Patents by Inventor John R. Kirkland

John R. Kirkland 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 for increasing resistance to treeing in polymeric insulating layer
    Patent number: 4360539
    Abstract: A method for increasing resistance to treeing in a polymeric layer comprising an insulating layer on a metal conductor. Pellets of an organic polymeric material also containing an organo silane treeing inhibitor are exposed to ultraviolet radiation, and pellets having portions fluorescing above a predetermined threshold level are separated from the remainder. The remaining pellets are blended together and applied to a metal conductor to form a coating on the conductor. In a preferred embodiment, the organic polymeric material is high molecular weight polyethylene, and the ultraviolet radiation has a wavelength of about 3000 to 4000 A.
    Type: Grant
    Filed: June 18, 1981
    Date of Patent: November 23, 1982
    Assignee: Aluminum Company of America
    Inventors: Sandra G. Sachtleben, John R. Kirkland