US2810633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of recovering iron values from blast furnace dust
Assignee: Individual
•
Filing: 1952-02-20
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Granted: 1957-10-22
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Expires: 1972-02-20
Abstract
No abstract record available.
Inventors
- 👤 Cooper Jack Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:47
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/16; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/917; Y10S423/00; Y10S423/01; Y10S423/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
130 words
THE PROCESS OF TREATING AN AQUEOUS SUSPENSION OF PULVERULENT SOLIDS RECOVERED FROM THE OPERATION OF A BLAST FURNACE COMPRISING AGITATING AND AERATING THIS SUSPENSION AND SLOWLY ADDING FERROUS SULPHATE, SAID ADDITION, AGGITATION AND AERATION BEING CONDUCTED SO THAT AN NO TIME DOES THE CONCENTRATION OF CALCIUM SULPHATE SO PRODUCED EXCEED THE SOLUBILITY OF CALCIUMN SULPHATE IN THE EXISTING LIQUID, TRANSFERRING THE SUSPENSION TO A MIXING AND AERATING CHAMBER AND THERE ADDING SUFFICIENT CALCIUM HYDROXIDE TO PRECIPITATE ALL SOLUBLE IRON SALTS, TRANSFERRING THE SUBPENSION TO A COAGULAR AND THERE GENTLY AGITATING TO FLOCCULATE THE SOLIDS, SETTLING THE MIX TO PRODUCE A SUBSTANTIALLY CLEAR EFFLUENT AND A SLURRY, DEWATERING THE SLURRY TO PRODUCE A HIGHLY FERRUGINOUS SLUDGE AND SINTERING THE SLUDGE TO PROVIDE A MATERIAL SUITABLE FOR CHARGING INTO A BLAST FURNACE.
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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) | 1960-10-21 | 1961-04-22 | 1961-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-21 | 1965-04-22 | 1965-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-21 | 1969-04-22 | 1969-10-22 | $7700.00 | Window Closed / Lapsed |