Patent US3748121A successfully refreshed from Google Patents.
US3748121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of molten ferrous metals
Assignee: Foseco International Ltd
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Filing: 1971-03-29
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Granted: 1973-07-24
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Expires: 1991-03-29
Abstract
Abstract Molten ferrous metals may be desulpherized with an additive comprising lime, sodium carbonate, fluorspar and not more than 0.25 percent by weight metal chloride.
Inventors
- 👤 R Atterbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:11
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04; C21C7/064
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
A method according to claim 1 wherein the additive is added to the molten metal when the molten metal is in a ladle, prior to teeming.
Claim 2
Dependent Claim
12 words
A method according to claim 1 wherein the molten metal is steel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |