US4269682A
Expired / Lapsed
US
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Reference electrode of insulated gate field effect transistor
Assignee: MATSUO TADAYUKI DR
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Filing: 1978-12-11
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Granted: 1981-05-26
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Expires: 1998-12-11
Abstract
Abstract A reference electrode of an insulated gate field effect transistor having the surface of the gate region thereof coated with a hydrophobic organic polymer membrane. Since this reference electrode is much smaller in size than conventional reference electrodes, an integrated measurement system can easily be constructed by using this reference electrode. This measurement system is especially effective for measuring various ions in the living body.
Inventors
- 👤 Makoto Yano
- 👤 Kiyoo Shimada
- 👤 Kyoichiro Shibatani
- 👤 Tsutomu Makimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:29
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/414; H; H10; H10P; H10P14/00; H10P14/20; H10P14/38; H10P14/3802; H10P14/3808; H10P14/34; H10P14/3402; H10P14/3404; H10P14/3411
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
100 words
A system for measuring chemical properties of substances in an electrolyte solution, comprising: a measuring unit comprising an insulated gate FET which selectively detects specific chemical substances; a reference electrode comprising an insulated gate FET whose gate region is overlayed with a membrane, said membrane consisting of a hydrophobic organic polymeric membrane material that is impermeable to the electrolyte solution, free of an ionic dissociate group and insensitive to chemical properties of the solution; a pseudo reference electrode formed of a good electrical conductor which applies bias to each FET transducer and fixes the electric potential of the electrolyte solution.
Claim 2
Independent Claim
100 words
A system for measuring chemical properties of substances in an electrolyte solution, comprising: a measuring unit comprising an insulated gate FET which selectively detects specific chemical substances; a reference electrode comprising an insulated gate FET whose gate region is overlayed with a membrane, said membrane consisting of a hydrophobic organic polymeric membrane material that is impermeable to the electrolyte solution, free of an ionic dissociate group and insensitive to chemical properties of the solution; a pseudo reference electrode formed of a good electrical conductor which applies bias to each FET transducer and fixes the electric potential of the electrolyte solution.
Claim 3
Dependent Claim
48 words
A system as set forth in claim 1 wherein said measuring unit comprises: a FET having an insulated gate region overlaid with an orgaic polymeric membrane containing a ligand capable of selectively absorbing a specific chemical substance so that the sensor is sensitive to said specific chemical substance.
Claim 4
Dependent Claim
37 words
A system as set forth in claim 1 wherein said measuring unit comprises: a FET having a gate insulating layer arranged in direct contact with the electrolyte solution to determine the pH or pNa of said solution.
Claim 5
Dependent Claim
30 words
A system as set forth in claim 1 wherein said hydrophobic organic polymeric membrane comprises: a membrane in which the degree of water content is lower than 0.5% by weight.
Claim 6
Dependent Claim
24 words
A system as set forth in claim 1, further comprising: said hydrophobic organic membrane having a thickness ranging from 500 A to 10,000 A.
Claim 7
Dependent Claim
40 words
A system as set forth in claim 1 wherein said hydrophobic organic polymeric membrane comprises: a membrane of a polymer obtained by polymerizing a monomer selected from the group consisting of mono-olefins, halogenated ethylenes, conjugated dienes and halogenated conjugated dienes.
Claim 8
Dependent Claim
40 words
A system as set forth in claim 1 wherein said hydrophobic organic polymeric membrane comprises: a membrane of a homopolymer obtained by polymerizing one monomer selected from the group consisting of mono-olefins, halogenated ethylenes, conjugated dienes and halogenated conjugated dienes.
Claim 9
Dependent Claim
41 words
A system as set forth in claim 1 wherein said hydrophobic organic polymeric membrane comprises: a membrane of copolymer obtained by polymerizing at least two members selected from the group consisting of mono-olefins, halogenated ethylenes, conjugated dienes and halogenated conjugated dienes.
Claim 10
Dependent Claim
18 words
A system as set forth in claim 8, further comprising: said mono-olefin having 2 to 5 carbon atoms.
Claim 11
Dependent Claim
13 words
A system as set forth in claim 8, wherein the mono-olefin is ethylene.
Claim 12
Dependent Claim
69 words
A system as set forth in claim 8, wherein said halogenated ethylene comprises: a compound represented by the following general formula: ##STR4## wherein X 1 , X 2 , X 3 and X 4 stand for an atom selected from the group consisting of hydrogen, chlorine and fluorine atoms with the proviso that the case where all of X 1 to X 4 stands for a hydrogen atom excluded.
Claim 13
Dependent Claim
16 words
A system as set forth in claim 8 wherein the halogenated ethylene is trifluoroethylene or tetrafluoroethylene.
Claim 14
Dependent Claim
18 words
A system as set forth in claim 8 wherein the halogenated ethylene is vinyl chloride or vinylidene chloride.
Claim 15
Dependent Claim
56 words
A system as set forth in claim 8 wherein the conjugated diene or halogenated conjugated diene is a compound represented by the following general formula: ##STR5## wherein Y 1 to Y 6 stand for a member selected from the group consisting of hydrogen, chlorine and fluorine atoms and alkyl groups having 1 to 3 carbon atoms.
Claim 16
Dependent Claim
21 words
A measuring system as set forth in claim 14, wherein the conjugated diene or halogenated conjugated diene is butadiene or hexachlorobutadiene.
Claim 17
Dependent Claim
71 words
A system as set forth in claim 1, wherein said hydrophobic organic polymeric membrane comprises: a membrane of a polysiloxane represented by the following general formula: ##STR6## wherein Z 1 and Z 2 stand for an alkyl or aryl group having 1 to 10 carbon atoms, in which one or more of the carbon atoms may have a halogen or cyano substituent, and n is a number of at least 100.
Claim 18
Dependent Claim
15 words
A system as set forth in claim 16, wherein the polysiloxane is polydimethylsiloxane or polyphenylsiloxane.
Claim 19
Dependent Claim
28 words
A system as set forth in claim 1, further comprising: said measuring unit, said reference electrode and said pseudo reference electrode being formed on a common silicon wafer.
References Cited (Backward Citations)
US3591482A
Cited
US3831432A
Cited
US3856649A
Cited
US4020830A
Cited
US4020830B1
Cited
US4133735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |