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:
Jan. 09, 2001
Filed:
Sep. 14, 1999
Keiichi Kajiyama, Tokyo, JP;
Kazuma Sekiya, Tokyo, JP;
Disco Corporation, Tokyo, JP;
Abstract
Disclosed is an improved method of forming a series of hills and valleys alternately arranged at a predetermined pitch on the surface of a given workpiece. It comprises the steps of: carrying out a first grinding on the workpiece with a saw-toothed grindstone having a series of hills and valleys alternately arranged at “N” pitches (“N” being two or more integer or whole number), the height measured from the bottom of the valley to the peak of the hill in the saw-toothed grindstone being taller than the corresponding height in the workpiece; moving the saw-toothed grindstone and/or the workpiece one pitch relative to each other to carry out a second grinding on the workpiece; and repeating the relative movement of one-pitch long-distance and sequential grinding until the final “N”th grinding has been finished. All grindings are effected while the workpiece is being cooled by cooling water.