Patents by Inventor Sadamasa Shigitani

Sadamasa Shigitani 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).

  • Glass substrate chamfering method and apparatus
    Patent number: 6341999
    Abstract: A method for glass substrate chamfering using a metal-bonded outer-surface grindstone 12 for simultaneously processing the end surface and the oblique surfaces of the outer periphery of a doughnut-like glass substrate 1 with a circular hole 1a at the center thereof, and a metal-bonded inner-surface grindstone 14 for simultaneously processing the end surface and the oblique surfaces of the inner periphery are provided; the outer-surface grindstone and the inner-surface grindstone simultaneously grind end surfaces and oblique surfaces of the outer and inner peripheries of the glass substrate, and during grinding, the outer-surface grindstone is sharpened by dressing it electrolytically, and the inner-surface grindstone is sharpened by an electrolytic dressing when not processing as the glass substrate is being replaced.
    Type: Grant
    Filed: September 26, 2000
    Date of Patent: January 29, 2002
    Assignees: Riken, Utksystem Corporation, The Nexsys Corporation
    Inventors: Hitoshi Ohmori, Muneaki Asami, Akihiko Uzawa, Sadamasa Shigitani