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:
Jan. 17, 2017
Filed:
Jun. 20, 2014
Hach Company, Loveland, CO (US);
Ibrahim A. Ismail, Osceola, IN (US);
Matthew Hertel, Granger, IN (US);
Teresa Lynn Swanson, Elkhart, IN (US);
Hach Company, Loveland, CO (US);
Abstract
A test element () used to determine concentration levels of free and total chlorine in a water sample comprises a test pad () adhered to a substrate (), wherein the test pad () is impregnated with a stabilized DPD solution. The test pad () is color responsive to different concentration levels of chlorine in the water and compared to a color chart to determine the level of free chlorine and/or total chlorine in the water. The stabilized DPD solution may include N,N-diethyl-p-phenylenediamine oxalate salt, a polymeric anhydride such as a methyl-vinyl anhydride and an organo-sulfate such as dimethylsulfone.