Patents by Inventor Otto Erdman

Otto Erdman 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).

  • Induction crucible furnace
    Patent number: 3944715
    Abstract: An induction crucible furnace having a crucible surrounded by an induction coil member that is prestressed in axial direction by ring members disposed at opposite ends of the coil member and connected together by a plurality of tie rods extending parallel to the axis of the coil member and distributed uniformly about the periphery of the crucible one of the ring members being fixed to a base frame of the furnace, includes spacer means disposed between the ring members and the coil member and having inner and outer diameters matching those of at least one of the members.
    Type: Grant
    Filed: April 11, 1974
    Date of Patent: March 16, 1976
    Assignee: Brown, Boveri & Cie Aktiengesellschaft
    Inventors: Fritz Hegewaldt, Horst Gillhaus, Otto Erdman