Electrochemical vapor detector
Abstract
Abstract A POTENTIOMETRIC ELECTROCHEMICAL DETECTOR FOR THE QUANTITATIVE DETERMINATION OF AIR-BORNE VAPORS WHICH EXHIBITS LONG-TERM BASE LINE VOLTAGE STABILITY IS DISCLOSED. THE SYSTEM IS ESPECIALLY USEFUL IN THE DETERMINATION OF SUCH COMPOUNDS AS AMMONIA AND AMINES WHICH HAVE IONIZABLE GROUPS CAPABLE OF READILY FORMING REVERSIBLE COMPLEXES WITH A METAL SENSING ELECTRODE AT THE VAPOR-ELECTRODEELECTROLYTE INTERFACE. A POROUS METAL SENSING ELECTRODE IS DISPOSED WITH AN OUTER SURFACE EXPOSED TO A SAMPLE STREAM AND AN INNER SURFACE EXPOSED TO A FLOWING ELECTROLYTE OF PARTIALLY DE-IONIZED WATER. THE FLOWING ELECTROLYTE PROVIDES A CONDUCTIVE PATH BETWEEN THE SENSING ELECTRODE AND A REFERENCE ELECTRODE. PREVENTS CONTAMINATION OF THE REFERENCE HALF-CELL BY DISSOLVED ELECTROACTIVE SPECIES AND, IN CONJUNCTION WITH THE AIR CONTACTING THE ELECTRODE, FUNCTIONS TO REPRODUCE A STABLE STATE OF SURFACE COMPOSITION ON THE SENSING ELECTRODE AFTER EXPOSURE TO A SAMPLE.
Inventors
- 👤 M Nicholas
Bibliographic Details
Claims Analysis
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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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |