Patents by Inventor Iku Harada

Iku Harada 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).

  • Apparatus for abating noise in axial blower
    Patent number: 4171931
    Abstract: In an axial blower, the noise generated by the blower increases generally in proportion to the increasing number of rotations of the blower's rotor. It has been ascertained, however, that over a given range of rotational speeds, the magnitude of noise plotted in a graph as the function of the rotational speed describes not a smooth curve but a zigzagging curve, indicating that zones of rotational speeds producing high levels of noise and those producing low levels of noise are distributed irregularly.
    Type: Grant
    Filed: December 8, 1977
    Date of Patent: October 23, 1979
    Assignee: Agency of Industrial Science & Technology, Ministry of Inter-Trade and Industry
    Inventor: Iku Harada