TEST FOR A GIVEN CONSTITUENT IN A LIQUID

• US 3,847,553 A
• Filed: 06/23/1972
• Issued: 11/12/1974
• Est. Priority Date: 07/28/1970
• Status: Expired due to Term

• Current Assignee: Bruno J. Verbeck
• Original Assignee: Bruno J. Verbeck
• Inventors: Verbeck, Bruno J.
• Primary Examiner(s): Scovronek, Joseph
• Application Number:
  US05/265,645
• Time in Patent Office: 872 Days
• Field of Search: 23/253TP,23B 195/95,13.5R,13.5C,127
• US Class Current: 422/420
• CPC Class Codes: G01N 33/525 Multi-layer analytical elements
• CPC Class Codes: G01N 33/6839 involving dyes, e.g. Coomassie blue, bromcresol green
• CPC Class Codes: Y10S 435/805 Test papers

Abstract

A device for determining the presence of a constituent in a liquid comprising a carrier having secured to a part of one surface a mixture of particulate material which comprises (a) particulate material prepared by impregnating hydrophilic absorptive material with a solution of an indicator which changes color in the presence of a reaction product formed when the aforesaid constituent is contacted with a composition which reacts with the said constituent, and then drying, and (b) particulate material prepared by impregnating hydrophilic absorptive material with a solution comprising said composition and then drying.

Claims

1. A TESTING DEVICE FOR DETERMINING THE PRESENCE OF A CONSITUTENT IN A LIQUID, COMPRISING A CARRIER HAVING UNIFORMLY APPLIED OVER AT LEAST A PORTION OF ONE SURFACE THEREOF A LAYER OF PARTICULATE HYDROPHILIC ABSORPTIVE MATERIAL IN THE FORM OF AGGLOMERATES WHICH HAVE BEEN FORMED BY FIRST COMPRESSING INTO A COMPACTED FORM A MIXTURE OF (A) PARTICULATE MATERIAL WHICH HAS BEEN PREPARED BY FIRST IMPREGNATING ONE PORTION OF PARTICULATE HYDROPHILIC ABSORPTIVE MATERIAL WITH A SOLUTION OF AN INDICATOR MATERIAL WHICH UNDERGOES A COLOR CHANGE IN RESPONSE TO THE PRESENCE OF A REACTION PRODUCT FORMED WHEN SUCH CONSTITUENT IS CONTACTED WITH A COMPOSITION WHICH REACTS WITH SAID CONSTITUENT, AND THEN DRYING, AND (B) PARTICULATE MATERIAL WHICH HAS BEEN PREPARED BY FIRST IMPREGNATING A SECOND PORTION OF PARTICULATE HYDROPHILIC ABSORPTIVE MATERIAL WITH A SOLUTION COMPRISING SAID COMPOSITION, AND THEN DRYING AND THEN PARTICULATING SAID COMPACTED FROM TO FORM AGGLOMERATES COMPRISING THE TWO KINDS OF DISCRETE PARTICLES OF HYDROPHILIC ABSORPTIVE MATERIAL AND THE PRODUCT WITH WHICH SAID PARTICLES HAVE BEEN IMPREGNATED.

2. A testing device for determining the presence of a constituent in a liquid, comprising a laminate form of (a) a first hydrophilic sheet having a thickness of hydrophilic absorbent particles adhesively secured to a surface thereof, said particles having been prepared by first impregnating hydrophilic absorbent particulate material with a solution of an indicator material which undergoes a color change in response to the presence of a reaction product formed when said constituent is contacted with a composition which reacts with said constituent and then drying, and (b) a second hydrophilic sheet adhesively secured to said first sheet, said second sheet having a thickness of hydrophilic absorbent particles adhesively secured to a surface thereof, said particles having been prepared by first impregnating hydrophilic absorbent particulate material with a solution comprising said composition, and then drying.

3. A testing device for determining the presence of a constituent in a liquid, comprising a carrier having secured to a portion of one surface thereof a mixture of particulate material in compacted form comprising (a) particulate material which has been prepared by impregnating one portion of particulate hydrophilic absorptive material with a solution of an indicator material which undergoes a color change in response to the presence of a reaction product formed when said constituent is contacted with a composition which reacts with said constituent, and then drying, and (b) particulate material which has been prepared by impregnating particulate hydrophilic absorptive material with a solution comprising said composition, and then drying.