Patents by Inventor Daniel Czerwiec

Daniel Czerwiec 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).

  • Process for the electrolysis of technical-grade hydrochloric acid contaminated with organic substances using oxygen-consuming cathodes
    Patent number: 6402930
    Abstract: A process for electrolyzing an aqueous solution of hydrochloric acid to chlorine in an electrochemical cell provided with an anode compartment and a cathode compartment including at least one gas diffusion cathode comprising an electrically conductive web provided on at least one side thereof with a coating of a catalyst for the electroreduction of oxygen comprising rhodium sulfide and optionally containing at least one fluorinated binder incorporated therein, comprising introducing aqueous hydrochloric acid containing contaminant species into the anode compartment and oxygen into the cathode compartment while impressing a direct electric current on the cell.
    Type: Grant
    Filed: September 1, 2000
    Date of Patent: June 11, 2002
    Assignees: De Nora Elettrodi S.p.A., Bayer AG
    Inventors: Robert J. Allen, James R. Giallombardo, Daniel Czerwiec, Emory S. De Castro, Khaleda Shaikh, Fritz Gestermann, Hans-Dieter Pinter, Gerd Speer
  • Rhodium electrocatalyst and method of preparation
    Patent number: 6358381
    Abstract: The invention relates to a novel rhodium sulfide catalyst for the reduction of oxygen in industrial electrolyzers. The catalyst is highly resistant towards corrosion and poisoning by organic species, thus resulting particularly suitable for use in aqueous hydrochloric acid electrolysis, when technical grade acid containing organic contaminants is employed.
    Type: Grant
    Filed: July 14, 2000
    Date of Patent: March 19, 2002
    Assignee: De Nora S.p.A.
    Inventors: Robert J. Allen, James R. Giallombardo, Daniel Czerwiec, Emory S. De Castro, Khaleda Shaikh
  • Rhodium electrocatalyst and method of preparation
    Patent number: 6149782
    Abstract: The invention relates to a novel rhodium sulfide catalyst for the reduction of oxygen in industrial electrolyzers. The catalyst is highly resistant towards corrosion and poisoning by organic species, thus resulting particularly suitable for use in aqueous hydrochloric acid electrolysis, when technical grade acid containing organic contaminants is employed.
    Type: Grant
    Filed: May 27, 1999
    Date of Patent: November 21, 2000
    Assignee: De Nora S.p.A
    Inventors: Robert J. Allen, James R. Giallombardo, Daniel Czerwiec, Emory S. De Castro, Khaleda Shaikh
  • Catalysts for gas diffusion electrodes
    Patent number: 5958197
    Abstract: A gas diffusion electrode comprising an electrically conductive web provided on at least one side thereof with a coating containing a rhodium--rhodium oxide catalyst on a carbon black support and a method for the preparation of the rhodium--rhodium oxide catalyst.
    Type: Grant
    Filed: January 26, 1998
    Date of Patent: September 28, 1999
    Assignee: De Nora S.p.A.
    Inventors: Robert J. Allen, Daniel Czerwiec, James R. Giallombardo, Khaleda Shaikh