Patents by Inventor David Leychkis

David Leychkis has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Flux and process for hot dip galvanization
    Patent number: 7811389
    Abstract: A flux for use in a hot dip galvanization process has an acidic component so that the flux has a pH of about 1.5 or less. The flux also includes an alkali metal chloride and a nonionic surfactant containing polyoxyethylenated straight-chain alcohols with a hydrophile-lipophile balance (HLB) of less than 11. Depending on the particular application, the flux also includes other components, such as ferric chloride, an inhibitor containing an amino derivative and bismuth oxide.
    Type: Grant
    Filed: December 18, 2006
    Date of Patent: October 12, 2010
    Assignee: Teck Metals Ltd.
    Inventors: David Leychkis, John Zervoudis
  • Flux and process for hot dip galvanization
    Publication number: 20070137731
    Abstract: A flux for use in a hot dip galvanization process has an acidic component so that the flux has a pH of about 1.5 or less. The flux also includes an alkali metal chloride and a nonionic surfactant containing polyoxyethylenated straight-chain alcohols with a hydrophile-lipophile balance (HLB) of less than 11. Depending on the particular application, the flux also includes other components, such as ferric chloride, an inhibitor containing an amino derivative and bismuth oxide.
    Type: Application
    Filed: December 18, 2006
    Publication date: June 21, 2007
    Inventors: David Leychkis, John Zervoudis
  • Preparation of steel surfaces for single-dip aluminium-rich zinc galvanising
    Patent number: 7160581
    Abstract: A process is disclosed for the preparation of a steel surface for single-dip aluminium-rich zinc galvanizing. The process steps comprise: cleaning the surface so as to obtain less than 0.6 ?g/cm2 residual dirt; pickling the surface; applying a protective layer to the surface by immersion in a flux solution comprising bismuth. This invention also relates to a continuous steel product coated with a layer of metallic bismuth.
    Type: Grant
    Filed: November 20, 2002
    Date of Patent: January 9, 2007
    Assignee: Umicore
    Inventors: Michael Gilles, David Leychkis, Yume Grot, Roger Pankert
  • Preparation of steel surfaces for single-dip aluminium-rich zinc galvanising
    Publication number: 20050069653
    Abstract: A process is disclosed for the preparation of a steel surface for single-dip aluminium-rich zinc galvanising. The process steps comprise: cleaning the surface so as to obtain less than 0.6 ?g/cm2 residual dirt; pickling the surface; applying a protective layer to the surface by immersion in a flux solution comprising bismuth. This invention also relates to a continuous steel product coated with a layer of metallic bismuth.
    Type: Application
    Filed: November 20, 2002
    Publication date: March 31, 2005
    Inventors: Michael Gilles, David Leychkis, Yume Grot, Roger Pankert
  • Fluxes for lead-free galvanizing
    Patent number: 5437738
    Abstract: The thermal resistance of a zinc chloride/ammonium chloride galvanizing preflux is improved by incorporating therein boric acid, other alkali metal chlorides and an aliphatic amino derivative. An improved zinc chloride/ammonium chloride galvanizing, top-flux includes a deoxidizer such as graphite or charcoal, other alkali metal chlorides and a foaming agent. Both compositions, the preflux and the top-flux, can be used to advantage in galvanizing steel with low lead or no lead zinc.
    Type: Grant
    Filed: June 21, 1994
    Date of Patent: August 1, 1995
    Inventors: Yum Gerenrot, David Leychkis, Thomas L. Ranck, James L. Griffin, Gary Stefanick