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:
Dec. 31, 1991
Filed:
Aug. 24, 1990
Minoru Akagawa, Fremont, CA (US);
Ryo Narisawa, Palo Alto, CA (US);
Intelmatec Corporation, Fremont, CA (US);
Abstract
A disk polisher has a horizontal turntable for moving workpieces around thereon and an assembly for holding flat grinding surfaces of grinding stone against these moving workpieces. The grinding stone pieces are provided with throughholes and are attached to a supporting body having internal passageways. Orifices are provided to connect these internal passageways with the throughholes such that a high-pressure fluid such as air can be directed through the passageways and the throughholes to apply external force on processed workpieces which tend to stick to the grinding surfaces due to the surface tension of water used for grinding. The diametrical shapes of the orifices and throughholes are carefully determined such that the processed workpieces can be reliably separated while the pressure drop inside the passageway due to escaping air will be minimized.