A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
349/56, 356/73
A61B 5/05 (2006.01) A61B 5/00 (2006.01) C12Q 1/00 (2006.01) G01N 27/414 (2006.01) G01N 31/00 (2006.01) G01N 33/543 (2006.01) H01L 29/00 (2006.01) H01L 29/76 (2006.01) G01N 35/10 (2006.01)
Patent
CA 1059645
Abstract of the Disclosure A field effect transistor transducer is disclosed in connection with the detection or measurement of chemical properties such as ion activity and concentration and the presence and concentration of any of a variety of chemical and biochemical substances. The transducer has a semi-conductor substrate with a particular doping polarity and a pair of spaced apart dif- fusion regions on the surface of the substrate, the doping polarity of the diffusion regions being opposite that of the substrate material. Electrical insulating material overlies the diffusion regions and the portion of the substrate material between the diffusion regions. A chemical selective system, for example a membrane of polyvinyl chloride, overlies the insulating mater- ial. The chemical selective system interacts with certain substances to which it is exposed to modulate an electric field produced in the substrate between the diffusion regions according to the chemical properties of the substance.
247781
Janata Jiri
Johnson Curtis C.
Moss Stanley D.
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