Patents by Inventor Tamio Fukuda

Tamio Fukuda 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).

  • Piston stroke control device for free piston type oscillating compressors
    Patent number: 4613285
    Abstract: In a free piston type oscillating compressor, closed spaces separate from gas springs are provided, and pressures of the closed spaces are regulated, whereby the amplitude, and central position of the stroke, of a free piston can be precisely controlled.
    Type: Grant
    Filed: April 2, 1985
    Date of Patent: September 23, 1986
    Assignee: Hitachi, Ltd.
    Inventors: Eiji Sato, Tamio Fukuda, Masaharu Ishii, Mitsuru Nakamura, Yozo Nakamura
  • Multi-stage absorption refrigeration system
    Patent number: 4520634
    Abstract: A triple-stage absorption refrigeration system including three generators. Solution is supplied from absorber directly to each of the three generators in parallel with each other without flowing through any other generator, and cooling medium is made to flow firstly through the condenser and then through the absorber. Due to these features, corrosion of walls of the first generator in which temperature becomes highest can be inhibited.
    Type: Grant
    Filed: April 12, 1984
    Date of Patent: June 4, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Tomihisa Oouchi, Sampei Usui, Tamio Fukuda, Akira Nishiguchi