Patents by Inventor Charles L. K. Tennakoon

Charles L. K. Tennakoon 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).

  • Patent number: 7892408
    Abstract: A cathodic gas diffusion electrode for the electrochemical production of aqueous hydrogen peroxide solutions. The cathodic gas diffusion electrode comprises an electrically conductive gas diffusion substrate and a cathodic electrocatalyst layer supported on the gas diffusion substrate. A novel cathodic electrocatalyst layer comprises a cathodic electrocatalyst, a substantially water-insoluble quaternary ammonium compound, a fluorocarbon polymer hydrophobic agent and binder, and a perfluoronated sulphonic acid polymer. An electrochemical cell using the novel cathodic electrocatalyst layer has been shown to produce an aqueous solution having between 8 and 14 weight percent hydrogen peroxide. Furthermore, such electrochemical cells have shown stable production of hydrogen peroxide solutions over 1000 hours of operation including numerous system shutdowns.
    Type: Grant
    Filed: November 6, 2007
    Date of Patent: February 22, 2011
    Assignee: Lynntech, Inc.
    Inventors: Christopher P. Rhodes, Charles L. K. Tennakoon, Waheguru Pal Singh, Kelvin C. Anderson
  • Publication number: 20090114532
    Abstract: A cathodic gas diffusion electrode for the electrochemical production of aqueous hydrogen peroxide solutions. The cathodic gas diffusion electrode comprises an electrically conductive gas diffusion substrate and a cathodic electrocatalyst layer supported on the gas diffusion substrate. A novel cathodic electrocatalyst layer comprises a cathodic electrocatalyst, a substantially water-insoluble quaternary ammonium compound, a fluorocarbon polymer hydrophobic agent and binder, and a perfluoronated sulphonic acid polymer. An electrochemical cell using the novel cathodic electrocatalyst layer has been shown to produce an aqueous solution having between 8 and 14 weight percent hydrogen peroxide. Furthermore, such electrochemical cells have shown stable production of hydrogen peroxide solutions over 1000 hours of operation including numerous system shutdowns.
    Type: Application
    Filed: November 6, 2007
    Publication date: May 7, 2009
    Inventors: Christopher P. Rhodes, Charles L.K. Tennakoon, Waheguru Pal Singh, Kelvin C. Anderson
  • Patent number: 6949178
    Abstract: A method and apparatus for the generation and collection of an aqueous peracid solution at the cathode of a PEM electrolyzer. The electrochemical process introduces carboxylic acid (such as distilled table vinegar, lactic acid, citric acid or combinations) to the anode and a source of oxygen to the cathode. The PEM electrolyzer has a gas diffusion cathode having a cathodic electrocatalyst that is capable of hydrogen peroxide generation. The peracid solution is generated at the gas diffusion cathode and the solution is very pure and may be used for disinfecting or sterilizing various items or solutions. In a second embodiment, the carboxylic acid may be provided directly to the cathode, such as in the form of an acid vapor.
    Type: Grant
    Filed: July 9, 2002
    Date of Patent: September 27, 2005
    Assignee: Lynntech, Inc.
    Inventors: Charles L. K. Tennakoon, K. Scott McKenzie, Michelle Will, Elizabeth I. H. McGrew
  • Publication number: 20040213698
    Abstract: An apparatus and method for electrochemically generating and using an aqueous solution containing chlorine dichloride and a metal hypochlorite, such as sodium hypochlorite. The aqueous solution provides a mouth rinse for oral hygiene or a sterilizing solution for surgical or dental tools or for treating drinking water. The generator comprises a chamber, an anode and a cathode disposed for fluid communication with a reservoir, and an electrical power source for applying a voltage between the anode and the cathode. The reservoir contains an electrolyte having a metal chlorite and, optionally, a metal chloride, citric acid, sweeteners, flavorings and combinations thereof. The anode is preferably a dimensionally stable anode coated with RuO2, IrO2 or combinations thereof. The cathode may be made of titanium substrate coated with platinum. The apparatus and method generate an aqueous solution containing chlorine dioxide that may be used immediately for oral hygiene.
    Type: Application
    Filed: April 25, 2003
    Publication date: October 28, 2004
    Inventors: Charles L.K. Tennakoon, Rattaya C. Yalamanchili, Elizabeth I. McGrew
  • Publication number: 20040007476
    Abstract: A method and apparatus for the generation and collection of an aqueous peracid solution at the cathode of a PEM electrolyzer. The electrochemical process introduces carboxylic acid (such as distilled table vinegar, lactic acid, citric acid or combinations) to the anode and a source of oxygen to the cathode. The PEM electrolyzer has a gas diffusion cathode having a cathodic electrocatalyst that is capable of hydrogen peroxide generation. The peracid solution is generated at the gas diffusion cathode and the solution is very pure and may be used for disinfecting or sterilizing various items or solutions. In a second embodiment, the carboxylic acid may be provided directly to the cathode, such as in the form of an acid vapor.
    Type: Application
    Filed: July 9, 2002
    Publication date: January 15, 2004
    Inventors: Charles L. K. Tennakoon, K. Scott McKenzie, Michelle Will, Elizabeth I.H. McGrew