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. 10, 2022
Filed:
May. 28, 2019
Applicant:
Kyocera Corporation, Kyoto, JP;
Inventors:
Assignee:
KYOCERA Corporation, Kyoto, JP;
Primary Examiner:
Int. Cl.
CPC ...
C30B 15/34 (2006.01); C30B 29/20 (2006.01); C30B 29/66 (2006.01);
U.S. Cl.
CPC ...
C30B 15/34 (2013.01); C30B 29/20 (2013.01); C30B 29/66 (2013.01);
Abstract
A device for producing a tubular single crystal comprises a crucible, a heating means, a die disposed in the crucible, having an annular slit, and a pulling-up means. The upper surface of the die includes an upward slope that increases in height from the annular slit to an inner diameter side and an outer diameter side, respectively, progressing away from the annular slit, wherein the maximum height of the slope on the inner diameter side (H1) is greater than the maximum height of the slope on the outer diameter side (H2) and the difference (H1−H2) is 0.1 mm or more and less than 7.5 mm.