Patent US3601381A successfully refreshed from Google Patents.
US3601381A
Expired / Lapsed
US
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Gas sampling device
Assignee: ZURICH BRANCH OF MIDREX INTERNATIONAL BV A NETHERLANDS Corp
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Filing: 1969-05-15
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Granted: 1971-08-24
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Expires: 1989-05-15
Abstract
Abstract This disclosure is directed to a gas sampler useful in apparatus for the direct reduction of iron oxide to metallic iron such as a vertical shaft type furnace employing a gaseous reductant. A novel arrangement of gas sampling is employed which enables the degree of reduction being achieved to be determined and controlled, in situ, by gas analysis.
Inventors
- 👤 Donald Beggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:24
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/02; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
The furnace of claim 1 wherein said changing means is responsive to said measuring means.
Claim 2
Independent Claim
169 words
An apparatus for indicating the degree of reduction of oxide particles during the reduction of said particles in a gaseous reduction process, said apparatus comprising: a furnace having an inlet and an outlet for said particles, means for introducing said particles into said inlet, means for causing said particles to flow in a stream through said furnace towards said outlet, means for introducing a reducing gas downstream from said inlet, means for producing a counterflow of said gas through said particle stream, intake means for withdrawing a sample of said reducing gas from a location along the stream where the particles should be substantially reduced, said intake means being spaced laterally across said particle stream a substantial distance from said gas introducing means such that said gas must pass through at least a portion of said stream before entering said intake, and means to indicate the relative amounts of one of the constituents of said reducing gas prior to its introduction into said furnace and also in said sample.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |