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. 07, 2003
Filed:
Sep. 06, 2001
Kousuke Nakajima, Samukawa-machi, JP;
Junko Ishioka, Sagamihara, JP;
Katsuhiko Yamaguchi, Sagamihara, JP;
Naoyuki Goto, Machida, JP;
Takayuki Kishi, Sagamihara, JP;
Kabushiki Kaisha Ohara, Kanagawa-ken, JP;
Abstract
A high rigidity glass-ceramic substrate is provided which contains, as a predominant crystal phase or phases, at least one crystal phase selected from the group consisting of enstatite (MgSiO ), enstatite solid solution (MgSiO solid solution), magnesium titanate (MgTi O ) and magnesium titanate solid solution (MgTi O solid solution), has fine crystal grains (preferably globular crystal grains) of precipitated crystal phases, has excellent melting property of a base glass, high resistivity to devitrification, easiness in polishing, excellent smoothness in the surface after polishing and has high Young's modulus capable of coping with a high speed rotation.