Patents by Inventor Heinrich Sonntag

Heinrich Sonntag 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).

  • Core for molds for electrically melting metals for casting hollow ingots
    Patent number: 4269258
    Abstract: Mold core for electrically melting metals for casting hollow ingots wherein the core wall is divided lengthwise on its periphery and is designed to be taken apart. The wall is preferably made of at least two partial cylinders between which stave-like keys are positioned which can be removed inwardly.
    Type: Grant
    Filed: July 5, 1979
    Date of Patent: May 26, 1981
    Inventors: Heinrich Sonntag, Helmut Wallasch