Test for a given constituent in a liquid

• US 3,993,451 A
• Filed: 11/08/1974
• Issued: 11/23/1976
• Est. Priority Date: 07/28/1970
• Status: Expired due to Term

• Current Assignee: Miles Laboratories, Inc. (Bayer AG)
• Original Assignee: Miles Laboratories, Inc. (Bayer AG)
• Inventors: Verbeck, Bruno J.
• Primary Examiner(s): Scovronek, Joseph
• Application Number:
  US05/521,971
• Time in Patent Office: 746 Days
• Field of Search: 23/253 TP, 23/230 B, 195/95, 195/103.5 R, 195/103.5 C, 195/127
• US Class Current: 422/428
• CPC Class Codes: G01N 33/525 Multi-layer analytical elements
• CPC Class Codes: Y10S 435/805 Test papers

Abstract

The device, for use in analysis of a sample of liquid material applied thereto, comprises a plastic film support having adhered to one surface thereof a reagent-containing layer, said reagent reacting with a component of said sample to produce a color change within said layer, said layer also containing reagent-free particles of hydrophilic, absorbent, porous, particulate material, adhered to said surface, and on the opposite side of said reagent-containing layer from said support, a layer of a porous medium through which some of the said component is transmitted to said reagent-containing layer.

Claims

1. A multi-layer testing device for use in analysis of a sample of liquid material applied thereto, comprising a plastic film support having adhered to one surface thereof a reagent-containing layer, said reagent reacting with a component of said sample to produce a color change within said layer, said layer also containing reagent-free particles of hydrophilic, particulate material adhered to said surface, and on the opposite side of said reagent-containing layer from said support, a layer of a porous medium through which some of the said component is transmitted to said reagent-containing layer.

2. The device of claim 1 wherein said reagent-free particles of hydrophilic, particulate material comprise a member selected from the group consisting of aluminum oxide, silica gel, powdered cellulose and exfoliated vermiculite.