US3827880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inclusion of hydroboracite in additive composition and use thereof in steel refining
Assignee: British Steel Corp
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Filing: 1972-12-07
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Granted: 1974-08-06
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Expires: 1992-12-07
Abstract
Abstract CERTAIN BORON-CONTAINING COMPOUNDS HAVE BEEN PROPOSED FOR USE AS ADDITIVES IN BASIC OXYGEN STEELMAKING TO ACCELERATE THE DISSOLUTION RATE OF LIME IN THE SLAG. IT HAS BEEN FOUND THAT THE COMPLEX BORON COMPOUND HYDROBORACITE, AVAILABLE AS AN ORE, SHOWS SURPRISING IMPROVED PROPERTIES OVER THE BORON ORES PREVIOUSLY PROPOSED. HYDROBORACITE MAY BE USED EITHER TO INCREASE LIME DISSOLUTION RATE OR TO PROMOTE SLAG FLUIDITY, MAY BE USED IN BASIC OXYTEN STEELMAKING OR ELECTRIC ARC STEELMAKING, AND MAY BE ADDED IN ADMIXTURE WITH FLUOROSPAR AND/OR LIME.
Inventors
- 👤 H Greeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:10
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/36
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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |