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. 10, 2011
Filed:
Feb. 24, 2005
Yoshiaki Matsunami, Tokyo, JP;
Shuhei Nagakubo, Tokyo, JP;
Takashi Shidomi, Tokyo, JP;
Masaki Kita, Kyoto, JP;
Junpei Yamashita, Kyoto, JP;
Yoshiaki Matsunami, Tokyo, JP;
Shuhei Nagakubo, Tokyo, JP;
Takashi Shidomi, Tokyo, JP;
Masaki Kita, Kyoto, JP;
Junpei Yamashita, Kyoto, JP;
Nippon Sheet Glass Company, Limited, Tokyo, JP;
GS Yuasa Corporation, Kyoto-shi, JP;
Abstract
A separator for a lead-acid battery enabling the lead acid battery to infallibly have a predetermined capacity after the initial charging and a prolonged service life by limiting the maximum quantity of reducing substance liberated or produced from the separator at or below a given level. The separator for a lead-acid battery comprising a porous membrane made mainly from a polyolefin resin, an inorganic powder and a mineral oil and containing a surface active agent as an auxiliary material, characterized in that the amount of any reducing substance liberated or eluted after 24 hours of electrolysis carried out at about 25° C. with a direct current of 1.2 A by using an electrolytic cell composed of the porous membrane, a positive electrode, a negative electrode and diluted sulfuric acid is 1.0 ml or less per 100 cmwhen calculated from the consumption of a (1/100)N potassium permanganate solution per 100 cmof the porous membrane.