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:
Jul. 24, 2007
Filed:
Mar. 23, 2005
Tadakazu Miyashita, Nagano, JP;
Hiromi Kishida, Nagano, JP;
Tadakazu Miyashita, Nagano, JP;
Hiromi Kishida, Nagano, JP;
Fujikoshi Machinery Corp., Nagano, JP;
Abstract
The polishing apparatus is capable of precisely controlling polishing pressure, correctly positioning a press plate and uniformly polishing a workpiece. In the polishing apparatus, a holding head comprises: first pressing means for introducing a pressurized fluid into a first fluid chamber and pressing a main head section downward; second pressing means for introducing a pressurized fluid into a second fluid chamber and pressing a press plate downward; and third pressing means for introducing a pressurized fluid into a third fluid chamber and pressing the workpiece downward. With this structure, the workpiece is held on the lower side of an elastic sheet member, and the lower face of the workpiece can be polished by a polishing plate.