Patents by Inventor Melvin D. Mendenhall

Melvin D. Mendenhall 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).

  • High performance overlay for rock drilling bits
    Patent number: 5535838
    Abstract: A method to apply a high performance overlay to a metal substrate of a rock bit to render the substrate surfaces of the rock bit more resistant to erosion, corrosion and substrate cracking while performing in an earthen formation is described. The method comprises the steps of bombarding the surfaces with a thermal spray of entrained fine particles of a cermet based composition at a velocity in excess of 3,000 ft/per sec. The resultant coating of the cermet based composition has a tensile bond strength in excess of 20,000 psi that results in an increase of the strain to fracture of the rock bit surface. The hard overlay has a resistance to severe service environments of high strain and shock tolerance as well as a higher load carrying capacity.
    Type: Grant
    Filed: May 31, 1994
    Date of Patent: July 16, 1996
    Assignee: Smith International, Inc.
    Inventors: Madapusi K. Keshavan, Kuttaripalayam T. Kembaiyan, Wayne C. Quantz, Robert C. Tucker, Jr., Melvin D. Mendenhall, Jean M. Quets
  • Carbide or boride coated rotor for a positive displacement motor or pump
    Patent number: 5395221
    Abstract: A rotor for a positive displacement motor or pump in which the rotor is coated with a metal carbide and metal alloy coating or a metal boride and metal alloy coating to impart excellent wear-resistance and corrosion-resistance properties to the rotor when used in abrasive and/or corrosion resistance environmental.
    Type: Grant
    Filed: March 18, 1993
    Date of Patent: March 7, 1995
    Assignee: Praxair S.T. Technology, Inc.
    Inventors: Robert C. Tucker, Jr., Melvin D. Mendenhall, Madapusi K. Keshavan