The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 1985
Filed:
May. 11, 1982
Applicant:
Inventor:
Shigeru Fujimoto, Yokohama, JP;
Assignee:
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
B24B / ; B24D / ;
U.S. Cl.
CPC ...
5110 / ; 5120 / ; 5128 / ; 409132 ; 409166 ;
Abstract
Method and apparatus for forming a ring-shaped oblique groove in a semiconductor device such as a semiconductor rectifier element for electric power. The method of the present invention is based on the idea of forming the ring-shaped oblique groove with a rotating grinding wheel. The semiconductor device is rotated, and the rotating grinding wheel is made to cut into the rotating semiconductor device to form the groove therein. The grinding wheel is sloped relative to the semiconductor device toward the center of the semiconductor device.