Patents by Inventor Allan J. Johnston

Allan J. Johnston 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).

  • Method of treating aqueous liquids using light energy, ultrasonic energy, and a photocatalyst
    Patent number: 5130031
    Abstract: A process for efficiently removing halogenated organic compounds from contaminated aqueous liquids is described which comprises contacting the contaminated liquid with a photocatalyst while simultaneously exposing the contaminated liquid to both acoustic energy and light energy to efficiently decompose the halogenated organic compounds.
    Type: Grant
    Filed: November 1, 1990
    Date of Patent: July 14, 1992
    Assignee: SRI International
    Inventor: Allan J. Johnston
  • Immobilized valinomycin molecule for K+ sensor
    Patent number: 4973394
    Abstract: The present invention provides a stabilized potassium ion-selective membrane comprising lysine-substituted valinomycin covalently bound to a polymeric substrate. The membrane of the invention exhibits improved stability and is used either on ISEs or on solid-state coated wire or semiconductor devices.
    Type: Grant
    Filed: September 2, 1988
    Date of Patent: November 27, 1990
    Assignee: SRI International
    Inventors: Pepi Ross, Allan J. Johnston, Amrit K. Judd