Patents by Inventor Tetsuya Kotoda

Tetsuya Kotoda 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).

  • Method of producing hollow electroformed product of precious metal
    Patent number: 5837118
    Abstract: A method of producing a hollow electroformed product of precious metal includes the steps of forming a hollow soluble metal electroformed layer soluble in an inorganic acid on the outer surface of a master model formed of a low melting point material or a chemically soluble material soluble in a chemical, melting or dissolving and removing the master model from inside the soluble metal electroformed layer, coating the outer surface of the remaining soluble metal electroformed layer with a masking layer, forming a precious metal electroformed layer on the inner surface of the soluble metal electroformed layer, stripping the masking layer, and dissolving the soluble metal electroformed layer with inorganic acid.
    Type: Grant
    Filed: February 7, 1996
    Date of Patent: November 17, 1998
    Assignee: M. Yasui & Co., Ltd.
    Inventors: Shozui Yasui, Tetsuya Kotoda