Patents by Inventor William David Ortlepp

William David Ortlepp 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).

  • Rock bolt
    Patent number: 7445406
    Abstract: An anchor device which includes a pipe (16), an elongate member (18) which is partly inside the pipe and which has an end (20) which protrudes from the pipe (16), and a restraining component (22) which is engaged with the protruding end (20). The pipe (16) and the elongate member (18) are shaped with a plurality of deformations along their respective lengths such that the elongate member (18) can only be withdrawn from the tubular member (16) by further deforming the elongate member (18).
    Type: Grant
    Filed: February 25, 2003
    Date of Patent: November 4, 2008
    Assignees: Steffen, Robertson & Kirsten (South Africa) (Pty) Ltd.
    Inventor: William David Ortlepp