Patents by Inventor Preyer Helmut

Preyer Helmut 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).

  • Gas plug for metallurgical smelting crucibles
    Patent number: 5152954
    Abstract: The invention concerns a gas plug for metallurgic smelting crucibles with a sheet-metal sheathing that comprises at least the gas connection side part of the outer surface and the bottom, with the exception of an area for connecting the gas supply means.
    Type: Grant
    Filed: September 6, 1989
    Date of Patent: October 6, 1992
    Assignee: Radex-Heraklith Industriebeteiligungs Aktiengesellschaft
    Inventor: Preyer Helmut