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, 1996
Filed:
Dec. 27, 1994
Kenzo Kawaguchi, Aichi, JP;
Tetsuya Takemura, Aichi, JP;
Hideki Matsubara, Aichi, JP;
Sinya Takagi, Aichi, JP;
Atsushi Kanda, Aichi, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
An aluminum nitride sintered body comprising aluminum nitride as a main component, a titanium compound, and an yttrium compound, wherein when the content of titanium and the content of yttrium both in terms of percentage by weight based on the aluminum nitride sintered body are plotted on an x-y coordinate system, with the titanium content as the x axis and the yttrium content as the y axis, the titanium content and the yttrium content each is within a region surrounded by the lines connecting points A and B, B and C, C and D, D and E, and E and A, inclusive of the lines the points A, B, C, D and E being: A (0.2, 2.0) B (0.2, 6.5) C (1.0, 10.25) D (2.2, 10.25) E (2.2, 5.0).