Selective chemical sensitive FET transducers
Patent 4020830 Issued on May 3, 1977. Estimated Expiration Date: 
May 3, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 3, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3049118 3294988 3649505 3776819 3787309 3831432 3896008 Calcium electrode and membrane and composition for use therein Patent #: 3932233 InventorsApplicationNo. 05/557545 filed on 03/12/1975US Classes:600/348, Determining ion concentration/partial pressure204/403.1, Enzyme included in apparatus204/403.11, Glucose oxidase204/412, Three or more electrodes204/414, Gel electrolyte204/415, Selectively permeable membrane204/418, Organic membrane204/425, With impressed current means204/426, Planar electrode surface257/253, Chemical (e.g., ISFET, CHEMFET)257/414, RESPONSIVE TO NON-ELECTRICAL SIGNAL (E.G., CHEMICAL, STRESS, LIGHT, OR MAGNETIC FIELD SENSORS)257/635, Multiple layers324/425, ELECTROLYTE PROPERTIES435/287.9, Including a coated reagent or sample layer438/1, HAVING BIOMATERIAL COMPONENT OR INTEGRATED WITH LIVING ORGANISM438/49Chemically responsiveExaminersPrimary: Kaplan, G. L.Attorney, Agent or FirmAbstractA 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.Other References
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