Patents by Inventor Akihiko Nishisaka

Akihiko Nishisaka 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 for rotationally positioning a welded steel pipe in response to a seam section thereof and an apparatus for positioning the same
    Patent number: 3972432
    Abstract: Disclosed is an apparatus for rotationally positioning a welded steel pipe in response to a seam section thereof which comprises a driving means for subjecting the welded steel pipe to a high speed-normal rotation and low speed-counter rotation about its axis, a detecting signal-generating means including an AC bridge circuit, a sensor disposed close to the surface of the welded steel pipe, a differential amplifier and a synchronous detector, to produce, when the welded steel pipe makes a high speed-normal rotation, a negative peak voltage signal and in succession a positive peak voltage signal in response to the seam section of the welded steel pipe and to produce, when the welded steel pipe makes a low speed-back rotation.
    Type: Grant
    Filed: February 19, 1975
    Date of Patent: August 3, 1976
    Assignee: Nippon Kokan Kabushiki Kaisha
    Inventors: Toshihiro Mori, Katsujiro Watanabe, Akihiko Nishisaka