US3830709A
Expired / Lapsed
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Method and cell for sensing nitrogen oxides
Assignee: Thermo Orion Inc
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Filing: 1973-04-09
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Granted: 1974-08-20
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Expires: 1993-04-09
Abstract
Abstract AN IMPROVED GAS-SENSING ELECTROCHEMICAL CELL FOR MEASURING NITROGEN DIOXIDE DISSOLVED IN A SAMPLE SOLUTION. THE CELL COMPRISES A POTENTIOMETRIC HYDROGEN ION-SENSITIVE ELECTRODE AND A REFERENCE OR STANDARD ELECTRODE, BOTH IN CONTACT WITH AN INTERNAL STANDARD SOLUTION COMPRISING AN AQUEOUS ACID SOLUTION OF A NITRITE SALT. A HYDROPHOBIC GAS PERMEABLE MEMBRANE SEPARATES THE SAMPLE SOLUTION FROM THE INTERNAL SOLUTION.
Inventors
- 👤 J Krueger
- 👤 J Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:20
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |