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. 05, 2023
Filed:
Sep. 21, 2018
Applicant:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Inventors:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03H 9/02 (2006.01); H03H 3/08 (2006.01); H03H 9/25 (2006.01); H10N 30/06 (2023.01); H10N 30/072 (2023.01); H10N 30/086 (2023.01);
U.S. Cl.
CPC ...
H03H 9/02574 (2013.01); H03H 3/08 (2013.01); H03H 9/02559 (2013.01); H03H 9/02897 (2013.01); H03H 9/25 (2013.01); H10N 30/06 (2023.02); H10N 30/072 (2023.02); H10N 30/086 (2023.02);
Abstract
A ceramic substrate is formed of polycrystalline ceramic and has a supporting main surface. At the supporting main surface of the ceramic substrate, the mean of grain sizes of the polycrystalline ceramic is 0.5 μm or more and less than 15 μm and the standard deviation of the grain sizes is less than 1.5 times the mean.