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:
Aug. 19, 2025
Filed:
Jul. 20, 2020
Applicant:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Inventors:
Hitoshi Sumiya, Osaka, JP;
Yuh Ishida, Osaka, JP;
Assignee:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23B 27/14 (2006.01); C01B 21/04 (2006.01); C01B 21/064 (2006.01); C04B 35/5831 (2006.01); B23C 5/16 (2006.01);
U.S. Cl.
CPC ...
C01B 21/064 (2013.01); B23B 27/148 (2013.01); C04B 35/5831 (2013.01); B23B 27/14 (2013.01); B23B 2226/125 (2013.01); B23C 5/16 (2013.01); C01P 2002/76 (2013.01); C01P 2004/03 (2013.01); C01P 2004/54 (2013.01); C01P 2004/64 (2013.01); C01P 2006/90 (2013.01); C04B 2235/386 (2013.01);
Abstract
A polycrystalline cubic boron nitride includes a cubic boron nitride particle group. The ratio of a second length to a first length is 0.99 or less. Here, each of the first length and the second length is a value measured on a surface of the polycrystalline cubic boron nitride with an indentation formed by a Knoop hardness test under conditions specified in ISO4545-1 and ISO4545-4. The second length represents the length of the longer diagonal of the indentation. The first length represents the sum of the second length and the length of the streaky indentation.