Patents by Inventor K. Douglass Lum

K. Douglass Lum 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).

  • Locking joint
    Patent number: 5785357
    Abstract: A threaded joint is provided with a locking mechanism for resisting loosening and over torquing. The joint has splines that are alignable with axially directed fingers, and shear plates that are movable into the spaces between the splines and the fingers. The shear plates may be supported by a shear ring. A lock ring may be provided for maintaining the shear plates between the respective spaces. Another embodiment of the joint has a knurled portion that is alignable with axially directed fingers. The joint also includes a clamp ring engageable with the fingers.
    Type: Grant
    Filed: June 21, 1996
    Date of Patent: July 28, 1998
    Assignee: UTD, Inc.
    Inventors: Eugene L. Foster, K. Douglass Lum