Patents by Inventor Toshibumi Kakinuma

Toshibumi Kakinuma 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).

  • Method and apparatus for checking operation of solenoid
    Patent number: 5243296
    Abstract: When a solenoid has been turned on by supplying current to a coil thereof, the solenoid operation is checked by temporarily ceasing the supply of current to the coil to temporarily deenergize the solenoid. The current flowing in the coil is detected while the solenoid is temporarily deenergized, and the characteristics of the thus detected current are used to discriminate the position of a movable iron core of the solenoid. On the other hand, when the solenoid has been turned off by ceasing the supply of current to the coil, the solenoid operation is checked by temporarily supplying current to the coil to thereby temporarily energize the solenoid. The current flowing in the coil while the solenoid is temporarily energized is detected, and the characteristics of the thus detected coil current are used to determine the position of the movable iron core of the solenoid.
    Type: Grant
    Filed: October 18, 1991
    Date of Patent: September 7, 1993
    Assignee: Tokimec Inc.
    Inventors: Tsuyoshi Ando, Toshibumi Kakinuma, Tomokazu Kominami, Kazuyuki Kihara, Kousuke Hatakenaka, Akio Mito