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. 09, 2007
Filed:
Sep. 22, 2004
Shunichi Etoh, Toyonaka, JP;
Yasuki Yoshitomi, Higashiosaka, JP;
Tadahisa Arahori, Ashiya, JP;
Kuniaki Nakagawa, Matto, JP;
Kazumasa Mori, Kanazawa, JP;
Shunichi Etoh, Toyonaka, JP;
Yasuki Yoshitomi, Higashiosaka, JP;
Tadahisa Arahori, Ashiya, JP;
Kuniaki Nakagawa, Matto, JP;
Kazumasa Mori, Kanazawa, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
Abstract
A high-strength machinable ceramic capable of high-precision fine machining has a coefficient of thermal expansion close to that of silicon and preferably a uniform blackish color which facilitates image processing of machined parts. The ceramic comprises a main constituent and a sintering aid. The main constituent comprises 30–59.95 mass % of boron nitride, 40–69.95 mass % of zirconia, optionally up to 20 mass % of silicon nitride and 0.05–2.5 mass % (calculated as an element) of at least one coloring additive, which is selected from C, Si, elements of Groups IIIA–IVB in the fourth period, elements of Groups IVA–VB in the fifth period, elements of Groups IVA–VIB in the sixth period of the long form periodic table, and compounds of these elements.