US4263115A
Expired / Lapsed
US
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Ion-selective electrode device for polarographic measurement of oxygen
Assignee: Max-Planck-Gesellschaft zur Förderung der Wissenschaften eV
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Filing: 1978-07-03
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Granted: 1981-04-21
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Expires: 1998-07-03
Abstract
Abstract An ion-selective electrode device for measuring oxygen concentrations comprises a noble metal reduction electrode connected to a voltage source; a reference electrode connected to said reduction electrode; an ion-selective carrier or ligand membrane disposed in front of the reduction electrode and containing a cation-selective ligand and being permeable to hydrogen ion; a closure membrane to seal the device against the outside atmosphere, the said closure membrane being permeable to oxygen and impermeable to water, and an electroyte containing the ligand cation of said ligand membrane, the said electrolyte being disposed between the said ligand membrane and said closure membrane.
Inventors
- 👤 Manfred Kessler
- 👤 Jens Hoper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:30
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404; G01N27/416; G01N27/48
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
113 words
An ion-selective electrode device for measuring oxygen concentrations comprising a source of potential voltage; a reduction electrode for the oxygen composed of a noble metal and connected to said voltage source; a reference electrode annularly disposed about said reduction electrode; a ligand membrane provided in front of the reduction electrode, the said ligand membrane containing a cation-selective carrier and being permeable to hydrogen ions; a closure membrane to seal the said electrodes against the outside space, the closure membrane being permeable to oxygen and impermeable to water, and an aqueous electrolyte containing the ligand cation of the said ligand membrane, the said electrolyte being disposed between said ligand membrane and said closure membrane.
Claim 2
Dependent Claim
113 words
An ion-selective electrode device for measuring oxygen concentrations comprising a source of potential voltage; a reduction electrode for the oxygen composed of a noble metal and connected to said voltage source; a reference electrode annularly disposed about said reduction electrode; a ligand membrane provided in front of the reduction electrode, the said ligand membrane containing a cation-selective carrier and being permeable to hydrogen ions; a closure membrane to seal the said electrodes against the outside space, the closure membrane being permeable to oxygen and impermeable to water, and an aqueous electrolyte containing the ligand cation of the said ligand membrane, the said electrolyte being disposed between said ligand membrane and said closure membrane.
Claim 3
Dependent Claim
18 words
The device of claim 1 in which said ligand membrane is a solvent-impregnated PVC containing said ion-selective ligand.
Claim 4
Dependent Claim
23 words
The device of claim 2 in which the ion-selective ligand of the ligand membrane is Na + selective and the solvent is dibenzylether.
Claim 5
Dependent Claim
24 words
The device of claim 2 in which the said ion selective cation ligand is K + selective and the solvent is (bis- (2-ethylhexyl) phthalate).
Claim 6
Dependent Claim
26 words
The device of claim 1 in which the cation selective ligand is a molecule selected from the group consisting of N,N,N,N-tetrabenzyl-3,6-dioxaoctane diamide, N,N'-dibenzyl-N,N'-diphenyl-1,2-phenylenedioxydiacetamide, 3,6-dioxaoctanediacid-bis-diphenylamine, and valinomycin.
Claim 7
Dependent Claim
46 words
The device of claim 1 in which the electrolyte consists of 0.1 M HCl and 0.01 M NaCl if the ligand membrane is Na + sensitive and contains 0.1 M HCl and 0.01 M KCl if the reference electrode membrane contains a K + sensitive molecule.
Claim 8
Dependent Claim
28 words
The device of claim 1 which includes an amplifier for indicating the measurement produced by the device, the said amplifier having an input resistance of 10 12 Ω.
Claim 9
Dependent Claim
13 words
The device of claim 1 wherein the reduction electrode is composed of platinum.
Claim 10
Dependent Claim
13 words
The device of claim 1 wherein the closure membrane is of polymerized tetrafluoroethylene.
Claim 11
Dependent Claim
62 words
The device of claim 1, which includes a reference membrane disposed in front of the reference electrode and containing a ligand different from the cation ligand of said ligand membrane, and wherein said electrolyte is in contact with said ligand membrane and said closure membrane and contains the ligand of the reference membrane in addition to the ligand of the ligand membrane.
Claim 12
Dependent Claim
40 words
The device of claim 10, wherein the ion of the ligand membrane is Na + and the ion of the reference membrane is K + or reverse and wherein the electrolyte contains both the Na + and K + ions.
Claim 13
Dependent Claim
17 words
The device of claim 10 wherein the reference electrode is arranged in ring-shape around said reduction electrode.
References Cited (Backward Citations)
US3957607A
Cited
US3857777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |