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. 04, 1996
Filed:
Mar. 30, 1995
Applicant:
Inventors:
Assignee:
Mitsui Mining & Smelting Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01M / ; C01G / ;
U.S. Cl.
CPC ...
423605 ; 429224 ;
Abstract
In a method of producing manganese dioxide for a lithium primary battery, heat treatment for dehydrating water-containing manganese dioxide is carried out by continuously calcining the water-containing manganese dioxide at 440.degree. C. to 480.degree. C., preferably by controlling the flow rate of air introduced into the furnace to the value of from 20 to 2000 Nl per 1 kg water-containing manganese dioxide which is supplied into the furnace. According to this method, the residual bound water in the calcined manganese dioxide is reduced as compared those treated with a conventional method, and thus preservation property of a battery can be improved.