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. 10, 1995
Filed:
Jan. 17, 1989
Yoshiteru Kuwae, Kyoto, JP;
Katsuji Shiono, Kyoto, JP;
Takaaki Kishi, Kyoto, JP;
Hideki Shimamoto, Osaka, JP;
Hisao Nagara, Kyoto, JP;
Keiji Mori, Kyoto, JP;
Shingo Yoshida, Kyoto, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
This invention relates to an electrolyte for use in electrolytic capacitors and also to an electrolytic capacitor using the electrolyte. The solute for the electrolyte is a quaternary ammonium salt of either a carboxylic acid selected from the group consisting of phthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid and maleic acid, or an alkyl or nitro-substituted compound of the acid. The electrolytic capacitor has improved low temperature characteristics and an improved variation in characteristics at high temperatures in relation to time with a prolonged life.