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:
Nov. 02, 1999
Filed:
Feb. 23, 1999
Wen H Wu, Elkhart, IN (US);
Integrated Biomedical Technology, Inc., Elkhart, IN (US);
Abstract
A composition, method, and test device for determining a low concentration of total available chlorine concentration in a test sample are disclosed. The test device includes a test pad having a suitable carrier matrix incorporating an indicator reagent composition capable of converting combined available chlorine to free available chlorine and of interacting with free available chlorine to produce a detectable and measurable response for total available chlorine over a range of 0 to about 2 ppm total available chlorine in the test sample. An indicator reagent composition contains: (a) an indicator dye that is responsive to free available chlorine, such as tetramethylbenzidine, (b) a buffer, (c) an optional surfactant, (d) a catalyst, and (e) a polymer. An indicator reagent composition is incorporated into a carrier matrix, like filter paper, to provide a test pad useful in a dry phase total available chlorine assay of a test sample, such as a source water for a hemodialysis unit.