Patent US4088543A successfully refreshed from Google Patents.
US4088543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Technique for protecting sensing electrodes in sulfiding environments
Assignee: Rosemount Inc
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Filing: 1976-09-10
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Granted: 1978-05-09
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Expires: 1996-09-10
Abstract
Abstract The deteriorating influence of sulfide environments on the sensing electrode of a conventional oxygen ion conductive solid electrolyte electrochemical cell is minimized by controllably introducing oxygen to the sensing electrode when the oxygen content of the environment to which the sensing electrode is exposed diminishes to a predetermined level, thereby avoiding undesirable cycling of the environment between oxidizing and sulfiding conditions.
Inventors
- 👤 Roswell J. Ruka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:21
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4077; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A method of protecting the sensing electrode of an oxygen sensing solid electrolyte electrochemical cell from the deteriorating affects of a reducing atmosphere of a gas environment contacting said sensing electrode, said cell developing an EMF signal indicative of the oxygen content of said gas environment, comprising the steps of, intermittently measuring the EMF signal as an indication of the oxygen content of the gas environment, and, between said intermittent measurements, protecting the sensing electrode by maintaining an oxidizing atmosphere in the gas environment in response to said EMF signal.
Claim 2
Independent Claim
90 words
A method of protecting the sensing electrode of an oxygen sensing solid electrolyte electrochemical cell from the deteriorating affects of a reducing atmosphere of a gas environment contacting said sensing electrode, said cell developing an EMF signal indicative of the oxygen content of said gas environment, comprising the steps of, intermittently measuring the EMF signal as an indication of the oxygen content of the gas environment, and, between said intermittent measurements, protecting the sensing electrode by maintaining an oxidizing atmosphere in the gas environment in response to said EMF signal.
References Cited (Backward Citations)
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Cited
US3514377A
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US3699032A
Cited
US3819499A
Cited
US3923624A
Cited
US3960500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |