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:
Jun. 11, 2002
Filed:
Jan. 31, 2000
Kunihiko Nagai, Samukawa-machi, JP;
Kohei Kodaira, Sapporo-shi, Hokkaido 002-8073, JP;
Hiroyuki Tanaka, Samukawa-machi, JP;
Hideki Sakamoto, Samukawa-machi, JP;
Other;
Abstract
In a monocrystal producing device using a pulling-down method, a raw material melt is continuously supplied into a crucible to grow a crystal by supplying a powdery raw material onto a premelt plate inside an electric furnace with a powdery raw material supplying device and melting the powdery raw material on the premelt plate to generate the raw material melt and causing this raw material melt to drop out inside the crucible A dry air is introduced into the powdery raw material inside the powdery raw material tank to prevent moisture of the raw material powder A transferring tube for transferring the raw material is cooled to prevent the filling in the transferring tube based on melting of the powdery raw material This makes it possible to produce a monocrystal having a stable chemical composition, a large diameter, and a long size at a low price.