Gas analyzer
Abstract
Abstract A CATALYTIC COMBUSTION TYPE GAS ANALYZER WHICH MIXES GAS AND AIR IN A SELECTED RATIO. THE MIXTURE IS PASSED OVER A PAIR OF ELECTRICALLY HEATED RESISTANCE, ELEMENTS, ONLY ONE OF WHICH IS CATALYTICALLY ACTIVE, CONNECTED IN A WHEATSTONE BRIDGE MEASURING CIRCUIT. ANY COMBUSTILE GAS IN THE SAMPLE IS OXIDIZED AT THE CATALYTIC SURFACE OF THE ACTIVE ELEMENT, PRODUCING AN ELEMENT TEMPERATURE RISE PROPORTIONAL TO THE PERCENTAGE OF COMBUSTIBLE GAS, THEREBY UNBALANCING THE WHEATSTONE BRIDGE. THE ELEMENTS UTILIZE A CERAMICALLY COATED ELECTRICAL CONDUCTOR, OVER WHICH A GLASS SEAL IS FORMED. AN ALUMINUM OR BERYLLIUM OXIDE COATING COVERS THE GLASS SEAL. THE CATALYTICALLY ACTIVE ELEMENT HAS A CATALYTIC COATING OVER THE OCIDE COATING.
Inventors
- 👤 Young Ho Kim
- 👤 John N Pattison
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |