Patents by Inventor Heinz Duster

Heinz Duster 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).

  • Process of producing molded body from green molding sand
    Patent number: 5137091
    Abstract: Green sand is packed as molding sand into a compression mold and the green sand is precompacted in the mold using a hydraulic press and thereafter is finally compacted after the precompaction wherein prior to precompaction recesses formed in the molding tools are subjected to a vacuum for drawing the molding sand into the recesses. In this way, even complicated mold cores can be produced satisfactorily and efficiently from green sand.
    Type: Grant
    Filed: June 18, 1990
    Date of Patent: August 11, 1992
    Assignee: Goerg Fischer AG
    Inventor: Heinz Duster