Patents by Inventor Shigeru Isono

Shigeru Isono 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).

  • Level sensor
    Patent number: 5293221
    Abstract: A level sensor detects a vertical position of a laser beam emitted from an electronic leveling apparatus and comprises a photo-sensing unit having a predetermined vertical length for detecting the laser beam, a plurality of marking indices arranged on a side edge of a housing of the level sensor at a predetermined pitch along the vertical direction of the laser beam, and analog display unit having a plurality of display devices one for each of the marking indices for displaying a change in an incident position of the laser beam along the vertical direction by selective activation of the display devices.
    Type: Grant
    Filed: March 4, 1992
    Date of Patent: March 8, 1994
    Assignee: Nikon Corporation
    Inventors: Eiichi Kitajima, Akihiko Morishita, Shigeru Isono