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. 31, 2010
Filed:
Jan. 03, 2008
Keiji Sumiya, Tsukuba, JP;
Nachimuthu Senguttuvan, Tsukuba, JP;
Hiroyuki Ishibashi, Hitachinaka, JP;
Keiji Sumiya, Tsukuba, JP;
Nachimuthu Senguttuvan, Tsukuba, JP;
Hiroyuki Ishibashi, Hitachinaka, JP;
Hitachi Chemical Company, Ltd., Tokyo, JP;
Abstract
Provided are a crucible which prevents polycrystal formation to easily allow growth of optical part material single crystals, and a single crystal growth method employing the crucible. The crucible has a smooth surface of about Rmax 3.2 s as the surface roughness of the wall surfaceH, concave curved planeJ, cone surfaceF and convex curved planeL of the starting material carrying sectionD and the wall surfaceK of the seed carrying sectionE, which constitute the inner surface of the crucible of a crucible bodyA.