US4039320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reducing material for steel making
Assignee: Aikoh Co Ltd
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Filing: 1976-03-17
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Granted: 1977-08-02
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Expires: 1996-03-17
Abstract
Abstract During the reducing period in steel making, particularly in the making of stainless steel, the reduction of oxides in the slag and desulphurization of the molten steel are promoted by adding a reducing material, which is prepared by mixing uniformly aluminum powder and lime and the, like and compression molding the mixture into a desired shape.
Inventors
- 👤 Masazi Uemura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:46
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04; C21C7/064; C21C5/00; C21C5/28; C21C5/36; C21C7/076; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
40 words
A reducing material for steel making, consisting essentially of 20- 50% aluminum and 40- 80% lime, said substances being uniformly mixed together and molded into a desired size such that the aluminum is substantially protected from exposure to the atmosphere.
Claim 2
Dependent Claim
40 words
A reducing material for steel making, consisting essentially of 20- 50% aluminum and 40- 80% lime, said substances being uniformly mixed together and molded into a desired size such that the aluminum is substantially protected from exposure to the atmosphere.
Claim 3
Dependent Claim
35 words
A reducing material for steel making as set forth in claim 1, wherein aluminum powder and lime and the like are uniformly mixed together and compression molded into a cylindrical shape of a desired size.
Claim 4
Dependent Claim
86 words
A reducing material for steel making according to claim 1, wherein the aluminum is in the form of a powder having a particle size distribution such that 75% or more of the powder has a Tyler's 10- 20 mesh size (1.65- 83 mm), less than 5% has a Tyler's 10 mesh size or larger, less than 20% has a Tyler's 20 mesh size or smaller; and wherein the lime has a particle size such that it has a Tyler's 10 mesh size or higher mesh number.
Claim 5
Dependent Claim
30 words
A reducing material for steel making as set forth in claim 1, wherein the lime is present in an amount of 70% and the aluminum in an amount of 30%.
References Cited (Backward Citations)
US3537842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |