Patents by Inventor Masaya Hiraoka

Masaya Hiraoka 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).

  • Patent number: 5272883
    Abstract: A method and apparatus for the maintenance of snow quality on an indoor artificial ski slope. The snow quality of the slope, comprising a thin compacted surface layer and a deep unfused base layer, is maintained by promptly managing against the variations of snow quality due to various heat sources. The old surface layer snow is replaced with fresh snow on a daily basis, while deterioration of the snow base layer is prevented by air conditioning and refrigeration means. The old snow is melted, filtered, and used to make new snow, to air condition the slope, and to expedite melting of yet additional old snow.
    Type: Grant
    Filed: March 19, 1992
    Date of Patent: December 28, 1993
    Assignee: Kajima Corporation
    Inventors: Nobuyuki Matsui, Kazunobu Abe, Makoto Kayo, Osamu Sakaguchi, deceased, Itsuko Sakaguchi, legal representative, Yasuharu Kiso, Masaya Hiraoka