Patents by Inventor Tsutomu Shinkawa

Tsutomu Shinkawa 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).

  • Patent number: 4421152
    Abstract: A precision casting device especially suitable for dental use, which includes melting and casting chambers supported by a frame such that they are arranged coaxially up and down in the frame under a normal operating state and can be drawn horizontally out of the frame during service time in order to facilitate access to the interiors of them, and which is provided with evacuating apparatus and an inert gas supply and can carry out the casting process in which a casting material is molten in an inert atmosphere, the molten material is then supplied to a mold in a vacuum state and, therafter, casting is effected under a pressure of inert atmosphere.
    Type: Grant
    Filed: March 2, 1981
    Date of Patent: December 20, 1983
    Assignee: Sansha Electric Mfg. Co., Ltd.
    Inventors: Tsutomu Shinkawa, Akihide Yoshino, Hitoshi Konishi, Yoshiaki Komuro, Satoshi Hamada, Saburo Okumura
  • Patent number: 4354831
    Abstract: A crucible used with a precision casting device, especially used for dental purposes, which is vertically or axially divided into a plurality of segments, these segments being held together to form a complete crucible during heating and melting steps and readily released to discharge the contents downwards during casting step.
    Type: Grant
    Filed: February 24, 1981
    Date of Patent: October 19, 1982
    Assignee: Sansha Electric Mfg. Co., Ltd.
    Inventors: Tsutomu Shinkawa, Hiroaki Tokuda