Patents by Inventor Donald H. Lewis

Donald H. Lewis 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).

  • Cathodic electrochemical process for preventing or retarding microbial and calcareous fouling
    Patent number: 4440611
    Abstract: This invention relates to a method for preventing or retarding microbial or calcareous fouling of a conducting or semi-conducting surface in an aqueous environment. This method produces an effective concentration of hydrogen peroxide at or near the surface to be protected by applying a sufficient cathodic voltage and a sufficient cathodic current to electrochemically generate an effective concentration of hydrogen peroxide. This effective concentration is preferably produced at very low current densities, i.e., at densities of less than about 100 microamperes per square centimeter. This effective concentration is further preferably produced at cathodic voltages less than that required to generate hydrogen gas at the cathode.
    Type: Grant
    Filed: December 9, 1981
    Date of Patent: April 3, 1984
    Assignee: The Texas A & M University System
    Inventors: Hari P. Dhar, John O. Bockris, Donald H. Lewis