Patents by Inventor Frank D. Hartzell

Frank D. Hartzell 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: 4095934
    Abstract: An important fuel saving is achieved by recovering fuel gas from the pressure relief system of a processing complex such as an oil refinery without impairing safety features.
    Type: Grant
    Filed: March 24, 1977
    Date of Patent: June 20, 1978
    Assignee: Mobil Oil Corporation
    Inventors: Larry F. Jensen, Frank D. Hartzell, William S. Hutchison