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. 02, 1995
Filed:
May. 15, 1991
Applicant:
Inventor:
Junichiro Suzuki, Gifu, JP;
Assignee:
NGK Spark Plug Co., Ltd., Nagoya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09B / ;
U.S. Cl.
CPC ...
501 97 ; 501 95 ; 501 98 ; 51307 ;
Abstract
A silicon nitride body having a surface portion comprising .alpha. sialon, or .alpha. sialon and .beta. sialon wherein the ratio of .alpha. sialon relative to the sum of .alpha. sialon and .beta. sialon is at least 0.6; and an inner portion comprising .beta. sialon, or .alpha. sialon and .beta. sialon, wherein the ratio of .beta. sialon relative to the sum of .alpha. sialon and .beta. sialon is at least 0.6.