Patents Represented by Law Firm Leydig, Voit, Osann, Mayer & Hoyt, Ltd.
  • 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