaped chamber of the guide means into the electrolyte.
    Type: Grant
    Filed: December 17, 1979
    Date of Patent: July 21, 1981
    Inventor: Francis X. Noz
  • Patent number: 4278523
    Abstract: An electrolytic diaphragm or membrane cell is disclosed in which flexible clamp members are arranged to provide sealing engagement between the diaphragm or membrane and its associated support elements.
    Type: Grant
    Filed: July 20, 1979
    Date of Patent: July 14, 1981
    Assignee: Imperial Chemical Industries Limited
    Inventors: Geoffrey C. Byrd, Colin Stanier
  • Patent number: 4278522
    Abstract: An electroflotation device for treating contaminated water includes cathode electrodes which are self-cleaning with respect to lime deposits. Each anode electrode of the device is associated with a pair of cathode electrodes. During operation of the device, a negative potential is applied to only one of the two electrodes of each cathode pair, while the other electrode has either a zero potential or a weak positive potential applied thereto. The lime deposit formed on the non-negative electrode is dissolved by the action of the carbonic acid which is present in the water, through the formation of bicarbonates.
    Type: Grant
    Filed: June 18, 1979
    Date of Patent: July 14, 1981
    Assignee: BBC Brown Boveri & Company Limited
    Inventors: Gernot Jacob, Luciano Pelloni
  • Patent number: 4278525
    Abstract: An air/oxygen electrode substrate for use as a cathode in alkali metal halide electrolysis processes is formed by compressing a prefused mixture of carbon black and a hydrophobic polymer such as polytetrafluoroethylene under high pressures and at a temperature in excess of the sintering temperature of the polymer and below its decomposition temperature. Optionally, the electrode may be formed having a core comprised of a metal mesh which acts to better distribute the applied voltage and to reinforce the electrode. Further, a sheet of hydrophobic backing material such as TEFLON fabric may be incorporated into the compressed mixture to increase the hydrophobic properties of the cathode. Electrocatalysts may then be deposited on the surface of the electrode substrate to produce an oxygen electrode having a significant voltage advantage over mild steel cathodes in alkali-halide electrolysis cells.
    Type: Grant
    Filed: April 24, 1978
    Date of Patent: July 14, 1981
    Assignee: Diamond Shamrock Corporation
    Inventor: Lawrence J. Gestaut
  • Patent number: 4278521
    Abstract: An electrochemical cell is disclosed for eliminating and/or recovering dissolved metals from waste liquors or winning dissolved metals from waste solutions having a low concentration of such metals. The cell has a three dimensional electrode with a geometrical bed depth that is increased from the electrolyte inlet to outlet so that the bed depth increases along the flow direction corresponding to the concentration decrease within the cell. Thus, the geometrical bed depth is essentially equal to the effective bed depth at each point within the electrode where the electrochemical conversion takes place.
    Type: Grant
    Filed: January 15, 1980
    Date of Patent: July 14, 1981
    Assignee: DECHEMA
    Inventor: Gerhard Kreysa
  • Patent number: 4277317
    Abstract: The present invention is directed to a method of minimizing shunt currents in electrochemical devices which have a plurality of cells connected, at least in part, in series and which have a common electrolyte which is fed to at least two of the cells as a shared electrolyte from a common manifold via individual inlet channels, whereby an electrical electrolytic conductive bypass path is created around such cells and through said shared electrolyte, resulting in undesirable shunt currents. This method involves providing electrolyte tunnels which connect the individual inlet channels and applying a protective current through said electrolyte tunnels and thus through said shared electrolyte, the protective current being of a magnitude which effectively at least reduces said shunt currents. Thus, a single protective current may be applied such that shunt currents are minimized, and preferably are totally eliminated.
    Type: Grant
    Filed: November 26, 1979
    Date of Patent: July 7, 1981
    Assignee: Exxon Research & Engineering Co.
    Inventors: Patrick G. Grimes, Markus Zahn
  • Patent number: 4274939
    Abstract: An electrode package is disclosed which comprises a substantially flat elrode (32) surrounded by two substantially flat inner frames (1) which are surrounded by a substantially flat outer frame (20) with holes (21, 22) for supply of electrolyte to and holes (23, 24) for discharge of electrolyte from the electrode. Each of the inner frames is provided with a grid (13) that improves the electrolyte flow and serves as a support for a membrane when used in membrane cells, and furthermore with flow-distributing projections and possibly barriers, making it possible to achieve varying flow patterns for the electrolyte with the same basic construction. The outer frame is preferably provided with ridges, going all the way round, for the simple fitting and sealing of a membrane against it. The electrode package will, thus, be particularly suitable for use in membrane cells in electrolyzers of the filter-press type, said use also being described herein.
    Type: Grant
    Filed: April 10, 1980
    Date of Patent: June 23, 1981
    Assignee: Svenska Utvecklingsaktiebolaget (SU) Swedish National Development Co.
    Inventor: Ake B. Bjaareklint
  • Patent number: 4274938
    Abstract: An apparatus for producing hydrogen and oxygen or oxides wherein electrolysis of an aqueous system is carried out using, in the cathode compartment of the electrolysis cell, a hydride-forming liquid metal, the resulting hydride being thermally decomposed to produce the hydrogen.
    Type: Grant
    Filed: November 28, 1979
    Date of Patent: June 23, 1981
    Assignee: Kernforschungsanlage Julich GmbH
    Inventors: Rudolf Schulten, Friedrich Behr, Helmut Wenzl
  • Patent number: 4273640
    Abstract: An apparatus for use in extracting primary zinc metal from ore concentrates is described. The apparatus includes first and second electrolytic cells, the first cell receiving an acid zinc sulfate solution derived from an ore concentrate, and having an anode which is insoluble in said solution, and the second cell containing an alkaline electrolyte and having a cathode which is insoluble in said electrolyte. A common electrode is also provided which is insoluble both in the acid zinc sulfate solution and in the alkaline electrolyte. The common electrode can be transferred between the first cell, in which it acts as a cathode, and the second cell, in which it acts as an anode. The zinc sulfate solution is subjected to electrolysis in the first cell with the common electrode acting as a cathode, thereby causing primary zinc metal to be deposited as a coating on the common electrode.
    Type: Grant
    Filed: November 21, 1979
    Date of Patent: June 16, 1981
    Inventor: Richard H. C. LeB. Ross
  • Patent number: 4272351
    Abstract: A process and apparatus for electrolytic etching of aluminum or its alloy is disclosed wherein an electric current is passed between an anode and a cathode which are spaced opposed in an electrolytic bath with a workpiece removably supported on an insulating frame so that the side of the workpiece to be etched faces the cathode, the insulating frame being disposed between the anode and the cathode and having at least one opening formed therein.
    Type: Grant
    Filed: January 25, 1980
    Date of Patent: June 9, 1981
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Yasutoyo Kotani, Kazuo Sawada, Shuzo Nagai, Takao Ogino, Seiji Watabe
  • Patent number: 4270995
    Abstract: An electrochemical cell comprises a housing (1,2) divided by a perforated generally horizontal plate (3) into an upper chamber (4) and a lower chamber (5). Bipolar electrodes (19, 21) are disposed in the upper chamber (4) above perforations (23) in the plate (3), between electrolyte inlet and outlet weirs (11, 13) for flowing electrolyte over the plate (3). The lower chamber (5) is a gas-supply chamber for passing a gas, e.g. propylene, up through the perforations (23), so as to bubble the gas through electrolyte (e.g. NaBr solution) on the plate (3) and into the upper gas-collection chamber (4). A reactor may be formed by stacking several cells with their electrolyte flows in cascade. The cell is particularly suitable for electro-organic syntheses involving a gaseous reactant.
    Type: Grant
    Filed: July 13, 1979
    Date of Patent: June 2, 1981
    Assignee: Diamond Shamrock Corporation
    Inventors: Francis Goodridge, Raymond E. Plimley
  • Patent number: 4271004
    Abstract: Disclosed is an electrolytic cell having an electrolyte tank, planar first electrodes substantially parallel to and spaced from each other and electrically in parallel with each other in the tank, and a series of hollow second electrodes of opposite polarity to and interleaved between the planar first electrodes. The hollow second electrodes are substantially parallel to and spaced from each other and electrically in parallel with each other. An ion permeable separator is on the electrically active external surfaces of the hollow second electrodes between the planar first electrodes and the hollow second electrodes. Reactant feed and gaseous product recovery, as well as bus bars, are above the electrolyte tank thereby allowing ease of assembly and disassembly and flexibility in the number of units to be utilized.
    Type: Grant
    Filed: July 11, 1979
    Date of Patent: June 2, 1981
    Assignee: PPG Industries, Inc.
    Inventors: Hugh Cunningham, Carl W. Raetzsch
  • Patent number: 4269673
    Abstract: The invention involves a cell which may be used for producing molten aluminum by electrolysis of aluminum oxide in a molten bath. The cell includes a cathode and an anode, a bar and a hanger. The bar is connected at an upper end to the hanger and at a lower end to the anode. Flexible means is provided for supplying electrical current through the bar to the anode. A jack means raises and lowers the hanger and thus the anode. Included in the invention, the hanger is mounted at at least two separated points, one higher than the other, in encompassing, sliding relationship, on a single, upright, circular cross-sectioned post passing through the hanger. By this technique, the hanger is constrained to move up and down, without relation about horizontal axes.
    Type: Grant
    Filed: January 28, 1980
    Date of Patent: May 26, 1981
    Assignee: Aluminum Company of America
    Inventor: John F. Clark
  • Patent number: 4269688
    Abstract: Disclosed is a solid polymer electrolyte bipolar electrolyzer having an anode facing surface of the bipolar electrolyzer of enhanced resistance to crevice corrosion and hydrogen uptake.
    Type: Grant
    Filed: November 1, 1979
    Date of Patent: May 26, 1981
    Assignee: PPG Industries, Inc.
    Inventor: Donald D. DuBois
  • Patent number: 4269690
    Abstract: An improved apparatus is disclosed for reclaiming dissolved metal from a liquid, in which a pail or similar container (10) is provided with at least one pair of nested, concentric cylindrical metal cathodes (16, 34) with an anode rod (40) located concentric with the central cathode (34) and a plurality of anode rods (38) located in the annulus between the cathodes (16, 34). Liquid containing metal to be reclaimed is introduced by gravity feed at a location (20) near the bottom of the container (10) so that when a voltage is applied between the cathodes (16, 34) and anodes (38, 40), the dissolved metal plates out on the cathodes (16, 34) and essentially metal-free liquid may be drawn off at a location (22) near the upper portion of the container.
    Type: Grant
    Filed: January 28, 1980
    Date of Patent: May 26, 1981
    Assignee: Nancy Swartz Hammond
    Inventor: James M. Graham, III