Patent US2865732A successfully refreshed from Google Patents.
US2865732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of sponge iron
Assignee: Norsk Hydro Elektrisk Kvaelstof AS
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Filing: 1956-12-26
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Granted: 1958-12-23
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Expires: 1976-12-26
Abstract
No abstract record available.
Inventors
- 👤 Jensen Olaf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:14
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/02; C21B13/023; C21B13/026; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
196 words
A PROCESS FOR REDUCTION OF IRON ORE IN THE FORM OF LUMP ORE, PELLETS OR OTHERWISE AGGLOMERATED IRON ORE CONCENTRATE, WHICH HAS A TENDENCY TO DISINTEGRATE DURING THE REACTION, WITH GAS CONSISTING OF HYDROGEN AND CARBON MONOXIDE AS A REDUCING AGENT, SAID REDUCING GAS CONSISTING OF FRESH GAS AND CIRCULATORY GAS FROM WHICH SUBSTANTIALLY ALL OF THE OZIDIZING PRODUCTS FORMED DURING THE REACTION WITH THE IRON ORE HAVE BEEN REMOVED BEFORE BEING RE-INTRODUCED INTO THE PROCESS, IN A VERTICAL SHAFT FURNACE, HEATED BY MEANS OF ELECTRIC RESISTANCE HEATING, THE IRON ORE MOVING DOWNWARDS IN SAID FURNACE IN COUNTERCURRENT TO SAID REDUCING GAS ASCENDING THROUGH THE FURNACE, THE ORE BEING MIXED WITH A SUBSTANTIAL PART OF RECIRCULATED COOLED SPONGE IRON BEFORE CHARGING THE ORE TO THE TOP OF THE FURNACE, THAT IMPROVEMENT COMPRISING INTRODUCING THE WHOLE AMOUNT OF REDUCING GAS AT THE LOWER END OF THE FURNACE IN A COLD STATE, SAID REDUCING GAS CONTAINING AT LEAST 90% HYDROGEN, CALCULATED ON THE CONTENT OF REDUCING COMPONENTS IN THE GAS, SUPPLYING THE ELECTRICAL ENERGY TO THE FURNACE AT THREE VERTICALLY SPACED POINTS, AND HEATING THE REDUCING GAS TO REACTION TEMPERATURE IN THE ZONE BETWEEN THE TWO LOWER POINTS.
Claim 2
Dependent Claim
196 words
A PROCESS FOR REDUCTION OF IRON ORE IN THE FORM OF LUMP ORE, PELLETS OR OTHERWISE AGGLOMERATED IRON ORE CONCENTRATE, WHICH HAS A TENDENCY TO DISINTEGRATE DURING THE REACTION, WITH GAS CONSISTING OF HYDROGEN AND CARBON MONOXIDE AS A REDUCING AGENT, SAID REDUCING GAS CONSISTING OF FRESH GAS AND CIRCULATORY GAS FROM WHICH SUBSTANTIALLY ALL OF THE OZIDIZING PRODUCTS FORMED DURING THE REACTION WITH THE IRON ORE HAVE BEEN REMOVED BEFORE BEING RE-INTRODUCED INTO THE PROCESS, IN A VERTICAL SHAFT FURNACE, HEATED BY MEANS OF ELECTRIC RESISTANCE HEATING, THE IRON ORE MOVING DOWNWARDS IN SAID FURNACE IN COUNTERCURRENT TO SAID REDUCING GAS ASCENDING THROUGH THE FURNACE, THE ORE BEING MIXED WITH A SUBSTANTIAL PART OF RECIRCULATED COOLED SPONGE IRON BEFORE CHARGING THE ORE TO THE TOP OF THE FURNACE, THAT IMPROVEMENT COMPRISING INTRODUCING THE WHOLE AMOUNT OF REDUCING GAS AT THE LOWER END OF THE FURNACE IN A COLD STATE, SAID REDUCING GAS CONTAINING AT LEAST 90% HYDROGEN, CALCULATED ON THE CONTENT OF REDUCING COMPONENTS IN THE GAS, SUPPLYING THE ELECTRICAL ENERGY TO THE FURNACE AT THREE VERTICALLY SPACED POINTS, AND HEATING THE REDUCING GAS TO REACTION TEMPERATURE IN THE ZONE BETWEEN THE TWO LOWER POINTS.
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) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |