Patent US2538201A successfully refreshed from Google Patents.
US2538201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing metallic oxides
Assignee: Inland Steel Co
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Filing: 1944-08-17
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Granted: 1951-01-16
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Expires: 1964-08-17
Abstract
No abstract record available.
Inventors
- 👤 John C Kalbach
- 👤 Marchi Vincent S De
- 👤 Jr Frederick W Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:14
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0033; C22; C22B; C22B5/00; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134; Y10; Y10S; Y10S75/00; Y10S75/962
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
194 words
A METHOD OF REDUCING A HEAVY METAL OXIDE TO FREE METAL AT AN ELEVATED TEMPERATURE WITH REDUCING GAS WHICH IS SPENT IN THE COURSE OF SAID REDUCTION, SAID METHOD COMPRISING PROVIDING SAID OXIDE IN FINELY PARTICULATE FORM FOR FLUIDIZATION BY SAID GAS, INITIALLY SUSPENDING SAID OXIDE IN SPENT HOT REDUCING GAS, FLOWING THE RESULTING FIRST SUSPENSION INTO AN OXIDE PREHEATING FIRST ZONE WITHDRAWING PREHEATED OXIDE FROM THE LOWER PART OF SAID FIRST ZONE, DRAWING OFF SPENT REDUCING GAS FROM THE UPPER PART OF SAID FIRST ZONE, THEREAFTER SUSPENDING THE WITHDRAWN PREHEATED OXIDE IN PREHEATED FRESH REDUCING GAS, FLOWING THE RESULTING SECOND SUSPENSION INTO A SECOND ZONE FOR CONCURRENT FLUIDIZATION AND REDUCTION OF SAID OXIDE BY SAID GAS IN SAID SECOND ZONE, DRAWING OFF HOT SPENT REDCUING GAS FROM THE UPPER PART OF SAID SECOND ZONE, WITHDRAWING HOT REDUCED OXIDE FROM THE LOWER PART OF SAID SECOND ZONE, THEREAFTER SUSPENDING SAID REDUCED OXIDE IN FRESH REDUCING GAS, FLOWING THE RESULTING THIRD SUSPENSION INTO A FRESH GAS PREHEATING THIRD ZONE, DRAWING OFF PREHEATED FRESH REDUCING GAS FROM THE UPPER PART OF SAID THIRD ZONE AND WITHDRAWING REDUCED OXIDE FROM THE LOWER PART OF SAID THIRD ZONE.
Claim 2
Independent Claim
194 words
A METHOD OF REDUCING A HEAVY METAL OXIDE TO FREE METAL AT AN ELEVATED TEMPERATURE WITH REDUCING GAS WHICH IS SPENT IN THE COURSE OF SAID REDUCTION, SAID METHOD COMPRISING PROVIDING SAID OXIDE IN FINELY PARTICULATE FORM FOR FLUIDIZATION BY SAID GAS, INITIALLY SUSPENDING SAID OXIDE IN SPENT HOT REDUCING GAS, FLOWING THE RESULTING FIRST SUSPENSION INTO AN OXIDE PREHEATING FIRST ZONE WITHDRAWING PREHEATED OXIDE FROM THE LOWER PART OF SAID FIRST ZONE, DRAWING OFF SPENT REDUCING GAS FROM THE UPPER PART OF SAID FIRST ZONE, THEREAFTER SUSPENDING THE WITHDRAWN PREHEATED OXIDE IN PREHEATED FRESH REDUCING GAS, FLOWING THE RESULTING SECOND SUSPENSION INTO A SECOND ZONE FOR CONCURRENT FLUIDIZATION AND REDUCTION OF SAID OXIDE BY SAID GAS IN SAID SECOND ZONE, DRAWING OFF HOT SPENT REDCUING GAS FROM THE UPPER PART OF SAID SECOND ZONE, WITHDRAWING HOT REDUCED OXIDE FROM THE LOWER PART OF SAID SECOND ZONE, THEREAFTER SUSPENDING SAID REDUCED OXIDE IN FRESH REDUCING GAS, FLOWING THE RESULTING THIRD SUSPENSION INTO A FRESH GAS PREHEATING THIRD ZONE, DRAWING OFF PREHEATED FRESH REDUCING GAS FROM THE UPPER PART OF SAID THIRD ZONE AND WITHDRAWING REDUCED OXIDE FROM THE LOWER PART OF SAID THIRD ZONE.
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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) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |