Patents by Inventor Kazumi Ishikawa

Kazumi Ishikawa 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).

  • Thermal printing head and method of making same
    Patent number: 4194108
    Abstract: A thermal printing head for printing alphanumeric characters on a thermally-responsive medium, the head being faced with a pattern of heat generating "dot" elements electrically insulated from one another and having conductive leads, with means for connecting the leads selectively to a source of electric current. The heat generating elements are formed of a film of boron phosphide. Preferably the leads are also formed of boron phosphide, integral with the elements, but "doped" to secure a high degree of conductivity.
    Type: Grant
    Filed: January 18, 1978
    Date of Patent: March 18, 1980
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Takashi Nakajima, Katsuto Nagano, Kazumi Ishikawa