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. 21, 2020
Filed:
Feb. 10, 2015
Applicant:
Kurita Water Industries Ltd., Tokyo, JP;
Inventor:
Junichi Takahashi, Tokyo, JP;
Assignee:
KURITA WATER INDUSTRIES LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N 33/00 (2006.01); G01N 33/18 (2006.01); G01N 31/22 (2006.01); G01N 31/00 (2006.01); G01N 21/78 (2006.01);
U.S. Cl.
CPC ...
G01N 33/1853 (2013.01); G01N 21/78 (2013.01); G01N 31/00 (2013.01); G01N 31/22 (2013.01);
Abstract
A water hardness-measuring method and a fouling prevention method for hardness-measuring device include adding a colorant containing Eriochrome Black T and/or Calmagite and a sulfate ester-type anionic surfactant having a bonding unit derived from a sulfate ester including an alkyl group having 8 to 18 carbon atoms that may have one or more substituent in its chemical formula to a sample water.