Patents Assigned to Eltech Systems Corporation
  • Patent number: 7884044
    Abstract: The present invention relates to an electrocatalytic coating and an electrode having the coating thereon, wherein the coating is a mixed metal oxide coating, preferably platinum group metal oxides with or without valve metal oxides, and containing a transition metal component such as palladium, rhodium or cobalt. The electrocatalytic coating can be used especially as an anode component of an electrolysis cell for the electrolysis of a halogen-containing solution wherein the palladium component reduces the operating potential of the anode and eliminates the necessity of a “break-in” period to obtain the lowest anode potential.
    Type: Grant
    Filed: September 1, 2004
    Date of Patent: February 8, 2011
    Assignee: Eltech Systems Corporation
    Inventors: Dino F. DiFranco, Kenneth L. Hardee
  • Publication number: 20100044219
    Abstract: The present invention relates to an electrocatalytic coating and an electrode having the coating thereon, wherein the coating is a mixed metal oxide coating, preferably ruthenium, titanium and tin or antimony oxides. The coating uses water as a solvent that provides for a smoother surface than alcohol based solvents. The electrocatalytic coating can be used especially as an anode component of an electrolysis cell and in particular a cell for the electrolysis of aqueous chlor-alkali solutions.
    Type: Application
    Filed: October 29, 2009
    Publication date: February 25, 2010
    Applicant: Eltech Systems Corporation
    Inventors: Richard C. Carlson, Kenneth L. Hardee, Dino F. DiFranco, Michael S. Moats
  • Patent number: 7258778
    Abstract: The present invention relates to an electrocatalytic coating and an electrode having the coating thereon, wherein the coating is a mixed metal oxide coating, preferably platinum group metal oxides, with or without low levels of valve metal oxides. The electrocatalytic coating can be used especially as an anode component of an electrolysis cell and in particular a cell for the electrolysis of aqueous chlor-alkali solutions.
    Type: Grant
    Filed: March 24, 2003
    Date of Patent: August 21, 2007
    Assignee: Eltech Systems Corporation
    Inventor: Kenneth L. Hardee
  • Patent number: 7247229
    Abstract: A process for electroplating of metal utilizing a valve metal electrode substrate containing multiple coating layers is disclosed. A top coating layer of a valve metal oxide is applied over a first coating layer of an electrochemically active coating. The electrode may find use in an electroplating system containing organic substituents in which the consumption of the organic substituent is significantly decreased or in systems where it is desirable to suppress the oxidation of a species in an electrochemical cell.
    Type: Grant
    Filed: October 18, 2002
    Date of Patent: July 24, 2007
    Assignee: ELTECH Systems Corporation
    Inventor: Kenneth I Hardee
  • Patent number: 6998029
    Abstract: Various systems and methods for protecting electrowinning anodes having electrocatalytically active coatings in a bank of electrolytic cells from being damaged by reverse currents. In the first embodiment, one or more auxiliary power sources are provided that, when triggered by one or more predetermined conditions being met, keep the bank of electrolytic cells in an electrical state that is relatively harmless to the anodes having electrocatalytically active coatings. In a second embodiment, the invention is directed to a method of maintaining the polarization of anodes in an electrowinning cell positive of the cathodes (i.e. in a potential region where the anode coating is not susceptible to significant damage). In a final embodiment, the invention is directed to various methods for the installation of replacement anodes and maintenance of electrowinning cells.
    Type: Grant
    Filed: August 14, 2002
    Date of Patent: February 14, 2006
    Assignee: Eltech Systems Corporation
    Inventors: Kenneth L. Hardee, Michael S. Moats, Carl W. Brown, Jr., Robert L. Wilhelm, Edward M. Halko, Zane A. Wade
  • Patent number: 6802948
    Abstract: There is disclosed a method for cooper electrowinning and a modified lead electrode for use in such method. The modified electrode is suitable for use as an oxygen anode in low current density, oxygen-evolving applications.
    Type: Grant
    Filed: January 30, 2002
    Date of Patent: October 12, 2004
    Assignee: Eltech Systems Corporation
    Inventors: Kenneth L. Hardee, Lynne M. Ernes, Carl W. Brown, Jr.
  • Patent number: 6582571
    Abstract: An electrolytic cell comprising a walled enclosure including a cathode sidewall has busbar structure external to the cell. The busbar structure can include a gird bar releasably secured at the sidewall. It also may include a foraminous interface member between the gird bar and the sidewall, as well as have a small cathode busbar member on the sidewall. The small busbar member is typically located above and adjacent to the gird bar. Particularly when the gird bar and foraminous interface member are present, there can be internal support members for the cathodes directly secured to the inside face of the cathode sidewall. Furthermore, intercell connection may be handled directly to the outside face of the cathode sidewall. The overall structure can provide reduced potential for sidewall stress corrosion cracking, reduced cathode manufacturing cost, and accommodation of stress relief for the cathode weldment.
    Type: Grant
    Filed: May 11, 2001
    Date of Patent: June 24, 2003
    Assignee: Eltech Systems Corporation
    Inventors: Richard L. Romine, Thomas F. Florkiewicz, John J. Jahn, Gerald R. Pohto
  • Patent number: 6527939
    Abstract: A method of producing copper foil, and more particularly, in an electrochemical cell containing organic substituents, is provided herein. The metal may be deposited on an electrode that comprises an electrode base having at least one undercoating layer of an active coating and at least one topcoating layer of no significant activity. The copper electrodeposition cell can operate without an adverse affect on electrode potential.
    Type: Grant
    Filed: June 22, 2000
    Date of Patent: March 4, 2003
    Assignee: Eltech Systems Corporation
    Inventor: Kenneth L Hardee
  • Patent number: 6395153
    Abstract: The present invention pertains to electrolytic diaphragm cells, particularly for the electrolysis of brine to produce chlorine and caustic. The innovation resides generally in the discovery that electrolytic cell operation can be desirably enhanced by compressing the diaphragm between anode and cathode. This compression of the diaphragm reduces the diaphragm thickness from an original thickness, e.g., from an original thickness of a diaphragm freshly deposited on a cathode. The reduced thickness of the diaphragm provides for cell operation that is less than zero gap operation. By maintaining the diaphragm under compression and in a reduced thickness, the cell operates with a narrower interelectrode gap and consequently at a desirably reduced cell voltage.
    Type: Grant
    Filed: September 10, 1999
    Date of Patent: May 28, 2002
    Assignee: Eltech Systems Corporation
    Inventors: Rudolf C. Matousek, Mark L. Arnold, Barry L. Martin, Eric J. Rudd, Lynne M. Ernes, Zoilo J. Colon, Gary F. Wyman, Joseph J. Chance
  • Patent number: 6368489
    Abstract: There is disclosed a method for copper electrowinning and a modified lead electrode for use in such method. The modified electrode is suitable for use as an oxygen anode in low current density, oxygen-evolving applications.
    Type: Grant
    Filed: August 25, 2000
    Date of Patent: April 9, 2002
    Assignee: Eltech Systems Corporation
    Inventors: Kenneth L. Hardee, Lynne M. Ernes, Carl W. Brown, Jr.
  • Patent number: 6352622
    Abstract: A compound electrode incorporating a lead substrate utilizes the lead as a support structure. This support structure provides a surface that engages a valve metal expanded metal mesh. The mesh member has a front and back surface with the back surface facing the lead support structure. At least the front surface of the mesh member is an active surface. Securing of the mesh member to the lead support structure in electrical connection permits the lead support structure to serve as a current distributor for the mesh member. The mesh member may engage the surface of the lead support structure by pressing or rolling the mesh onto the lead. Other engagement means can include the use of fasteners, or welding and the like. The resulting structure can be particularly useful as an electrode assembly for use in an electrolytic cell that serves for the electrowinning of a metal.
    Type: Grant
    Filed: September 13, 2000
    Date of Patent: March 5, 2002
    Assignee: Eltech Systems Corporation
    Inventors: Carl W. Brown, Jeries I. Bishara, Lynne M. Ernes, Andy W. Getsy, Kenneth L. Hardee, Barry L. Martin, Gerald R. Pohto, Thomas J. Schue, Thomas R. Turk
  • Publication number: 20020005362
    Abstract: A bipolar electrolytic cell can include, as a manifold, a spiral manifold assembly. This spiral manifold assembly will comprise a first outer assembly member, a second outer assembly member and a center assembly member. The overall structure can provide reduced loss of metal or gas and minimal loss of electrical current during an electrolytic process.
    Type: Application
    Filed: June 7, 2001
    Publication date: January 17, 2002
    Applicant: ELTECH Systems Corporation
    Inventors: Robert L. Wilhelm, William A. Nutter
  • Patent number: 6328860
    Abstract: An electrolytic cell comprising a walled enclosure including a cathode sidewall has busbar structure external to the cell. The busbar structure can include a gird bar releasably secured at the sidewall. It also may include a small cathode busbar member on the sidewall. The small busbar member is typically located above and adjacent to the gird bar. there can be internal support members for the cathodes directly secured to the inside face of the cathode sidewall. Furthermore, intercell connection may be handled directly to the outside face of the cathode sidewall. The overall structure can provide reduced potential for sidewall stress corrosion cracking, reduced cathode manufacturing cost, and accommodation of stress relief for the cathode weldment.
    Type: Grant
    Filed: July 23, 1999
    Date of Patent: December 11, 2001
    Assignee: Eltech Systems Corporation
    Inventors: Richard L. Romine, Thomas F. Florkiewicz, John J. Jahn, Gerald R. Pohto
  • Patent number: 6309523
    Abstract: An electrode is disclosed having a coating on part of the electrode, e.g., a front face, comprising the oxides of tin, antimony, at least one platinum group metal and at least one valve metal. Another part of the electrode, such as a back face, has a coating comprising the oxides of at least one valve metal and at least one platinum group metal. The electrode can be generally plate-shaped and most desirably has at least one chamfered corner. The electrode is particularly useful in a cell wherein brine electrolyte is electrolyzed to prepare a disinfectant solution containing hypochlorite. The disinfectant solution can be especially serviceable, such as in maritime application, for treating water, e.g., freshwater as represented by desalinated water.
    Type: Grant
    Filed: October 28, 1999
    Date of Patent: October 30, 2001
    Assignee: Eltech Systems Corporation
    Inventors: Albert R. Prasnikar, Richard C. Carlson, Richard J. Coin, Lynne M. Ernes, Catherine M. Lezan
  • Patent number: 6254743
    Abstract: This invention relates generally to an electrically conductive valve metal mesh of extreme void fraction. More particularly the invention relates in a most important aspect to an application thereof for an electrode structure in such a way as to prevent the corrosion of steel, including reinforcing steel in concrete, by cathodic protection.
    Type: Grant
    Filed: December 24, 1990
    Date of Patent: July 3, 2001
    Assignee: Eltech Systems Corporation
    Inventors: John E. Bennett, Gerald R. Pohto, Thomas A. Mitchell
  • Patent number: 6139705
    Abstract: A compound electrode incorporating a lead substrate utilizes the lead as a support structure. This support structure provides a surface that engages a mesh member, e.g., a valve metal expanded metal mesh. The mesh member has a front and back surface with the back surface facing the lead support structure. At least the front surface of the mesh member is an active surface. Securing of the mesh member to the lead support structure in electrical connection permits the lead support structure to serve as a current distributor for the mesh member. The mesh member may engage the surface of the lead support structure as by pressing or rolling the mesh onto the lead. Other engagement means can include the use of fasteners, or welding and the like. The resulting structure can be particularly useful as an electrode assembly for use in an electrolytic cell that serves for the electrowinning of a metal.
    Type: Grant
    Filed: March 22, 1999
    Date of Patent: October 31, 2000
    Assignee: Eltech Systems Corporation
    Inventors: Carl W. Brown, Jr., Jeries I. Bishara, Lynne M. Ernes, Andy W. Getsy, Kenneth L. Hardee, Barry L. Martin, Gerald R. Pohto, Thomas J. Schue, Thomas R. Turk
  • Patent number: 6071570
    Abstract: A method of preparing electrodes is now described, which electrodes have enhanced adhesion of subsequently applied coatings combined with excellent coating service life. In the method, a substrate metal, such as a valve metal as represented by titanium, is provided with a highly desirable rough surface characteristic for subsequent coating application. This can be achieved by various operations including etching to ensure a roughened surface morphology. In subsequent operations, a barrier layer is provided on the surface of enhanced morphology. This may be achieved by operations including heating, as well as including thermal decomposition of a layer precursor. Subsequent coatings provide enhanced lifetime even in the most rugged commercial environments.
    Type: Grant
    Filed: August 27, 1997
    Date of Patent: June 6, 2000
    Assignee: Eltech Systems Corporation
    Inventors: Kenneth L. Hardee, Lynne M. Ernes, Richard C. Carlson
  • Patent number: 5989396
    Abstract: An electrode is disclosed having a coating on part of the electrode, e.g., a front face, comprising the oxides of tin, antimony, at least one platinum group metal and at least one valve metal. Another part of the electrode, such as a back face, has a coating comprising the oxides of at least one valve metal and at least one platinum group metal. The electrode can be generally plate-shaped and most desirably has at least one chamfered corner. The electrode is particularly useful in a cell wherein brine electrolyte is electrolyzed to prepare a disinfectant solution containing hypochlorite. The disinfectant solution can be especially serviceable, such as in maritime application, for treating water, e.g., freshwater as represented by desalinated water.
    Type: Grant
    Filed: April 1, 1998
    Date of Patent: November 23, 1999
    Assignee: ELTECH Systems Corporation
    Inventors: Albert R. Prasnikar, Richard C. Carlson, Richard J. Coin, Lynne M. Ernes, Thomas A. Mitchell, Catherine M. Lezan
  • Patent number: 5879817
    Abstract: A metal coating of typically a valve metal, especially a titanium metal coating, is applied by thermal spraying to the surface of concrete, most particularly steel-reinforced concrete. The metal such as titanium may be sprayed by any one of several thermal spraying techniques including flame spray, electric-arc spray, plasma spray, high-velocity oxyfuel spray, or detonation gun spray. The metal coating should be tightly adhered to the concrete and desirably will have a porosity to facilitate extensive coating of the metal itself, as well as facilitate any activation that may be needed for the metal. Such activation can be in the form of an electrochemically active material which allows the coating to function in electrochemically active form. One coating option is to apply a solution onto the spray-applied metal, then polarize the metal anodically to effect deposition of active material on the metal.
    Type: Grant
    Filed: January 19, 1995
    Date of Patent: March 9, 1999
    Assignee: Eltech Systems Corporation
    Inventors: Carl W. Brown, Jr., John E. Bennett, John J. Bartholomew, Barry L. Martin, Thomas J. Schue
  • Patent number: 5849164
    Abstract: A cell, particularly a membrane cell, that will generally be oriented in an at least substantially vertical positioning, is provided with an array of blade electrodes. The blade electrodes are Delta shape in cross-section, having a flat back face and forwardly sloping sides meeting at a forward edge. Such electrodes can be secured to a current distributor bar, typically on a flat front face of the bar. The forward edge of an electrode blade may be placed opposite a counter electrode of the same or different structure, with a membrane separator usually interposed therebetween. Electrical connection can be made to the electrode blades from the distributor bar, and to the distributor bar through boss electrical connectors. Baffles, which may also be secured to the distributor bar, help establish a front chamber, containing the electrode blades, in front of the baffles, and a back chamber behind the baffles. Electrolyte circulates through the front chamber and recirculates through the back chamber.
    Type: Grant
    Filed: June 2, 1997
    Date of Patent: December 15, 1998
    Assignee: Eltech Systems Corporation
    Inventor: Gerald R. Pohto