Patent US3199974A successfully refreshed from Google Patents.
US3199974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidized iron ore reduction process for production of iron powder
Assignee: Hydrocarbon Research Inc
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Filing: 1964-05-25
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Granted: 1965-08-10
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Expires: 1984-05-25
Abstract
No abstract record available.
Inventors
- 👤 Clarence A Johnson
- 👤 Volk William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:01
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0033; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20; B22F9/22; C21B13/0086; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
187 words
A METHOD FOR THE PRODUCTION OF IRON POWDER FOR POWDER METALLURGY WHICH POWDER WILL HAVE A VOLUMEWEIGHT RATIO LESS THAN 2.5 AND OF A SIZE ALL PASSING THROUGH A 100 MESH SCREEN AND FROM 50-80% PASSING THROUGH A 325 MESH SCREEN, WHICH COMPRISES FEEDING AN IRON OXIDE NORMALLY OF A SIZE ALL OF WHICH WILL PASS THROUGH A 20 MESH SCREEN AND AT LEAST ABOUT 25% OF WHICH PASSES THROUGH A 325 MESH SCREEN, PASSING A HYDROGEN GAS THROUGH THE REACTION ZONE AT A VELOCITY TO FLUIDIZE ORE, MAINTAINING A TEMPERATURE IN THE REACTION ZONE IN THE ORDER OF 700-1100*F., MAINTAINING A SUPERATMOSPHERIC PRESSURE IN THE REACTION ZONE IN THE RANGE OF 150 TO 650 P.S.I.G., REMOVING THE REDUCED IRON WHEN THE REDUCTION IS AT LEAST 90% COMPLETE AND THE IRON IS PYROPHORIC, AND SCREENING A FINE FRACTION OF A SIZE ALL OF WHICH WILL PASS A 100 MESH SCREEN AND FROM 50 TO 80% OF WHICH WILL PASS A 325 MESH SCREEN FROM THE REMAINING MATERIAL HAVING A SIZE ALL OF WHICH PASSES A 20 MESH SCREEN AND FROM 0-30% PASSING THROUGH A 100 MESH SCREEN.
Claim 2
Independent Claim
187 words
A METHOD FOR THE PRODUCTION OF IRON POWDER FOR POWDER METALLURGY WHICH POWDER WILL HAVE A VOLUMEWEIGHT RATIO LESS THAN 2.5 AND OF A SIZE ALL PASSING THROUGH A 100 MESH SCREEN AND FROM 50-80% PASSING THROUGH A 325 MESH SCREEN, WHICH COMPRISES FEEDING AN IRON OXIDE NORMALLY OF A SIZE ALL OF WHICH WILL PASS THROUGH A 20 MESH SCREEN AND AT LEAST ABOUT 25% OF WHICH PASSES THROUGH A 325 MESH SCREEN, PASSING A HYDROGEN GAS THROUGH THE REACTION ZONE AT A VELOCITY TO FLUIDIZE ORE, MAINTAINING A TEMPERATURE IN THE REACTION ZONE IN THE ORDER OF 700-1100*F., MAINTAINING A SUPERATMOSPHERIC PRESSURE IN THE REACTION ZONE IN THE RANGE OF 150 TO 650 P.S.I.G., REMOVING THE REDUCED IRON WHEN THE REDUCTION IS AT LEAST 90% COMPLETE AND THE IRON IS PYROPHORIC, AND SCREENING A FINE FRACTION OF A SIZE ALL OF WHICH WILL PASS A 100 MESH SCREEN AND FROM 50 TO 80% OF WHICH WILL PASS A 325 MESH SCREEN FROM THE REMAINING MATERIAL HAVING A SIZE ALL OF WHICH PASSES A 20 MESH SCREEN AND FROM 0-30% PASSING THROUGH A 100 MESH SCREEN.
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) | 1968-08-09 | 1969-02-08 | 1969-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-09 | 1973-02-08 | 1973-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-09 | 1977-02-08 | 1977-08-10 | $7700.00 | Window Closed / Lapsed |