Patent US3236628A successfully refreshed from Google Patents.
US3236628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and plant for producing molten pig iron
Assignee: Huettenwerk Oberhausen AG
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Filing: 1961-12-08
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Granted: 1966-02-22
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Expires: 1981-12-08
Abstract
No abstract record available.
Inventors
- 👤 Bogdandy Ludwig Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:35
CPC Classifications
C; C21; C21B; C21B11/00; C21B11/10; B; B01; B01F; B01F31/00; B01F31/80; B01F31/84; B01F31/841; B01F31/85; B01J; B01J19/00; B01J19/08; B01J19/10; C07; C07C; C07C45/00; C07C45/002; C21B5/00; C21B5/001; C21B5/002; C21B5/06; C21B2100/00; C21B2100/20; C21B2100/22; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134; Y02P10/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A PROCESS FOR PRODUCING MOLTEN PIG IRON, IN A FURNACE WITH A VERTICAL SHAFT TERMINATING AT ITS BOTTOM IN A CRUCIBLE, FROM A CHARGE SUBSTANTIALLY FREE FROM CARBONACEOUS MATERIAL AND CONTAINING IRON ORE AND A SLAG-FORMING FLUX, COMPRISING THE STEPS OF PASSING SAID CHARGE DOWNWARDLY THROUGH SAID VERTICAL SHAFT INTO SAID CRUCIBLE; PRODUCING A REDUCING GAS CONSISTING ESSENTIALLY OF CARBON MONOXIDE AND HYDROGEN BY REACTING A FLUID HYDROCARBON WITH OXYGEN; INTRODUCING SAID REDUCING GAS INTO SAID SHAFT AT A LOCATION ALONG THE PATH OF SAID CHARGE JUST ABOVE SAID CRUCIBLE, THEREBY REDUCING SAID IRON ORE AND CONVERTING SAID CHARGE INTO ELEMENTAL IRON AND SLAG; ELECTRICALLY SMELTING THE REDUCED IRON IN SAID CRUCIBLE IN THE PRESENCE OF, AT MOST, A MINOR PROPORTION OF ADDED SOLID CARBON TO PRODUCE A MELT THEREOF; AND HEATING SAID REDUCING GAS
Claim 2
Dependent Claim
135 words
A PROCESS FOR PRODUCING MOLTEN PIG IRON, IN A FURNACE WITH A VERTICAL SHAFT TERMINATING AT ITS BOTTOM IN A CRUCIBLE, FROM A CHARGE SUBSTANTIALLY FREE FROM CARBONACEOUS MATERIAL AND CONTAINING IRON ORE AND A SLAG-FORMING FLUX, COMPRISING THE STEPS OF PASSING SAID CHARGE DOWNWARDLY THROUGH SAID VERTICAL SHAFT INTO SAID CRUCIBLE; PRODUCING A REDUCING GAS CONSISTING ESSENTIALLY OF CARBON MONOXIDE AND HYDROGEN BY REACTING A FLUID HYDROCARBON WITH OXYGEN; INTRODUCING SAID REDUCING GAS INTO SAID SHAFT AT A LOCATION ALONG THE PATH OF SAID CHARGE JUST ABOVE SAID CRUCIBLE, THEREBY REDUCING SAID IRON ORE AND CONVERTING SAID CHARGE INTO ELEMENTAL IRON AND SLAG; ELECTRICALLY SMELTING THE REDUCED IRON IN SAID CRUCIBLE IN THE PRESENCE OF, AT MOST, A MINOR PROPORTION OF ADDED SOLID CARBON TO PRODUCE A MELT THEREOF; AND HEATING SAID REDUCING GAS
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |