Patents by Inventor Masao Niijima

Masao Niijima 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).

  • Metal halide discharge lamp
    Patent number: 5220244
    Abstract: A metal halide lamp of the present invention comprises a luminous tube alone without any outer bulb, the luminous tube containing metal halides such as neodymium halides (NdX.sub.3), dysprosium halides (DyX.sub.3) and cesium halides (CsX) in a total amount by mole of 1.times.10.sup.-6 to 8.times.10.sup.-6 mol/cc and the following molar ratios: ##EQU1## as well as rare gas serving as starting auxiliary gas and mercury serving as buffer gas. This structure permits a predetermined vapor pressure of the metal halides sealed in the luminous tube to be obtained without increasing the wall load, as well as the formation of a metal halide lamp having a long life and good color characteristics.
    Type: Grant
    Filed: November 27, 1991
    Date of Patent: June 15, 1993
    Assignee: Iwasaki Electric Co. Ltd.
    Inventors: Kyoichi Maseki, Masao Niijima, Akira Urushihara, Shinya Suzuki, Kazushi Tominaga