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:
Nov. 14, 2000
Filed:
Oct. 05, 1999
Applicant:
Inventors:
Masao Nishioka, Tokoname, JP;
Naotaka Kato, Owariasahi, JP;
Assignee:
NGK Insulators, Ltd., Nagoya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C04B / ;
U.S. Cl.
CPC ...
501 88 ;
Abstract
A light-impermeable, high purity silicon carbide material including polycrystals of silicon carbide as a main ingredient, wherein the silicon carbide material has a porosity of not more than 0.1%, the content of each of metal elements contained in the silicon carbide material is not more than 200 ppb, a weight ratio of silicon relative to the entire weight of the silicon carbide material is 69.00 to 69.90 wt %, and a light transmittance of the silicon carbide material in a wavelength range of 0.4 to 25 .mu.m is not more than 0.05% per a thickness of 0.5 mm.