US5217588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for sensing NOx
Assignee: Verizon Laboratories Inc
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Filing: 1992-02-27
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Granted: 1993-06-08
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Expires: 2012-02-27
Abstract
Abstract Apparatus and method for determining the concentration of NOx in a gas mixture. The gas mixture is supplied to two electrodes at which different NOx decomposition conditions are present. The electrodes may be of different materials or sizes or may be positioned in different gas enclosure environments. The NOx decomposes at different rates at the two electrodes and an emf is thus produced between the electrodes. The concentration of NOx in the gas mixture is determined from the measured emf.
Inventors
- 👤 Da Y. Wang
- 👤 Daniel T. Kennedy
- 👤 Burton W. MacAllister, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:46
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4073; G01N27/4074; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01N33/0036; G01N33/0037; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
63 words
The method of determining the concentration of NOx in a gas comprising providing an electrolyte sensor having a first electrode and a second electrode with different NOx decomposition conditions present at each electrode; exposing both electrodes to a test gas; measuring the electrical differential between the two electrodes; and determining the concentration of NOx in the test gas from the measured electrical differential.
Claim 2
Independent Claim
63 words
The method of determining the concentration of NOx in a gas comprising providing an electrolyte sensor having a first electrode and a second electrode with different NOx decomposition conditions present at each electrode; exposing both electrodes to a test gas; measuring the electrical differential between the two electrodes; and determining the concentration of NOx in the test gas from the measured electrical differential.
Claim 3
Dependent Claim
17 words
The method in accordance with claim 1 wherein said first and second electrodes are of different sizes.
Claim 4
Dependent Claim
21 words
The method in accordance with claim 1 wherein said first and second electrodes are of materials having different NOx decomposition properties.
Claim 5
Independent Claim
77 words
The method of determining the concentration of NOx in a gas comprising providing an electrolyte sensor having two different gas enclosure environments with a first electrode in one environment and a second electrode in the other environment; introducing a test gas to both gas enclosure environments and exposing both electrodes to the test gas; measuring the potential differential between the two electrodes; and determining the concentration of NOx in the test gas from the measured potential differential.
Claim 6
Independent Claim
77 words
The method of determining the concentration of NOx in a gas comprising providing an electrolyte sensor having two different gas enclosure environments with a first electrode in one environment and a second electrode in the other environment; introducing a test gas to both gas enclosure environments and exposing both electrodes to the test gas; measuring the potential differential between the two electrodes; and determining the concentration of NOx in the test gas from the measured potential differential.
Claim 7
Dependent Claim
24 words
The method in accordance with claim 4 wherein one of the gas enclosure environments encompasses a larger space than the other gas enclosure environment.
Claim 8
Dependent Claim
46 words
The method in accordance with claim 4 wherein the test gas is introduced to one of the gas enclosure environments by way of a passage which is smaller than the passage by way of which the test gas is introduced to the other gas enclosure environment.
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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) | 1996-06-07 | 1996-12-07 | 1997-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-07 | 2000-12-07 | 2001-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-07 | 2004-12-07 | 2005-06-08 | $7700.00 | Window Closed / Lapsed |