Patent US3421856A successfully refreshed from Google Patents.
US3421856A
Expired / Lapsed
US
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Method and apparatus for determining the oxygen demand of oxidizable materials
Assignee: Dow Chemical Co
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Filing: 1965-12-29
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Granted: 1969-01-14
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Expires: 1985-12-29
Abstract
No abstract record available.
Inventors
- 👤 Vernon A Stenger
- 👤 Clayton E Vanhall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:49
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/18; G01N33/1806; G01N31/00; G01N31/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A METHOD FOR DETERMINING THE OXYGEN DEMAND OF A MATERIAL WHICH COMPRISES: FLOWING A FEED GAS STREAM CONTAINING CARBON DIOXIDE AS ESSENTIALLY THE SOLE OXIDANT INTO A COMBUSTION CONDUIT HAVING A HEATING ZONE AT A TEMPERATURE OF AT LEAST 500*C. AND THROUGH A CATALYST BED IN THE HEATING ZONE OF THE COMBUSTION CONDUIT, SAID CATALYST BED BEING EFFECTIVE TO PROMOTE THE EQUILIBRATION OF CARBON DIOXIDE WITH OXIDIZABLE COMPONENTS OF THE MATERIAL TO BE ANALYZED, INSERTING A PREDETERMINED QUANITY OF THE MATERIAL TO BE ANALYZED INTO THE GAS STREAM ON THE UPSTREAM SIDE OF THE CATALYST BED WITHIN THE COMBUSTION CONDUIT, AND SWEEPING GASEOUS PRODUCT FORMED THROUGH THE CATALYST BED AND EFFLUENT GAS FROM THE HEATING ZONE INTO AN ANALYZER FOR QUANTITATIVELY INDICATING CARBON MONOXIDE.
Claim 2
Independent Claim
124 words
A METHOD FOR DETERMINING THE OXYGEN DEMAND OF A MATERIAL WHICH COMPRISES: FLOWING A FEED GAS STREAM CONTAINING CARBON DIOXIDE AS ESSENTIALLY THE SOLE OXIDANT INTO A COMBUSTION CONDUIT HAVING A HEATING ZONE AT A TEMPERATURE OF AT LEAST 500*C. AND THROUGH A CATALYST BED IN THE HEATING ZONE OF THE COMBUSTION CONDUIT, SAID CATALYST BED BEING EFFECTIVE TO PROMOTE THE EQUILIBRATION OF CARBON DIOXIDE WITH OXIDIZABLE COMPONENTS OF THE MATERIAL TO BE ANALYZED, INSERTING A PREDETERMINED QUANITY OF THE MATERIAL TO BE ANALYZED INTO THE GAS STREAM ON THE UPSTREAM SIDE OF THE CATALYST BED WITHIN THE COMBUSTION CONDUIT, AND SWEEPING GASEOUS PRODUCT FORMED THROUGH THE CATALYST BED AND EFFLUENT GAS FROM THE HEATING ZONE INTO AN ANALYZER FOR QUANTITATIVELY INDICATING CARBON MONOXIDE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |