US2683077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roasting sulfide ores
Assignee: Standard Oil Development Co
•
Filing: 1952-06-12
•
Granted: 1954-07-06
•
Expires: 1972-06-12
Abstract
No abstract record available.
Inventors
- 👤 Warren K Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:15
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; C22B1/10; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
IN A PROCESS FOR ROASTING IRON SULFIDES WITH A FREE OXYGEN-CONTAINING GAS THE IMPROVEMENT WHICH COMPRISES, CONTINUOUSLY INTRODUCING INTO A REACTION ZONE A SUSPENSION OF FINELY DIVIDED IRON SULFIDE IN A FREE OXYGEN-CONTAINING GAS INTO A BOTTOM PORTION OF A DENSE TURBULENT FLUIDIZED BED CONSISTING PREDOMINANTLY OF HOT FINELY DIVIDED IRON OXIDE WHEREBY THE SULFIDE IS OXIDIZED AND SO2 PRODUCED; INDIRECTLY COOLING THE CONTENTS THE FLUIDIZED BED BY CIRCULATING A COOLING FLUID THROUGH A COOLING COIL IMMERSED IN SAID BED, REMOVING OVERHEAD FROM THE REACTION ZONE A GAS CONTAINING SO2, AND CONTINUOUSLY SEPARATELY REMOVING SOLIDS CONSISTING SUBSTANTIALLY OF IRON OXIDE WITH SMALL AMOUNTS OF IRON SULFIDE FROM A
Claim 2
Dependent Claim
108 words
IN A PROCESS FOR ROASTING IRON SULFIDES WITH A FREE OXYGEN-CONTAINING GAS THE IMPROVEMENT WHICH COMPRISES, CONTINUOUSLY INTRODUCING INTO A REACTION ZONE A SUSPENSION OF FINELY DIVIDED IRON SULFIDE IN A FREE OXYGEN-CONTAINING GAS INTO A BOTTOM PORTION OF A DENSE TURBULENT FLUIDIZED BED CONSISTING PREDOMINANTLY OF HOT FINELY DIVIDED IRON OXIDE WHEREBY THE SULFIDE IS OXIDIZED AND SO2 PRODUCED; INDIRECTLY COOLING THE CONTENTS THE FLUIDIZED BED BY CIRCULATING A COOLING FLUID THROUGH A COOLING COIL IMMERSED IN SAID BED, REMOVING OVERHEAD FROM THE REACTION ZONE A GAS CONTAINING SO2, AND CONTINUOUSLY SEPARATELY REMOVING SOLIDS CONSISTING SUBSTANTIALLY OF IRON OXIDE WITH SMALL AMOUNTS OF IRON SULFIDE FROM A
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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) | 1957-07-05 | 1958-01-04 | 1958-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-05 | 1962-01-04 | 1962-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-05 | 1966-01-04 | 1966-07-06 | $7700.00 | Window Closed / Lapsed |