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US4224063A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of using iron modifier

Assignee: Individual
•
Filing: 1979-04-26
•
Granted: 1980-09-23
•
Expires: 1999-04-26
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Abstract

Abstract An iron modifier containing, percent by weight; ______________________________________ Silicon 25 to 50 Rare-earth metals 20 to 40 Carbon 10 to 30 Sulphur 0.1 to 0.3 Iron the balance, ______________________________________ the components being added into liquid iron in the form of a mixture of alloys and foundry coke in the following proportions, percent by weight:______________________________________silico-mishmetal 70 to 90foundry coke 10 to 30;______________________________________ and this mixture is introduced in an amount of from 0.3 to 0.5% by weight. The modifier according to the present invention makes it possible to produce thin-walled iron castings without the formation of cementite on the surface thereof.

Inventors

  • 👤 Lev V. Peregudov
  • 👤 Mikhail M. Malashin
  • 👤 Anatoly S. Naletov
  • 👤 Nikolai S. Martynets

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 03:49
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/08

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 89 words
A method of using a modifier containing in percent by weight: ______________________________________ Silicon 25 to 50 Rare Earth Metals 20 to 40 Carbon 10 to 30 Sulphur 0.1 to 0.3 Iron the balance, ______________________________________ comprising the step of adding the components of said modifier into liquid iron in the form of a mixture of silico-mishmetal and foundry coke, the silico-mishmetal comprising the silicon, rare earth metals and iron, the mixture having the following proportions in percent by weight: ______________________________________ silico-mishmetal 70 to 90 foundry coke 10 to 30. ______________________________________
Claim 2
Independent Claim 89 words
A method of using a modifier containing in percent by weight: ______________________________________ Silicon 25 to 50 Rare Earth Metals 20 to 40 Carbon 10 to 30 Sulphur 0.1 to 0.3 Iron the balance, ______________________________________ comprising the step of adding the components of said modifier into liquid iron in the form of a mixture of silico-mishmetal and foundry coke, the silico-mishmetal comprising the silicon, rare earth metals and iron, the mixture having the following proportions in percent by weight: ______________________________________ silico-mishmetal 70 to 90 foundry coke 10 to 30. ______________________________________
Claim 3
Dependent Claim 25 words
A method as claimed in claim 1, wherein said modifier is added into liquid iron in an amount ranging from 0.3 to 0.5% by weight.

References Cited (Backward Citations)

US3158466A Cited
US3492118A Cited
GB1223694A Cited
US3769004A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1983-09-23 1984-03-24 1984-09-23 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1987-09-23 1988-03-24 1988-09-23 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1991-09-23 1992-03-24 1992-09-23 $7700.00 Window Closed / Lapsed

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