Patents by Inventor Keiichi Hiraoka

Keiichi 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).

  • Boiler
    Publication number: 20090025659
    Abstract: Provided is a boiler including: a plurality of heat transfer tubes arranged to form a cylindrical shape between an upper header and a lower header to constitute a heat transfer tube row; and a plurality of longitudinal fins provided to close gaps between the heat transfer tubes without connecting the adjacent heat transfer tubes, the plurality of longitudinal fins being provided to a portion other than one of one end in a vertical direction of the heat transfer tube row and a part in a peripheral direction thereof.
    Type: Application
    Filed: April 11, 2008
    Publication date: January 29, 2009
    Inventors: Tomohiro Ookubo, Kyousuke Ookubo, Keiichi Hiraoka, Soji Sumi