Patents by Inventor Ayumi Nishidate

Ayumi Nishidate 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).

  • Metal tube and electric cable using the same
    Patent number: 5646372
    Abstract: A metal tube is formed from a metal tape. The metal tape is rounded to be abutted at the both side edges, and the edge-abutted portion is welded to provide a butt-welded seam. The metal tube includes an inner iron base layer, a chrome layer provided on the base layer, and an outer chrome oxide layer provided on the chrome layer. The chrome oxide layer is preferably toughened at the outer surface to provide an appropriate frictional resistance relative to forming tools.
    Type: Grant
    Filed: April 3, 1995
    Date of Patent: July 8, 1997
    Assignee: Hitachi Cable Ltd.
    Inventors: Takashi Sasaki, Ayumi Nishidate, Kenji Nagayama, Yoshinobu Sato