Patents by Inventor Johannes J. du Preez

Johannes J. du Preez 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).

  • Heating tile
    Patent number: 5451743
    Abstract: Heating tiles have electrical resistance wires on their under surfaces which are covered with a non-conducting sheet, adjacent tiles being physically and electrically connected to provide any chosen area for heating such as the bottom of a bird cage, kennel or for heating blankets.
    Type: Grant
    Filed: November 17, 1992
    Date of Patent: September 19, 1995
    Assignee: Denel (PTY) Limited T/A Naschem
    Inventor: Johannes J. du Preez