04020830 is referenced by 188 patents and cites 8 patents.

A chemical sensitive field-effect transistor transducer capable of selectively detecting and measuring chemical properties of substances to which the transducer is exposed. The transducer includes a semiconductor substrate material having a certain doping polarity, a pair of spaced apart diffusion regions located at the surface of the substrate material and having a doping polarity opposite that of the substrate material, electrical insulator material overlying the diffusion regions and the surface of the substrate material lying between the diffusion regions, and a chemical selective system overlying the insulator material. The chemical selective system is adapted to interact with certain substances and thereby modulate an electric field produced in the substrate material between the diffusion regions. This modulation is dependent upon the chemical properties of the substances and provides a measure of those chemical properties. The chemical selective system may include various structures for measuring ion activity, immunochemical concentrations, reducible gas concentrations and the concentrations of enzymes and substrates.

Title
Selective chemical sensitive FET transducers
Application Number
5/557545
Publication Number
4020830
Application Date
March 12, 1975
Publication Date
May 3, 1977
Inventor
Jiri A Janata
Salt Lake City
UT, US
Stanley D Moss
Kaysville
UT, US
Curtis C Johnson
Sandy
UT, US
Agent
Criddle Thorpe & Western
Assignee
The University of Utah
UT, US
IPC
G01N 31/14
G01N 27/46
A61B 5/05
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