Patents by Inventor Jacob Willem De Ruiter

Jacob Willem De Ruiter 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 melting furnace
    Patent number: 4060692
    Abstract: An induction melting furnace comprising a conical crucible and a conical induction coil which envelops the crucible. The induction furnace comprises means for bringing the crucible under a compression stress and for maintaining this compression stress during the melting process.
    Type: Grant
    Filed: June 14, 1976
    Date of Patent: November 29, 1977
    Assignee: U.S. Philips Corporation
    Inventors: Pieter Aart Naastepad, Jacob Willem DE Ruiter
  • Heating device
    Patent number: 3965334
    Abstract: A heating device, comprising a tubular body whose inner wall bounds a heating chamber for objects. Between the inner wall and the outer wall of this body a plurality of ducts is provided which are situated in a ring-shape about the heating chamber and which extend parallel to the tube axis. These ducts are separated from each other by rigid partitions. Each duct contains evaporable heat transport medium.
    Type: Grant
    Filed: April 25, 1973
    Date of Patent: June 22, 1976
    Inventors: George Albert Apolonia Asselman, David Bruce Green, Adrianus Petrus Johannes Castelijns, Pieter Aart Naastepad, Jacob Willem De Ruiter