US4022444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for adding mischmetal to molten steel
Assignee: Reactive Metals and Alloys Corp
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Filing: 1975-08-25
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Granted: 1977-05-10
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Expires: 1995-08-25
Abstract
Abstract A method, apparatus and alloy for adding mischmetal to molten steel by filling a metal canister with a mischmetal-magnesium alloy in the range 1% to 2.5% magnesium, plunging the metal canister beneath the surface of the steel bath being treated and holding the canister submerged in the bath until the mischmetal has dissolved.
Inventors
- 👤 Joseph R. Jackman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:28
CPC Classifications
C; C21; C21C; C21C7/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
72 words
A canister for adding rare earths to steel comprising an elongated metal shell having a top attaching means for an inserting rod or bloom, a central lengthwise rod in said shell, a plurality of radial fingers on said rod and a mischmetal-magnesium alloy consisting essentially of about 1% to 2.5% magnesium and the balance mischmetal with ordinary impurities cast in and filling said shell and attached to said central rod and fingers.
Claim 2
Dependent Claim
72 words
A canister for adding rare earths to steel comprising an elongated metal shell having a top attaching means for an inserting rod or bloom, a central lengthwise rod in said shell, a plurality of radial fingers on said rod and a mischmetal-magnesium alloy consisting essentially of about 1% to 2.5% magnesium and the balance mischmetal with ordinary impurities cast in and filling said shell and attached to said central rod and fingers.
Claim 3
Dependent Claim
18 words
A canister as claimed in claim 1 wherein the shell, central rod and fingers are made of steel.
Claim 4
Dependent Claim
24 words
A canister as claimed in claim 6 wherein the mischmetal-magnesium alloy contains about 1.75% to 2% magnesium and the balance mischmetal with ordinary impurities.
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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |