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:
Jul. 24, 2018
Filed:
Apr. 09, 2013
Showa Denko K.k., Tokyo, JP;
Kazumi Naito, Tokyo, JP;
Shouji Yabe, Tokyo, JP;
SHOWA DENKO K.K., Tokyo, JP;
Abstract
A capacitor element including at least an anode body composed of a sintered compact containing tungsten as a main component, a dielectric layer with a smooth surface formed by chemical conversion of the surface of the anode body, and a semiconductor layer laminated on the dielectric layer. The capacitor is obtained by a production method which includes the steps of chemically converting the surface layer of the tungsten powder sintered compact into the dielectric layer in an aqueous solution containing 0.05 to 12% by mass of an oxidant composed of an oxygen-containing compound at a solution temperature of 62° C. or less, and removing all or most of water adhering to the inner surface of pores at a temperature of less than the boiling point of water, followed by drying at a temperature of not less than the boiling point of water.