Patents by Inventor Tetsu Koji

Tetsu Koji 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).

  • Process for forming porous semiconductor region using electrolyte without electrical source
    Patent number: 4092445
    Abstract: A process is disclosed for forming a porous region in a semiconductor device. In the process, a region of a relatively high impurity concentration is formed at a desired region of a semiconductor body of a lower impurity concentration. The semiconductor body is dipped into an electrolyte along with an electrode. The electrode is connected to the semiconductor body, whereby the high impurity concentration region is converted into a porous region.
    Type: Grant
    Filed: November 4, 1976
    Date of Patent: May 30, 1978
    Assignee: Nippon Electric Co., Ltd.
    Inventors: Naobumi Tsuzuki, Tetsu Koji, Kazuo Noguchi