Patents by Inventor Josef Safrata

Josef Safrata 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).

  • Spark plug having ring shaped auxiliary electrode with thickened peripheral edges
    Patent number: 5760534
    Abstract: A spark plug with improved wear resistance includes an outer conductive housing, a ceramic insulator positioned within the housing, and a central electrode inside the insulator. One or more ring-shaped auxiliary electrodes are positioned on the ceramic insulator between the central electrode and the outer conductive housing. The one or more ring-shaped auxiliary electrodes have a central portion and peripheral edges which are thickened with respect to the central portion. The spark plug provides a spark gap between the central electrode and the auxiliary electrode and between the auxiliary electrode and the conductive housing.
    Type: Grant
    Filed: October 22, 1996
    Date of Patent: June 2, 1998
    Assignee: Brisk Tabor, a.s.
    Inventors: Jan Bednar, Josef Safrata