Patent US315234A successfully refreshed from Google Patents.
Patent US2842434A successfully refreshed from Google Patents.
US2842434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing crude iron
Assignee: PAUL O TOBELER
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Filing: 1955-07-11
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Granted: 1958-07-08
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Expires: 1975-07-11
Abstract
No abstract record available.
Inventors
- 👤 Kippe Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:06
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; C21; C21B; C21B5/00; C21B5/008; C21B5/02; C22B1/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
THE METHOD OF BENEFICIATING LOW GRADE IRON ORE HAVING A HIGH SILICA AND LOW IRON CONTENT TO PROMOTE SLAG FORMATION AND TO INCREASE THE YIELD OF PIG IRON OBTAINED DURING SMELTING, THAT INCLUDES DRYING TO LUMP-FORM RED MUD COMPRISING THE ALKALI CONTAINING RESIDUE OBTAINED BY SEPARATING A SOLUTION OF SODIUM ALUM FROM A MIXTURE OF IRON-CONTAINING BAUXITE ORE IN THE AQUEOUS SODIUM HYDROXIDE, SAID RED MUD RESIDUE BEING COMPOSED OF FERRIC OXIDE, ALUMINA, SILICA, TITANIUM OXIDE AND SODIUM OXIDE WITH SAID FERRIC OXIDE AND ALUMINA BEING PRESENT IN AN AMOUNT COMPRISING AT LEAST A MAJOR PORTION OF THE TOTAL DRY WEIGHT OF THE RESIDUE COMPOSITION, AND ADMIXING SAID LUMP-FORM RED MUD WITH SAID LOW GRADE ORE FOR REACTION THEREWITH DURING SMELTING IN THE ABSENCE OF METALLIC ALUMINUM.
Claim 2
Independent Claim
127 words
THE METHOD OF BENEFICIATING LOW GRADE IRON ORE HAVING A HIGH SILICA AND LOW IRON CONTENT TO PROMOTE SLAG FORMATION AND TO INCREASE THE YIELD OF PIG IRON OBTAINED DURING SMELTING, THAT INCLUDES DRYING TO LUMP-FORM RED MUD COMPRISING THE ALKALI CONTAINING RESIDUE OBTAINED BY SEPARATING A SOLUTION OF SODIUM ALUM FROM A MIXTURE OF IRON-CONTAINING BAUXITE ORE IN THE AQUEOUS SODIUM HYDROXIDE, SAID RED MUD RESIDUE BEING COMPOSED OF FERRIC OXIDE, ALUMINA, SILICA, TITANIUM OXIDE AND SODIUM OXIDE WITH SAID FERRIC OXIDE AND ALUMINA BEING PRESENT IN AN AMOUNT COMPRISING AT LEAST A MAJOR PORTION OF THE TOTAL DRY WEIGHT OF THE RESIDUE COMPOSITION, AND ADMIXING SAID LUMP-FORM RED MUD WITH SAID LOW GRADE ORE FOR REACTION THEREWITH DURING SMELTING IN THE ABSENCE OF METALLIC ALUMINUM.
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) | 1961-07-07 | 1962-01-06 | 1962-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-07 | 1966-01-06 | 1966-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-07 | 1970-01-06 | 1970-07-08 | $7700.00 | Window Closed / Lapsed |