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. 03, 2011
Filed:
Jul. 23, 2007
Applicants:
Seung Wok Han, Seoul, KR;
Dong Eon Kim, Gyeonggi-do, KR;
Byung Gil Lim, Incheon, KR;
Inventors:
Assignee:
Dansuk Industrial Co., Ltd., Gyeonggi-do, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01G 29/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method of preparing bismuth oxide and an apparatus therefor are disclosed. The method includes: melting bismuth metal; transporting the melted bismuth metal to an open first reactor and oxidizing the melted bismuth metal while stirring at a temperature of 300-650° C.; and transporting bismuth oxide and un-reacted material to a closed second reactor through a screw and oxidizing the bismuth oxide and un-reacted material while rotating the closed second reactor at a temperature of 300-600° C. with a supply of air or oxygen.