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Patent US3717490A successfully refreshed from Google Patents.
US3717490A
Expired / Lapsed
US
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Method of treating slag
Assignee: LEVY E CO US
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Filing: 1971-02-01
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Granted: 1973-02-20
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Expires: 1991-02-01
Abstract
Abstract A METHOD OF TREATING STEEL FURNACE SLAG IN ORDER TO CONVERT UNRECTED CALCIUM OXIDE AND CALCIUM HYDROXIDE INTO A FORM WHICH WILL NOT CAUSE EITHER VOLUMETRIC EX- PANSION OR LEACHING. WET CRUSHED SLAG IS BROUGH INTO CONTACT WITH CARBONATE IONS. THE WATER HYDRATES THE CALCIUM OXIDE TO FORM CALCIUM HYDROXIDE, AND THE CALCIUM AND CARBONATE IONS COMBINE TO FORM CALCIUM CARBONATE.
Inventors
- 👤 K Hauser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:03
CPC Classifications
C; C04; C04B; C04B5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |