Patent US3227546A successfully refreshed from Google Patents.
US3227546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct reduction of metallic ores
Assignee: Hydrocarbon Research Inc
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Filing: 1965-07-14
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Granted: 1966-01-04
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Expires: 1985-07-14
Abstract
No abstract record available.
Inventors
- 👤 Clarence A Johnson
- 👤 Theodore M Engle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:51
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0033; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A METHOD OF DIRECTLY REDUCING METALLIC OXIDE FINES OF THE CLASS OF MILL SCALE, HEMATITE, AND MAGNETITE ORE WHICH FINES CONTAIN LESS THAN 0.1 WEIGHT PERCENT CARBON, AND WHICH FINES ARE SMALLER THAN 200 MICRON AVERAGE SIZE AND TEND TO ADHERE ONE TO THE OTHER WHEN REDUCED WITH A HYDROGEN RICH GAS AT TEMPERATURES ABOVE 600*F. AND PRESSURES IN THE RANGE OF 200 TO 600 P.S.I.G., WHICH COMPRISES MIXING SAID FINES A SUPERFICIAL SURFACE COATING OF CARBON WHEREBY THE CARBON CONTENT OF THE FINES IS AT LEAST 0.15 WEIGHT PERCENT AND NOT TO EXCEED 3.0 WEIGHT PERCENT, INTRODUCING SAID COATED FINES INTO A REACTION ZONE MAINTAINED AT A TEMPERATURE IN THE RANGE OF 700 TO 1400* F., AND PASSING A REDUCING GAS OF HIGH PURITY HYDROGEN UPWARDLY THROUGH THE FINES AT A VELOCITY TO MAINTAIN THE FINES IN A MOBILIZED CONDITION AND TO ESTABLISH DIRECT CONTACT OF THE REDUCING GAS WITH THE FINES, AND THEREAFTER REMOVING THE REDUCED MATERIAL FROM THE REACTION ZONE.
Claim 2
Independent Claim
163 words
A METHOD OF DIRECTLY REDUCING METALLIC OXIDE FINES OF THE CLASS OF MILL SCALE, HEMATITE, AND MAGNETITE ORE WHICH FINES CONTAIN LESS THAN 0.1 WEIGHT PERCENT CARBON, AND WHICH FINES ARE SMALLER THAN 200 MICRON AVERAGE SIZE AND TEND TO ADHERE ONE TO THE OTHER WHEN REDUCED WITH A HYDROGEN RICH GAS AT TEMPERATURES ABOVE 600*F. AND PRESSURES IN THE RANGE OF 200 TO 600 P.S.I.G., WHICH COMPRISES MIXING SAID FINES A SUPERFICIAL SURFACE COATING OF CARBON WHEREBY THE CARBON CONTENT OF THE FINES IS AT LEAST 0.15 WEIGHT PERCENT AND NOT TO EXCEED 3.0 WEIGHT PERCENT, INTRODUCING SAID COATED FINES INTO A REACTION ZONE MAINTAINED AT A TEMPERATURE IN THE RANGE OF 700 TO 1400* F., AND PASSING A REDUCING GAS OF HIGH PURITY HYDROGEN UPWARDLY THROUGH THE FINES AT A VELOCITY TO MAINTAIN THE FINES IN A MOBILIZED CONDITION AND TO ESTABLISH DIRECT CONTACT OF THE REDUCING GAS WITH THE FINES, AND THEREAFTER REMOVING THE REDUCED MATERIAL FROM THE REACTION ZONE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |