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. 27, 2003
Filed:
Apr. 17, 2001
Norihiko Miyata, Nagano, JP;
Showa Denko Kabushiki Kaisha, Tokyo, JP;
Abstract
An object of the present invention is to provide a composition for polishing a magnetic disk substrate that is used as a storage device for a computer or the like, and is capable of producing a magnetic disk substrate polished with high precision suitable for use in combination with a magnetic head that floats at a low level. Another object of the present invention is to provide a method of producing the composition for polishing the magnetic disk substrate. A polishing composition includes alkali metal ions, abrasive grains, a carboxylic acid, an oxidizing agent, and an anti-gelling agent contained in an aqueous medium. In a method of the present invention for preparing a polishing composition, a pH value of an aqueous medium, in which abrasive grains, a carboxylic acid, an oxidizing agent, and an anti-gelling agent are contained, is adjusted to a range of about 1 to about 5 by the addition of alkali metal hydroxide to the aqueous medium.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile