Patents by Inventor Stuart R. Harper

Stuart R. Harper 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).

  • Mediated hydrohalic acid electrolysis
    Patent number: 7341654
    Abstract: Chlorine is produced by electrolysis of aqueous HCl, in a membrane electrolyzer, using cathodic mediators such as Fe(III) and/or Cu(II) chlorides and a non-catalysed 3-dimensional cathode, with the real surface area at least ten times higher than its projected area. The HCl electrolysis section is combined with an oxidizer for regeneration of the mediator, product water removal step and optional HCl recovery step. Under optimized conditions chlorine can be produced at very high current densities of 30 kA/m2, without initiating undesired H2 evolution reaction at the cathode.
    Type: Grant
    Filed: May 21, 2003
    Date of Patent: March 11, 2008
    Assignee: Aker Kvaerner Canada Inc.
    Inventors: Zbigniew Twardowski, Thomas Drackett, Stuart R. Harper
  • Mediated hydrohalic acid electrolysis
    Publication number: 20040074780
    Abstract: Chlorine is produced by electrolysis of aqueous HCl, in a membrane electrolyzer, using cathodic mediators such as Fe(III) and/or Cu(II) chlorides and a non-catalysed 3-dimensional cathode, with the real surface area at least ten times higher than its projected area. The HCl electrolysis section is combined with an oxidiser for regeneration of the mediator, product water removal step and optional HCl recovery step. Under optimised conditions chlorine can be produced at very high current densities of 30 kA/m2, without initiating undesired H2 evolution reaction at the cathode.
    Type: Application
    Filed: May 21, 2003
    Publication date: April 22, 2004
    Applicant: Aker Kvaerner Canada Inc.
    Inventors: Zbigniew Twardowski, Thomas Drackett, Stuart R. Harper