US5139626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion concentration measurement method
Assignee: Terumo Corp
•
Filing: 1990-10-31
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Granted: 1992-08-18
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Expires: 2010-10-31
Abstract
Abstract An electrochemical cell is formed by immersing an electrochemical ion sensor and a reference electrode into a solution of interest, the electrochemical ion sensor exhibiting ion selectivity with respect to an ion of interest and having a high electrode resistance. A current which flows through the electrochemical cell is measured while the potential of the electrochemical ion sensor is held to a constant potential with respect to the reference electrode. The current so obtained are proportional to the logarithm value of the concentration of the ion.
Inventors
- 👤 Shuichiro Yamaguchi
- 👤 Takeshi Shimomura
- 👤 Norihiko Ushizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:54
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/48; G01N27/403; G01N27/4035
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
148 words
A method of measuring ionic concentration comprising the steps of: forming an electrochemical cell by immersing an electrochemical ion sensor having a resistivity of more than 10 3 Ω/cm 2 and a reference electrode into a solution of interest; measuring a current which flows through said electrochemical cell while the electrochemical ion sensor is held at a constant potential with respect to the reference electrode; and determining ionic concentration value from the measured current on the basis of proportional relation between the measured current and the logarithm of the ionic concentration; said electrochemical ion sensor comprising an electrically conductive substrate, an electrolytically polymerized redox polymer layer fixing a material capable of undergoing a quinone-hydroquinone type redox reaction coating a surface of said electrically conductive substrate, and an ion selective layer exhibiting ion selectivity which is carried on a polymeric compound coating a surface of said redox polymer layer.
Claim 2
Independent Claim
148 words
A method of measuring ionic concentration comprising the steps of: forming an electrochemical cell by immersing an electrochemical ion sensor having a resistivity of more than 10 3 Ω/cm 2 and a reference electrode into a solution of interest; measuring a current which flows through said electrochemical cell while the electrochemical ion sensor is held at a constant potential with respect to the reference electrode; and determining ionic concentration value from the measured current on the basis of proportional relation between the measured current and the logarithm of the ionic concentration; said electrochemical ion sensor comprising an electrically conductive substrate, an electrolytically polymerized redox polymer layer fixing a material capable of undergoing a quinone-hydroquinone type redox reaction coating a surface of said electrically conductive substrate, and an ion selective layer exhibiting ion selectivity which is carried on a polymeric compound coating a surface of said redox polymer layer.
Claim 3
Independent Claim
149 words
A method of measuring ionic concentration comprising the steps of: forming an electrochemical cell by immersing an electrochemical ion sensor having a resistivity of more than 10 3 Ω/cm 2 and a reference electrode into a solution of interest; measuring a current which flows through said electrochemical cell while the electrochemical ion sensor is held at a constant potential with respect to the reference electrode; and determining ionic concentration value from the measured current on the basis of the proportional relation between the measured current and the logarithm of the ionic concentration; said electrochemical ion sensor comprising an electrically conductive substrate, an electrolytically polymerized redox polymer layer fixing a material capable of undergoing an amine-quinoid type redox reaction coating a surface of said electrically conductive substrate, and an ion selective layer exhibiting ion selectivity which is carried on a polymeric compound coating a surface of said redox polymer layer.
Claim 4
Independent Claim
149 words
A method of measuring ionic concentration comprising the steps of: forming an electrochemical cell by immersing an electrochemical ion sensor having a resistivity of more than 10 3 Ω/cm 2 and a reference electrode into a solution of interest; measuring a current which flows through said electrochemical cell while the electrochemical ion sensor is held at a constant potential with respect to the reference electrode; and determining ionic concentration value from the measured current on the basis of the proportional relation between the measured current and the logarithm of the ionic concentration; said electrochemical ion sensor comprising an electrically conductive substrate, an electrolytically polymerized redox polymer layer fixing a material capable of undergoing an amine-quinoid type redox reaction coating a surface of said electrically conductive substrate, and an ion selective layer exhibiting ion selectivity which is carried on a polymeric compound coating a surface of said redox polymer layer.
Claim 5
Independent Claim
149 words
A method of measuring ionic concentration comprising the steps of: forming an electrochemical cell by immersing an electrochemical ion sensor having a resistivity of more than 10 3 Ω/cm 2 and a reference electrode into a solution of interest; measuring a current which flows through said electrochemical cell while the electrochemical ion sensor is held at a constant potential with respect to the reference electrode; and determining ionic concentration value from the measured current on the basis of proportional relation between the measured current and the logarithm of the ionic concentration; said electrochemical ion sensor comprising an electrically conductive substrate, an electrolytically polymerized redox polymer layer fixing a member selected from the group consisting of poly(pyrrole) and poly(thionylene) coating a surface of said electrically conductive substrate, and an ion selective layer exhibiting ion selectivity which is carried on a polymeric compound coating a surface of said redox polymer layer.
Claim 6
Independent Claim
149 words
A method of measuring ionic concentration comprising the steps of: forming an electrochemical cell by immersing an electrochemical ion sensor having a resistivity of more than 10 3 Ω/cm 2 and a reference electrode into a solution of interest; measuring a current which flows through said electrochemical cell while the electrochemical ion sensor is held at a constant potential with respect to the reference electrode; and determining ionic concentration value from the measured current on the basis of proportional relation between the measured current and the logarithm of the ionic concentration; said electrochemical ion sensor comprising an electrically conductive substrate, an electrolytically polymerized redox polymer layer fixing a member selected from the group consisting of poly(pyrrole) and poly(thionylene) coating a surface of said electrically conductive substrate, and an ion selective layer exhibiting ion selectivity which is carried on a polymeric compound coating a surface of said redox polymer layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-18 | 1996-02-17 | 1996-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-18 | 2000-02-17 | 2000-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-18 | 2004-02-17 | 2004-08-18 | $7700.00 | Window Closed / Lapsed |