04900663 is referenced by 47 patents and cites 6 patents.

A test card incorporates a colorimetric indicator test to determine the presence of a minute amount of a specific substance in a liquid medium. The test card includes top and bottom sheets adhesively secured to an intermediate frame member which, together with the top and bottom sheets, defines a filter chamber having a flat filter therein which incorporates a test portion. The test portion of the filter has a binding substrate to which antibodies of the specific substance have been bound. This binding substrate is in communication with a test port. In the method of the invention a substance to be tested is administered through the test port and contains an unknown amount of antigen. After the sample is administered an aqueous solution of enzyme labelled antigen is administered and, subsequently, a liquid substrate is added to cause a color change in the filter below the test portion inversely proportional to the amount of antigen contained in the sample administered at the test port.

Title
Test kit for determining the presence of organic materials and method of utilizing same
Application Number
6/775991
Publication Number
4900663
Application Date
September 13, 1985
Publication Date
February 13, 1990
Inventor
Roy A Chung
Fountain Valley
CA, US
Arden A Kelton
Fountain Valley
CA, US
Siong I Wie
Irvine
CA, US
Agent
Sigalos Levine & Montgomery
Assignee
Environmental Diagnostics
NC, US
IPC
G01H 33/558
G01H 33/543
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