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. 17, 2007
Filed:
Dec. 24, 2003
Masahiro Sekiguchi, Ryugasaki, JP;
Takuji Matsumoto, Ryugasaki, JP;
Hiroyuki Ebinuma, Ryugasaki, JP;
Masahiro Sekiguchi, Ryugasaki, JP;
Takuji Matsumoto, Ryugasaki, JP;
Hiroyuki Ebinuma, Ryugasaki, JP;
Daiichi Pure Chemicals Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a method for quantitatively determining a reducing substance, which comprises reacting a reducing substance in a test specimen with iron (III) ions, reacting iron (II) ions formed by reduction of the iron (III) ions or residual iron (III) ions with a metal indicator which is capable of reacting specifically with the iron (II) ions or the residual iron (III) ions to undergo color development, and carrying out quantitative determination by measuring the degree of color development, wherein a chelating agent which is specific to copper ions is added to the test specimen before the reaction of the reducing substance with the iron (III) ions; and a reagent used for it.