Patents by Inventor Gerd Bohndorf

Gerd Bohndorf 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).

  • Refractory ceramic stopper, apparatus for support thereof, and assembly thereof
    Patent number: 5303905
    Abstract: A refractory ceramic stopper has therein a recess including an annular outwardly enlarged portion defining a stop surface. A stopper rod inserted into the recess in the stopper has a support surface. A plurality of spreadable members having opposite ends are positioned about the stopper rod and are inserted therewith into the recess in the stopper. The spreadable members are spread outwardly such that they enter the enlarged portion of the recess in the stopper with first ends of the spreadable members confronting the stop surface of the stopper and with second ends of the spreadable members confronting the support surface of the stopper rod. Thereby the spreadable members lock the stopper onto the stopper rod.
    Type: Grant
    Filed: September 23, 1992
    Date of Patent: April 19, 1994
    Assignee: Didier-Werke AG
    Inventors: Siegfried Pohl, Dirk Masurat, Ernst Luhrsen, Gerd Bohndorf