Patents by Inventor Thomas E. Pratt

Thomas E. Pratt 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).

  • Brake system with improved brake material
    Patent number: 4815572
    Abstract: A brake element and system where the brake friction surface of the element is a refractory metal carbide. The brake element has a molded carbon structure for mechanical and structural strength and the friction surface or surfaces thereon are converted to refractory metal carbide. The refractory metal carbide is preferably silicon carbide and the depth of conversion is preferably from 0.015 inches to 0.15 inches.
    Type: Grant
    Filed: July 24, 1987
    Date of Patent: March 28, 1989
    Assignee: Parker-Hannifin Corporation
    Inventors: Robert W. Froberg, Thomas E. Pratt, Bruce A. Grider, Otto C. Miller