US4471296A
Expired / Lapsed
US
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Measuring oxygen concentration
Assignee: Westinghouse Electric Corp
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Filing: 1981-11-24
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Granted: 1984-09-11
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Expires: 2001-11-24
Abstract
Abstract Disclosed is a device and a method for measuring the partial pressure of oxidizing species in a liquid. A metal or incompletely oxidized metal oxide which is susceptible to anodic oxidation and which forms an oxide having a Pilling-Bedworth ratio greater than one is placed in the liquid. The oxide formed on the metal is confined and the pressure of the confined oxide is measured. That pressure is a known function of the concentration of oxidizing species in the liquid. The device is calibrated in liquids of known oxygen content to establish the relationship between oxide content and pressure.
Inventors
- 👤 Svend B. Dalgaard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:19
CPC Classifications
G; G01; G01N; G01N7/00; G01N7/14; G01N7/18
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
73 words
A device for measuring the partial pressure of oxidizing species in a liquid comprising (1) a substance which is susceptible to anodic oxidation and which forms an oxide having a Pilling-Bedworth ratio greater than 1, selected from the group consisting of metals, incompletely oxidized metal oxides, and mixtures thereof; (2) means for confining said oxide as it is formed on said substance; and (3) means for measuring the pressure of said confined oxide.
Claim 2
Independent Claim
73 words
A device for measuring the partial pressure of oxidizing species in a liquid comprising (1) a substance which is susceptible to anodic oxidation and which forms an oxide having a Pilling-Bedworth ratio greater than 1, selected from the group consisting of metals, incompletely oxidized metal oxides, and mixtures thereof; (2) means for confining said oxide as it is formed on said substance; and (3) means for measuring the pressure of said confined oxide.
Claim 3
Dependent Claim
12 words
A device according to claim 1 wherein said substance is a metal.
Claim 4
Dependent Claim
23 words
A device according to claim 2 wherein said metal is selected from the group consisting of iron, alloys of iron, and mixtures thereof.
Claim 5
Dependent Claim
23 words
A device according to claim 2 wherein said metal is selected from the group consisting of copper, nickel, alloys thereof, and mixtures thereof.
Claim 6
Dependent Claim
19 words
A device according to claim 2 wherein said means for confining said oxide is a space within said metal.
Claim 7
Dependent Claim
36 words
A device according to claim 2 wherein said means for confining said oxide is an inert, inflexible clamp which confines said oxide between said metal and said means for measuring the pressure of said confined oxide.
Claim 8
Dependent Claim
11 words
A device according to claim 1 wherein said liquid is water.
Claim 9
Dependent Claim
15 words
A device according to claim 1 wherein said means for measuring pressure is a semiconductor.
Claim 10
Independent Claim
152 words
A method of measuring the oxygen content of a liquid having unknown oxygen content comprising (1) placing into samples of said liquid having known oxygen contents a device which comprises; (a) a substance which is susceptible to anodic oxidation and which forms an oxide having a Pilling-Bedworth ratio greater than 1, selected from the group consisting of metals, incompletely oxidized metal oxides, and mixtures thereof; (b) means for confining said oxide as it is formed on said substance; and (c) means for measuring the pressure of said confined oxide; (2) measuring the pressure of said confined oxide at said oxygen contents to obtain a relationship between said pressure and said oxygen content; (3) placing said device or an identically constructed device in said liquid of unknown oxygen content; (4) measuring the pressure of said confined oxide in said liquid; (5) matching said pressure with oxygen content according to said previously determined relationship.
Claim 11
Independent Claim
152 words
A method of measuring the oxygen content of a liquid having unknown oxygen content comprising (1) placing into samples of said liquid having known oxygen contents a device which comprises; (a) a substance which is susceptible to anodic oxidation and which forms an oxide having a Pilling-Bedworth ratio greater than 1, selected from the group consisting of metals, incompletely oxidized metal oxides, and mixtures thereof; (b) means for confining said oxide as it is formed on said substance; and (c) means for measuring the pressure of said confined oxide; (2) measuring the pressure of said confined oxide at said oxygen contents to obtain a relationship between said pressure and said oxygen content; (3) placing said device or an identically constructed device in said liquid of unknown oxygen content; (4) measuring the pressure of said confined oxide in said liquid; (5) matching said pressure with oxygen content according to said previously determined relationship.
Claim 12
Independent Claim
74 words
A method of measuring the oxygen content of a liquid having unknown oxygen content comprising (1) placing in a liquid a substance which is susceptible to anodic oxidation and which forms an oxide having a Pilling-Bedworth ratio greater than 1, selected from the group consisting of metals, incompletely oxidized metals oxides, and mixtures thereof; (2) confining said oxide as it is formed on said substance and (3) measuring the pressure of said confined oxide.
Claim 13
Independent Claim
74 words
A method of measuring the oxygen content of a liquid having unknown oxygen content comprising (1) placing in a liquid a substance which is susceptible to anodic oxidation and which forms an oxide having a Pilling-Bedworth ratio greater than 1, selected from the group consisting of metals, incompletely oxidized metals oxides, and mixtures thereof; (2) confining said oxide as it is formed on said substance and (3) measuring the pressure of said confined oxide.
References Cited (Backward Citations)
US3253219A
Cited
US4180771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |