Patents Assigned to Kyokuwei Optical Glass Co., Ltd.
  • Fabrication method for chamfered hole
    Patent number: 4800686
    Abstract: This invention relates to a method for boring a chamfered hole and a tool for the same hole to effect boring a through hole on a glass plate and to simultaneously effect chamfering on respective aperture on the both sides of the plate, and have the function to enable speedy and accurate boring work without bringing forth defective product with chipping-off, joggles on the glass plate.
    Type: Grant
    Filed: April 9, 1987
    Date of Patent: January 31, 1989
    Assignees: Kyokuwei Optical Glass Co., Ltd., Asahi Diamond Industrial Co., Ltd.
    Inventors: Toshihiko Hirabayashi, Keiji Honda