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US4131450A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for manufacturing cobalt-base reduced powder

Assignee: Mitsubishi Materials Corp
•
Filing: 1978-02-09
•
Granted: 1978-12-26
•
Expires: 1998-02-09
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Abstract

Abstract A main raw material powder comprising cobalt oxide powder, chromium oxide powder and carbon powder is added with at least one metal oxide powder selected from the group consisting of manganese oxide powder, vanadium oxide powder, titanium oxide powder, tantalum oxide powder, niobium oxide powder, boron oxide powder, hafnium oxide powder, tungsten oxide powder, molybdenum oxide powder, iron oxide powder, nickel oxide powder and copper oxide powder; these powders are then mixed and pulverized to prepare a mixed powder; said mixed powder is then reduced by heating under vacuum or in a reducing atmosphere to obtain a reduced sponge-like mass; said sponge-like mass is finely pulverized, thereby manufacturing a cobalt-base reduced powder.

Inventors

  • 👤 Yuichi Saito
  • 👤 Masayuki Iijima
  • 👤 Osamu Mayama

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 09:23
CPC Classifications
F; F17; F17C; F17C11/00; F17C11/002; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20; B22F9/22

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 105 words
A process for manufacturing a cobalt-base reduced powder which comprises: adding, to a main raw material powder comprising cobalt oxide powder, chromium oxide powder and carbon powder, at least one metal oxide powder selected from the group consisting of manganese oxide powder, vanadium oxide powder, titanium oxide powder, tantalum oxide powder, niobium oxide powder, boron oxide powder, hafnium oxide powder, tungsten oxide powder, molybdenum oxide powder, iron oxide powder, nickel oxide powder and copper oxide powder; mixing and pulverizing these powders to prepare a mixed powder; reducing said mixed powder by heating to obtain a reduced sponge-like mass; and finely pulverizing said reduced sponge-like mass.
Claim 2
Dependent Claim 105 words
A process for manufacturing a cobalt-base reduced powder which comprises: adding, to a main raw material powder comprising cobalt oxide powder, chromium oxide powder and carbon powder, at least one metal oxide powder selected from the group consisting of manganese oxide powder, vanadium oxide powder, titanium oxide powder, tantalum oxide powder, niobium oxide powder, boron oxide powder, hafnium oxide powder, tungsten oxide powder, molybdenum oxide powder, iron oxide powder, nickel oxide powder and copper oxide powder; mixing and pulverizing these powders to prepare a mixed powder; reducing said mixed powder by heating to obtain a reduced sponge-like mass; and finely pulverizing said reduced sponge-like mass.
Claim 3
Dependent Claim 17 words
The process as claimed in claim 1, wherein said mixed powder is reduced by heating under vacuum.
Claim 4
Dependent Claim 19 words
The process as claimed in claim 1, wherein said mixed powder is reduced by heating in a hydrogen atmosphere.
Claim 5
Dependent Claim 32 words
The process as claimed in claim 1, wherein said mixed powder is reduced by heating at a temperature of 700-1,150° C. in a reducing atmosphere of a dew point of -20° C.

References Cited (Backward Citations)

US2091017A Cited
US2160670A Cited
US2854327A Cited
US2853767A Cited
US3488291A Cited
US3510292A Cited
DE2153626A1 Cited
US4047982A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1981-12-25 1982-06-26 1982-12-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1985-12-25 1986-06-26 1986-12-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1989-12-25 1990-06-26 1990-12-26 $7700.00 Window Closed / Lapsed

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