Patents by Inventor Leslie Markwart

Leslie Markwart 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).

  • Tool bit retaining assembly
    Patent number: 5309798
    Abstract: A tool bit retaining assembly for a tool of a type having a tool bit receptacle and a spring receiving region with a hole opening into the receptacle and a tool bit insertable into the receptacle. The tool bit has a transverse groove proximate an insertion end thereof, and includes a ball bearing with a diameter only slightly larger than that of the hole such that upon being pressed against the hole the ball bearing extends through the hole into the receptacle and engages the transverse groove in said tool bit. A split ring spring having a split extending from one end to the other with a portion transverse to the axis thereof is positionable around said spring receiving region such that the transverse portion of the split is opposite the ball bearing.
    Type: Grant
    Filed: March 17, 1993
    Date of Patent: May 10, 1994
    Assignee: Inno-Ware Enterprises Limited
    Inventors: Ronald Markwart, Leslie Markwart
  • Screwdriver
    Patent number: D358316
    Type: Grant
    Filed: October 13, 1993
    Date of Patent: May 16, 1995
    Inventors: Ronald Markwart, Leslie Markwart