US4182667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion-sensitive electrodes
Assignee: National Research Development Corp UK
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Filing: 1978-05-22
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Granted: 1980-01-08
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Expires: 1998-05-22
Abstract
Abstract Ion-sensitive electrodes are described for determining the concentration of cations of a predetermined type in electrolytes. In one such electrode a material with a high ionic mobility such as a β alumina may be used to protect material, such as a mercury amalgam, which allows interactions requiring the supply of electrons and the cations to take place internally, both materials containing cations of the predetermined type.
Inventors
- 👤 John V. Dobson
- 👤 Thomas Dickinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:06
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
171 words
An ion-sensitive electrode for determining the concentration of selected monovalent cations in an electrolyte, comprising a first member, which includes a β-alumina, for contacting an electrolyte, a second member in contact with the first member and comprising a solid mercury amalgam, means for making electrical contact with the solid mercury amalgam, and insulating means distinct from the first member, surrounding the second member and the contact means, and construted to form an elongate container shielding both the second member and the contact means from an electrolyte when the electrode is in operation allowing the first member to contact the said electrolyte, the second member being isolated from the electrolyte by being entirely enclosed by an enclosure comprising the insulating means and the first member, and both the β-alumina and the said solid mercury amalgam containing cations selected from the group consisting of Na, K, Rb, Li, Tl, Ag, Cu, NO, Cs and NH 4 , allowing the electrode to be used for determining the concentrartion of said cations in an electrolyte.
Claim 2
Dependent Claim
171 words
An ion-sensitive electrode for determining the concentration of selected monovalent cations in an electrolyte, comprising a first member, which includes a β-alumina, for contacting an electrolyte, a second member in contact with the first member and comprising a solid mercury amalgam, means for making electrical contact with the solid mercury amalgam, and insulating means distinct from the first member, surrounding the second member and the contact means, and construted to form an elongate container shielding both the second member and the contact means from an electrolyte when the electrode is in operation allowing the first member to contact the said electrolyte, the second member being isolated from the electrolyte by being entirely enclosed by an enclosure comprising the insulating means and the first member, and both the β-alumina and the said solid mercury amalgam containing cations selected from the group consisting of Na, K, Rb, Li, Tl, Ag, Cu, NO, Cs and NH 4 , allowing the electrode to be used for determining the concentrartion of said cations in an electrolyte.
Claim 3
Dependent Claim
165 words
Apparatus for determining the concentration of monovalent cations in an electrolyte, comprising an ion-sensitive electrode, a reference electrode and potential measuring means coupled between the said electrodes, wherein the ion-sensitive electrode includes: a first member comprising a β-alumina containing cations of a predetermined type and selected from the group consisting of Na, K, Rb, Li, Tl, Ag, Cu, NO, Cs and NH 4 , the β-alumina not being capable of substantial chemical reaction with at least one electrolyte, a second member, in contact with the first member comprising a solid mercury amalgam also containing said cations of a predetermined type allowing the electrode to be used for determining the concentration of said cations in an electrolyte, and means for making electrical contact with the solid mercury amalgam, the electrode being so constructed that the second member, but not the first, is isolated in operation from electrolytes, isolation being achieved by entirely enclosing the second member in an enclosure comprising the first member and insulating means.
Claim 4
Dependent Claim
165 words
Apparatus for determining the concentration of monovalent cations in an electrolyte, comprising an ion-sensitive electrode, a reference electrode and potential measuring means coupled between the said electrodes, wherein the ion-sensitive electrode includes: a first member comprising a β-alumina containing cations of a predetermined type and selected from the group consisting of Na, K, Rb, Li, Tl, Ag, Cu, NO, Cs and NH 4 , the β-alumina not being capable of substantial chemical reaction with at least one electrolyte, a second member, in contact with the first member comprising a solid mercury amalgam also containing said cations of a predetermined type allowing the electrode to be used for determining the concentration of said cations in an electrolyte, and means for making electrical contact with the solid mercury amalgam, the electrode being so constructed that the second member, but not the first, is isolated in operation from electrolytes, isolation being achieved by entirely enclosing the second member in an enclosure comprising the first member and insulating means.
References Cited (Backward Citations)
US3881955A
Cited
US3882012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-07 | 1983-07-09 | 1984-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-07 | 1987-07-09 | 1988-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-07 | 1991-07-09 | 1992-01-08 | $7700.00 | Window Closed / Lapsed |