Patents by Inventor John L. Douthitt

John L. Douthitt 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).

  • Pivoting skid blender trailer
    Patent number: 4311395
    Abstract: A unique chassis arrangement for the mounting of equipment thereon and a unique equipment arrangement for a ground fed type blender means which is trailer mounted for use in well servicing operations.
    Type: Grant
    Filed: June 25, 1979
    Date of Patent: January 19, 1982
    Assignee: Halliburton Company
    Inventors: John L. Douthitt, Gail F. Davis