US2836487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the separation of iron from other metals accompanying iron in ores or waste materials
Assignee: AG fur UNTERNEHMUNGEN DER EISENUND STAHLINDUSTRIE
•
Filing: 1956-01-31
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Granted: 1958-05-27
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Expires: 1976-01-31
Abstract
No abstract record available.
Inventors
- 👤 Dietrich H Fastje
- 👤 Rudolph H Gerlach
- 👤 Otto K Vorwerk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:17
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/08; C21B3/00; C21B3/04; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y02W; Y02W30/00; Y02W30/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A PROCESS FOR SEPARATING ION FROM METALS ACCOMPANYING IRON IN ORES AND WASTE MATERIALS, WHICH ACCOMPANYING METALS ARE VOLATILIZABLE DURING THE REDUCTION OF IRON, COMPRISING A FIRST STEP OF SMELTING THE ORES AND WASTE MATERIAL IN A BLAST FURNACE TO FORM PIG IRON, AND A SECOND STEP OF REDUCING A CHARGE COMPRISING THE FLUE DUSTS FROM SAID BLAST FURNACE STEP AND SLUDGE OBTAINED FROM SAID FLUE DUSTS, IN A ROTARY KILN, SAID FLUE DUSTS AND SLUDGE CONTAINING COMPOUNDS OF IRON AS WELL AS OF SAID VOLATILIZ-
Claim 2
Dependent Claim
86 words
A PROCESS FOR SEPARATING ION FROM METALS ACCOMPANYING IRON IN ORES AND WASTE MATERIALS, WHICH ACCOMPANYING METALS ARE VOLATILIZABLE DURING THE REDUCTION OF IRON, COMPRISING A FIRST STEP OF SMELTING THE ORES AND WASTE MATERIAL IN A BLAST FURNACE TO FORM PIG IRON, AND A SECOND STEP OF REDUCING A CHARGE COMPRISING THE FLUE DUSTS FROM SAID BLAST FURNACE STEP AND SLUDGE OBTAINED FROM SAID FLUE DUSTS, IN A ROTARY KILN, SAID FLUE DUSTS AND SLUDGE CONTAINING COMPOUNDS OF IRON AS WELL AS OF SAID VOLATILIZ-
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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) | 1961-05-26 | 1961-11-25 | 1962-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-26 | 1965-11-25 | 1966-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-26 | 1969-11-25 | 1970-05-27 | $7700.00 | Window Closed / Lapsed |