Patents by Inventor Kiyomasa Tsubota

Kiyomasa Tsubota 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).

  • Armature for direct current motor with imbalance correction
    Patent number: 4644201
    Abstract: Two or more imbalance correcting openings with the same cross-sectional configuration are provided in an armature core in parallel to a shaft in such a manner as to be equally spaced on a circumference which is concentric with the shaft, and weights are inserted in the adjacent openings to thereby correct any imbalance, the number of adjacent openings being selected to be (N-1)/2+1 or less when the number n of openings is odd and to be n/2 or less when the number n is even.
    Type: Grant
    Filed: July 15, 1985
    Date of Patent: February 17, 1987
    Assignee: Hitachi, Ltd.
    Inventors: Tatsuhiro Tani, Hiroyuki Nagasawa, Tosio Tomite, Kiyomasa Tsubota, Akira Takahashi