Patents by Inventor Yasuhiro Sakamaki

Yasuhiro Sakamaki 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).

  • Revolution counter using a magnetic bubble device for multi-turn absolute encoder
    Patent number: 4990909
    Abstract: A multi-turn absolute encoder comprising a shaft angle encoder for measuring the turning angle of a rotating shaft, and a turn detector for detecting the number of turns of the rotating shaft, wherein the turn detector uses a magnetic bubble element for sequentially transferring magnetic bubbles in a pattern in accordance with a magnetic field generated by a permanent magnet turned by the shaft, and a detector to detect the number of turns of the shaft from the positions of the magnetic bubbles which are transferred in the pattern.
    Type: Grant
    Filed: September 21, 1989
    Date of Patent: February 5, 1991
    Assignee: Yokogawa Electric Corporation
    Inventors: Toshitugu Ueda, Fusao Kohsaka, Toshi Iino, Kunio Kazami, Hiroshi Nakayama, Yoshiaki Kudou, Yasuhiro Sakamaki