Patents by Inventor Robert H. Willison

Robert H. Willison 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).

  • Antifriction screw drive
    Patent number: 5535638
    Abstract: A screw and nut have intermeshed helical threads which may be of a form selected from a variety of shapes; for example, a buttress thread. A ball track is formed by cooperating grooves in opposing flanks of the screw and nut threads, and a circuit of balls are disposed within the ball track. The result is a screw system with improved thrust load-carrying capability.
    Type: Grant
    Filed: November 10, 1994
    Date of Patent: July 16, 1996
    Assignee: Cincinnati Milacron Inc.
    Inventor: Robert H. Willison