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:
Sep. 27, 2022
Filed:
Aug. 25, 2017
Applicant:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Inventors:
Yuh Ishida, Itami, JP;
Hitoshi Sumiya, Itami, JP;
Assignee:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B 21/064 (2006.01); C04B 35/645 (2006.01); C04B 35/626 (2006.01); C04B 35/5831 (2006.01); B23B 27/14 (2006.01); B24D 3/34 (2006.01);
U.S. Cl.
CPC ...
C01B 21/0648 (2013.01); B23B 27/148 (2013.01); B24D 3/346 (2013.01); C04B 35/5831 (2013.01); C04B 35/6268 (2013.01); C04B 35/62675 (2013.01); C04B 35/645 (2013.01); B23B 2226/12 (2013.01); C01P 2002/60 (2013.01); C01P 2002/76 (2013.01); C01P 2006/90 (2013.01); C04B 2235/386 (2013.01); C04B 2235/5436 (2013.01); C04B 2235/5445 (2013.01); C04B 2235/5454 (2013.01); C04B 2235/76 (2013.01); C04B 2235/781 (2013.01); C04B 2235/96 (2013.01);
Abstract
A method of producing a boron nitride polycrystal includes: a first step of obtaining a thermally treated powder by thermally treating a powder of a high pressure phase boron nitride at more than or equal to 1300° C.; and a second step of obtaining a boron nitride polycrystal by sintering the thermally treated powder under a condition of 8 to 20 GPa and 1200 to 2300° C.