Patent US3022156A successfully refreshed from Google Patents.
US3022156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for reduction of iron orew
Assignee: Texaco Inc
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Filing: 1953-09-14
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Granted: 1962-02-20
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Expires: 1973-09-14
Abstract
No abstract record available.
Inventors
- 👤 Eastman Du Bois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:03
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0033; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134; Y02P10/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
A PROCESS FOR EFFECTING REDUCTION OF IRON OXIDE TO METALLIC IRON, WHICH COMPRISES PASSING HYDROGEN OF AT LEAST 90 PERCENT PURITY UPWARDLY THROUGH A BODY OF SAID IRON OXIDE IN FINELY DIVIDED PARTICLE FROM IN A VERTICALLY EXTENDED UNOBSTRUCTED REDUCTION ZONE AT A PRESSURE IN THE BETWEEN 700 AND 1,050*F. AND AT A PRESSURE IN THE RANGE OF 250 TO 650 POUNDS PER SQUARE INCH GAUGE, WITHDRAWING AN EFFLUENT GAS FROM SAID REDUCTION ZONE, REMOVING WATER FROM SAID EFFLUENT GAS TO BELOW 1 PERCENT, RECOMPRESSING SAID EFFLUENT GAS TO A PRESSURE OF AT LEAST 250 POUNDS PER SQUARE INCH GAUGE, HEATING SAID REPRESSURED EFFLUENT GAS TO A TEMPERATURE ABOVE THAT MAINTAINED IN SAID REDUCTION ZONE, AND PASSIG SAID HEATED REPRESSURED EFFLUENT RECYCLE GAS TOGETHER WITH SAID FRESH FEED HYDROGEN OF AT LEAST 9/ PERCENT PURITY INTO SAID REDUCTION ZONE IN RELATIVE PROPORTIONS SUCH THAT AT LEAST
Claim 2
Dependent Claim
146 words
A PROCESS FOR EFFECTING REDUCTION OF IRON OXIDE TO METALLIC IRON, WHICH COMPRISES PASSING HYDROGEN OF AT LEAST 90 PERCENT PURITY UPWARDLY THROUGH A BODY OF SAID IRON OXIDE IN FINELY DIVIDED PARTICLE FROM IN A VERTICALLY EXTENDED UNOBSTRUCTED REDUCTION ZONE AT A PRESSURE IN THE BETWEEN 700 AND 1,050*F. AND AT A PRESSURE IN THE RANGE OF 250 TO 650 POUNDS PER SQUARE INCH GAUGE, WITHDRAWING AN EFFLUENT GAS FROM SAID REDUCTION ZONE, REMOVING WATER FROM SAID EFFLUENT GAS TO BELOW 1 PERCENT, RECOMPRESSING SAID EFFLUENT GAS TO A PRESSURE OF AT LEAST 250 POUNDS PER SQUARE INCH GAUGE, HEATING SAID REPRESSURED EFFLUENT GAS TO A TEMPERATURE ABOVE THAT MAINTAINED IN SAID REDUCTION ZONE, AND PASSIG SAID HEATED REPRESSURED EFFLUENT RECYCLE GAS TOGETHER WITH SAID FRESH FEED HYDROGEN OF AT LEAST 9/ PERCENT PURITY INTO SAID REDUCTION ZONE IN RELATIVE PROPORTIONS SUCH THAT AT LEAST
Claim 3
Dependent Claim
36 words
VOLUMES OF RECYCLE GAS TO EACH COLUME OF FRESH HYDROGEN FEED IS MAINTAINED, THE SUPERFICAL LINEAR VELOCITY OF SAID FRESH FEED HYDROGEN TOGETHER WITH SAID RECYCLE GAS THROUGH SAID BODY OF IRON ORE BEING BETWEEN 0.5
Claim 4
Dependent Claim
36 words
VOLUMES OF RECYCLE GAS TO EACH COLUME OF FRESH HYDROGEN FEED IS MAINTAINED, THE SUPERFICAL LINEAR VELOCITY OF SAID FRESH FEED HYDROGEN TOGETHER WITH SAID RECYCLE GAS THROUGH SAID BODY OF IRON ORE BEING BETWEEN 0.5
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) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |