Patents by Inventor Roman Puzniak

Roman Puzniak 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).

  • Oxide superconductor and process of producing the same
    Patent number: 5776862
    Abstract: The hole density of an oxide superconductor having holes as carriers is higher than the hole density to bring the highest value of the superconductivity critical temperature Tc thereof, and it can be made higher than the optimal density to bring the highest Tc value by treating the oxide superconductor with heat in an oxidizing gas atmosphere, or by replacing positive ions constituting the oxide superconductor except for copper with ions of a low valence number. Accordingly, it is possible to substantially reduce the rate of decrease of the critical current density owing to an applied magnetic field when the magnetic field is applied parallel to the crystal c axis, and to allow a current conductor produced by using the oxide superconductor to have high critical current density.
    Type: Grant
    Filed: July 22, 1996
    Date of Patent: July 7, 1998
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Tohoku Electric Power Company, Incorporated, Toshiba Corporation, International Superconductivity Technology Center
    Inventors: Ryo Usami, Kazuyuki Isawa, Hiroshi Kubota, Roman Puzniak, Hisao Yamauchi, Shoji Tanaka