Patents by Inventor David J. Pretorius

David J. Pretorius 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).

  • Selective embosser with buckling prevention
    Patent number: 4630537
    Abstract: A method and apparatus for embossing characters on a plate such as a motor vehicle registration plate are provided according to which the blank plate and dies are located between the movable and stationary members of a press, the movable member being contained in a cylinder wherein pressurized fluid can cause it in the nature of a piston to move towards the stationary member in order to effect the embossing operation on the plate.
    Type: Grant
    Filed: August 22, 1985
    Date of Patent: December 23, 1986
    Assignee: The National Savings & Finance Corp. (Proprietary) Limited
    Inventor: David J. Pretorius