Patents by Inventor Carl E. Helldin

Carl E. Helldin 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).

  • Insulated sprue bushing
    Patent number: 6331106
    Abstract: A device useful for injection molding of thermoplastic material includes a sprue bushing. The sprue bushing, which may include a front piece, improves the possibilities to reduce the heat dissipation from the thermoplastic material to the material in and adjacent to the tip of the bushing and the wear of the material of the bushing is reduced. An insert bushing of ceramic material may also be present at the tip of the sprue bushing/front piece.
    Type: Grant
    Filed: December 4, 1998
    Date of Patent: December 18, 2001
    Assignee: Nils Helldin AB
    Inventor: Carl E. Helldin