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:
Mar. 17, 1987
Filed:
Feb. 01, 1985
Sally E Cahill, Union, MI (US);
Melvin D Smith, Wakarusa, IN (US);
Miles Laboratories, Inc., Elkhart, IN (US);
Abstract
A stable test device capable of manufacture by automated methods for the determination of chloride in an aqueous fluid sample. The test device operates by controlled diffusion of the aqueous sample into a porous matrix. The matrix is incorporated with sodium carrageenan and silver salts capable of dissolving in an aqueous fluid containing chloride, at least part of which silver salts is silver chromate. Devices prepared with the inclusion of sodium carrageenan provide a chloride test device with approximately double the shelf life under room temperature storage conditions of previous test devices prepared without sodium carrageenan. The stable test device provides useful information in less than about 2 minutes after the sample contacts the matrix. The chloride concentration of the sample is determined by comparing the pattern of silver chromate remaining after sample contact to an appropriate pattern chart.