US4137072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Additive for use in refining iron
Assignee: Tosoh Corp
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Filing: 1977-11-25
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Granted: 1979-01-30
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Expires: 1997-11-25
Abstract
Abstract Disclosed is an additive in a molded form for use in refining iron. The additive comprises a mixture of at least one metal selected from magnesium, calcium and aluminum, and at least one metal oxide selected from magnesium oxide, calcium oxide and aluminum oxide.
Inventors
- 👤 Noboru Kawakami
- 👤 Takeshi Goto
- 👤 Itsuo Hirano
- 👤 Yoichi Itakura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:05
CPC Classifications
C; C21; C21C; C21C7/00; C21C1/00; C21C1/02; C21C1/025; C21C1/10; C21C1/105
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
31 words
An additive in a molded form for use in refining iron, comprising a mixture of 5% to 90% by weight of magnesium and 10% to 95% by weight of magnesium oxide.
Claim 2
Dependent Claim
31 words
An additive in a molded form for use in refining iron, comprising a mixture of 5% to 90% by weight of magnesium and 10% to 95% by weight of magnesium oxide.
Claim 3
Dependent Claim
35 words
An additive according to claim 1 wherein said mixture is a product obtained by reducing magnesium oxide by solid carbon at a temperature of higher than approximately 1,500° C. and, then quenching the reduction product.
Claim 4
Dependent Claim
25 words
An additive according to claim 1 which is prepared by molding the mixture of a finely divided form by using an organic polymer binding material.
Claim 5
Dependent Claim
42 words
An additive according to claim 1 which is prepared by molding the mixture of a finely divided form and, then, heating the molded product at a temperature of higher than the melting point of magnesium contained therein but lower than 1,100° C.
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) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |