US2862808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for reducing iron oxide pellets
Assignee: ALAN N MANN
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Filing: 1957-07-31
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Granted: 1958-12-02
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Expires: 1977-07-31
Abstract
No abstract record available.
Inventors
- 👤 Jahn Fredrik W De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:21
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0046; C21B13/0053; C21B13/0086; C21B13/02; C21B13/029; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/122; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A PROCESS OF REDUCING POROUS PELLETS OF IRON OXIDE WHICH COMPRISES PASSING SUCH PELLETS DOWNWARDLY THROUGH A SHAFT FURNACE IN COUNTERCURRENT TO A HOT CURRENT OF REDUCING GAS COMPRISING HYDROGEN AND NITROGEN AT A TEMPERATURE OF BETWEEN 1300*F. AND 1600R*F. AND AT A PRESSURE OF BETWEEN 25 AND 400 POUNDS PER SQUARE INCH WHEREBY THE PELLETS ARE HEATED TO A TEMPERATURE OF AT LEAST 1300*F. AND REDUCED, AND THEN WITHOUT WITHDRAWING SUCH PELLETS FROM THE SHAFT, CONTINUING THEIR DOWNWARD MOVEMENT THROUGH A RISING ZONE OF COLD GAS OF LIKE COMPOSITION AND PRESSURE TO THE SAID HOT GAS WHEREBY THE PELLETS GIVE UP THEIR HEAT TO SUCH GAS WHICH THEREAFTER BLENDS WITH THE HOT GAS AND THE TEMPERATURE OF THE PELLETS IS LOWERED TO BELOW 800*F., THEN AS THE PELLETS EMERGE FROM THE FURNACE AND WHILE STILL SURROUNDED BY THE REDUCING GAS, SUBJECTING THEM TO MACHANICAL AGITATION TO SEPARATE ADHERED PELLETS, AND FINALLY GRADUALLY COOLING THE PELLETS AND WITHDRAWING THEM FROM THE REDUCING ATMOSPHERE.
Claim 2
Dependent Claim
163 words
A PROCESS OF REDUCING POROUS PELLETS OF IRON OXIDE WHICH COMPRISES PASSING SUCH PELLETS DOWNWARDLY THROUGH A SHAFT FURNACE IN COUNTERCURRENT TO A HOT CURRENT OF REDUCING GAS COMPRISING HYDROGEN AND NITROGEN AT A TEMPERATURE OF BETWEEN 1300*F. AND 1600R*F. AND AT A PRESSURE OF BETWEEN 25 AND 400 POUNDS PER SQUARE INCH WHEREBY THE PELLETS ARE HEATED TO A TEMPERATURE OF AT LEAST 1300*F. AND REDUCED, AND THEN WITHOUT WITHDRAWING SUCH PELLETS FROM THE SHAFT, CONTINUING THEIR DOWNWARD MOVEMENT THROUGH A RISING ZONE OF COLD GAS OF LIKE COMPOSITION AND PRESSURE TO THE SAID HOT GAS WHEREBY THE PELLETS GIVE UP THEIR HEAT TO SUCH GAS WHICH THEREAFTER BLENDS WITH THE HOT GAS AND THE TEMPERATURE OF THE PELLETS IS LOWERED TO BELOW 800*F., THEN AS THE PELLETS EMERGE FROM THE FURNACE AND WHILE STILL SURROUNDED BY THE REDUCING GAS, SUBJECTING THEM TO MACHANICAL AGITATION TO SEPARATE ADHERED PELLETS, AND FINALLY GRADUALLY COOLING THE PELLETS AND WITHDRAWING THEM FROM THE REDUCING ATMOSPHERE.
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) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |