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US4874501A Expired / Lapsed US ⏱️ 0.0 years remaining

Membrane for an electrochemical measuring electrode device

Assignee: Radiometer AS
•
Filing: 1988-06-29
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Granted: 1989-10-17
•
Expires: 2008-06-29
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Abstract

Abstract An electrochemical measuring electrode device (10) for polarographically measuring the partial pressure of oxygen in an electrolytic medium comprises a cathode (14) which is capable of reducing oxygen and defines an exposed oxygen-reducing cathode surface (20), an anode (18), which defines an exposed anode surface which is arranged relative to the exposed oxygen-reducing cathode surface so as to communicate electrolytically therewith through the electrolytic medium, and a membrane (24), which covers the exposed oxygen-reducing cathode surface and further defines an electrolyte chamber (22) in which the electrolytic medium is confined. In order to effectively promote the decomposition H<sub>2</sub>0<sub>2</sub> generated in the electrolytic medium as an oxygen reduction intermediate and thereby reduce the response time of the electrode, a stable, non-biological catalytic means is provided catalytically communicating with the H<sub>2</sub>0<sub>2</sub>. The stable, non-biological catalytic means is preferably constituted by platinum black particles which may be received by the membrane at a central region (42) thereof or alternatively be received by a support structure which may further constitute a covering of at least part of the membrane (24).The platinum black particles may be pressed into a foil material constituting a base material of the membrane or alternatively be applied in a suspension to the membrane whereupon the suspension is solidifyed.

Inventors

  • 👤 Torben F. Christiansen
  • 👤 Finn Kokholm

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 18:10
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404

Claims Analysis

Total Claims: 14
Claim 1
Independent Claim 89 words
A membrane for an electrochemical measuring electrode device for polarographically measuring the partial pressure of oxygen in a medium, said membrane being a foil-shaped plastic material permeable to oxygen and being provided with a coating on at least part of the surface of said membrane, said coating comprising a particulate non-silver noble metal catalytic means effective for promoting the decomposition of H 2 O 2 , the non-silver noble metal particles of the catalytic means being substantially constituted by particles having a cross-sectional area of less than 1 μm.
Claim 2
Dependent Claim 89 words
A membrane for an electrochemical measuring electrode device for polarographically measuring the partial pressure of oxygen in a medium, said membrane being a foil-shaped plastic material permeable to oxygen and being provided with a coating on at least part of the surface of said membrane, said coating comprising a particulate non-silver noble metal catalytic means effective for promoting the decomposition of H 2 O 2 , the non-silver noble metal particles of the catalytic means being substantially constituted by particles having a cross-sectional area of less than 1 μm.
Claim 3
Dependent Claim 21 words
A membrane according to claim 1, in which the catalytic means comprises a solid catalytic means comprising a platinum group metal.
Claim 4
Dependent Claim 16 words
A membrane according to claim 2, in which the catalytic means comprises a platinum black means.
Claim 5
Dependent Claim 22 words
A membrane according to claim 3, in which the platinum black means is constituted by platinum black particles received by the membrane.
Claim 6
Dependent Claim 54 words
A membrane according to claim 3, in which the platinum black means is constituted by platinum black particles, said platinum black particles being received by a support structure permeable to H 2 O 2 , oxygen and water, said support structure constituting a covering of at least part of a surface of said membrane.
Claim 7
Dependent Claim 42 words
A membrane according to claim 1, in which the coating comprising the catalytic means is arranged on a first side surface of said membrane, said first side surface being adapted to face the front measuring surface of said electrochemical measuring electrode device.
Claim 8
Dependent Claim 23 words
A membrane according to claim 1, in which said platinum black particles are present in a surface density of 1-6000 μg/cm 2 .
Claim 9
Dependent Claim 23 words
A membrane according to claim 7, in which said platinum black particules are present in a surface density of 20-600 μg/cm 2 .
Claim 10
Dependent Claim 101 words
A membrane for an electrochemical measuring electrode device for polarographically measuring the partial pressure of oxygen in a medium, said membrane being a foil-shaped plastic material permeable to oxygen and being provided with a coating on at least part of the surface of said membrane, said coating comprising a particulate non-silver noble metal catalytic means effective for promoting the decomposition of H 2 O 2 , said catalytic means being embedded in a support structure permeable to H 2 O 2 , oxygen and water, said support structure constituting a covering of at least part of a surface of said membrane.
Claim 11
Dependent Claim 101 words
A membrane for an electrochemical measuring electrode device for polarographically measuring the partial pressure of oxygen in a medium, said membrane being a foil-shaped plastic material permeable to oxygen and being provided with a coating on at least part of the surface of said membrane, said coating comprising a particulate non-silver noble metal catalytic means effective for promoting the decomposition of H 2 O 2 , said catalytic means being embedded in a support structure permeable to H 2 O 2 , oxygen and water, said support structure constituting a covering of at least part of a surface of said membrane.
Claim 12
Dependent Claim 21 words
A membrane according to claim 9, in which the catalytic means comprises a solid catalytic means comprising a platinum group metal.
Claim 13
Dependent Claim 16 words
A membrane according to claim 10, in which the catalytic means comprises a platinum black means.
Claim 14
Dependent Claim 18 words
A membrance according to claim 11, in which the platinum black means is constituted by platinum black particles.

References Cited (Backward Citations)

US4051006A Cited
US4073698A Cited
US4201634A Cited
DE2936142A1 Cited
US4326927A Cited
JPS5746154A Cited
US4394239A Cited
EP0047898B1 Cited
JPS593345A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-10-16 1993-04-17 1993-10-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-10-16 1997-04-17 1997-10-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-10-16 2001-04-17 2001-10-17 $7700.00 Window Closed / Lapsed

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