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. 12, 1992
Filed:
May. 18, 1990
Yasuhisa Shibata, Naka, JP;
Naoto Oki, Hitachi, JP;
Satoshi Ozawa, Hitachi, JP;
Hiroyuki Miyagi, Kokubunji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention provides an ion selective electrode for anions such as Cl.sup.- and cations such as Ca.sup.2+ which has a sensitive membrane comprising a polymer material and containing an ion sensitive material and a plasticizer. In thins ion selective electrode, the ion sensitive material is an ion exchanger such as a quaternary ammonium salt, a quaternary phosphonium salt or an organic phosphate and the plasticizer is a compound having the formula (1): ##STR1## wherein X represents an alkyl group, a phenyl group or a phenyl group to which a functional group bonds. As the plasticizer there may also be used a mixture of the compound of the formula (1) with an alcohol compound such as an alcohol having a dielectric constant of 10 or less and containing 10 or more carbon atoms or an ester compound.