3607093 is referenced by 54 patents and cites 4 patents.

Testing devices for biological liquids comprise liquid permeable membranes of uniform chemical composition having a solid diagnostic reagent composition incorporated in at least a portion thereof and having at least one surface portion impenetrable by particles of the order of size of red blood corpuscles. The membranes may be of substantially uniform porosity throughout or they may have a thin skin portion of low effective porosity and a thicker body portion having pores of substantially large effective diameters.

Title
Devices for testing biological liquids
Application Number
04/705,603
Publication Number
3607093
Application Date
February 15, 1968
Publication Date
September 21, 1971
Inventor
Stone Ellery W
Assignee
Schering Corporation
IPC
G01n 33/16
G01n 31/14
C12k 01/04
G01N 33/52
B01D 61/38
C12Q 01/54
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