Patents by Inventor Ernst Ehrler

Ernst Ehrler 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 for the punching and removing of the sprue in an injection molding tool
    Patent number: 4820467
    Abstract: A sprue part is cut and removed from the injection mold part during the manufacture of information storage disks by an injection molding process. The highly sensitive molding of an information storage disk is protected from damage by the sprue and the deposition of dust particles during stripping by this process. The sprue is punched into a part serving as the die of the injection molding tool and subsequently removed, in particular by suction, through an orifice leading from inside the part, together with the dust particles generated in the punching process. Preferably, the sprue is punched out and removed with the injection molding tool closed. The injection molding tool must be opened only after the sprue and the dust have already been removed, thus ensuring that the molded product has an especially good quality.
    Type: Grant
    Filed: October 19, 1987
    Date of Patent: April 11, 1989
    Assignee: Krauss-Maffei A.G.
    Inventors: Ernst Ehrler, Martin Eichlseder, Edmund Theiss
  • Apparatus for the punching and removing of the sprue in an injection molding tool
    Patent number: 4715806
    Abstract: A sprue part is cut and removed from the injection mold part during the manufacture of information storage disks by an injection molding process. The highly sensitive molding of an information storage disk is protected from damage by the sprue and the deposition of dust particles during stripping by this process. The sprue is punched into a part serving as the die of the injection molding tool and subsequently removed, in particular by suction, through an orifice leading from inside the part, together with the dust particles generated in the punching process. Preferably, the sprue is punched out and removed with the injection molding tool closed. The injection molding tool must be opened only after the sprue and the dust have already been removed, thus ensuring that the molded product has an especially good quality.
    Type: Grant
    Filed: November 18, 1985
    Date of Patent: December 29, 1987
    Assignee: Krauss-Maffei A.G.
    Inventors: Ernst Ehrler, Martin Eichlseder, Edmund Theiss