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:
Oct. 01, 2002
Filed:
Dec. 21, 2000
Yuichiro Shindo, Saitama-ken, JP;
Tsuneo Suzuki, late of Saitama-ken, JP;
Japan Energy Corporation, Tokyo, JP;
Abstract
A process for producing a high-purity Mn material comprising the steps of premelting crude Mn at 1250-1500° C. and vacuum distilling the melt at 1100-1500° C. The degree of vacuum during the vacuum distillation ranges from 5×10 torr to 10 torrs. A crucible for use in the vacuum distillation is a double crucible, which consists of inner and outer crucibles, and a carbon felt packed in the space therebetween. A high-purity Mn material for thin film deposition which contains a total of not more than 100 ppm impurity metallic elements, not more than 200 ppm oxygen, not more than 50 ppm nitrogen, not more than 50 ppm S, and not more than 100 ppm C.