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:
Jun. 24, 2003
Filed:
Jun. 14, 2000
Kabushiki Kaisha Ohara, Kanagawa-ken, JP;
Abstract
There is provided a glass-ceramic substrate which is suitable for use as a light filter. The glass-ceramic has a Young's modulus (GPa) within a range from 95 to 120 and includes 5.3 to 8 weight percent (expressed on an oxide basis) of Al O . Tile glass ceramic substrate preferably has, as its predominant crystal phases, (a) lithium disilicate (Li O·2SiO ) and b) at least one of &agr;-quartz (&agr;-SiO ) and &agr;-quartz solid solution (&agr;-SiO solid solution), has a specific gravity within a range from 2.4 to 2.6 and has a coefficient of thermal expansion within a range from 65×10 /° C. to 130×10 /° C. within a temperature range from −50° C. to +70° C.