US4437883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing metal powder
Assignee: Nippon Steel Corp
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Filing: 1983-02-14
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Granted: 1984-03-20
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Expires: 2003-02-14
Abstract
Abstract Metal powder having low oxygen and carbon contents and suitable for powder metallurgy may be obtained by using, as an atomizing medium, a special composition containing an alcohol having 1-4 carbon atoms and water as its essential components when impinging the atomizing medium against a molten metal in a state isolated from the ambient air to produce the metal powder.
Inventors
- 👤 Toshihiko Kubo
- 👤 Minoru Ichidate
- 👤 Toshiyuki Kawai
- 👤 Sadao Yonehara
- 👤 Yoshihisa Koiwai
- 👤 Kazuhiko Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:17
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/06; B22F9/08; B22F9/082; B22F2009/0824; B22F2009/086; B22F2009/0864
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
52 words
A process for producing metal powder by impinging an atomizing medium against a molten metal in a state isolated from the ambient air, said atomising medium consist essentially of an alcohol having 1-4 carbon atoms and water and the weight ratio of said alcohol to water is within the range of 2-70:98-30.
Claim 2
Dependent Claim
52 words
A process for producing metal powder by impinging an atomizing medium against a molten metal in a state isolated from the ambient air, said atomising medium consist essentially of an alcohol having 1-4 carbon atoms and water and the weight ratio of said alcohol to water is within the range of 2-70:98-30.
Claim 3
Dependent Claim
91 words
A process for producing metal powder by impinging an atomizing medium against a molten metal in a state isolated from the ambient air, said atomizing medium consists essentially of an alcohol having 1-4 carbon atoms and water and the weight ratio of said alcohol to water is within the range of 2-70:98-30, and said process further comprises, subsequent to the powdering of said molten metal by said atomizing medium, subjecting the resultant metal powder to a treatment selected from the group consisting of a heat treatment, decarburization treatment and reduction treatment.
Claim 4
Dependent Claim
91 words
A process for producing metal powder by impinging an atomizing medium against a molten metal in a state isolated from the ambient air, said atomizing medium consists essentially of an alcohol having 1-4 carbon atoms and water and the weight ratio of said alcohol to water is within the range of 2-70:98-30, and said process further comprises, subsequent to the powdering of said molten metal by said atomizing medium, subjecting the resultant metal powder to a treatment selected from the group consisting of a heat treatment, decarburization treatment and reduction treatment.
Claim 5
Dependent Claim
54 words
A process as claimed in claim 1, wherein the metal subjected to the powdering method is a metal selected from the group consisting of Mg, Al, Fe, Ni, Cu, Zn, Ag, Cd, Sn, Pb, Co, Cr, Mn, Mo, Si and B, or an alloy made of one or more metals selected from the group.
Claim 6
Dependent Claim
54 words
A process as claimed in claim 2, wherein the metal subjected to the powdering method is a metal selected from the group consisting of Mg, Al, Fe, Ni, Cu, Zn, Ag, Cd, Sn, Pb, Co, Cr, Mn, Mo, Si and B, or an alloy made of one or more metals selected from the group.
Claim 7
Dependent Claim
25 words
A process as claimed in claim 3 or 4, wherein the metal subjected to the atomization method is iron, plain carbon steel or alloy steel.
Claim 8
Dependent Claim
26 words
A process as claimed in claim 1 and 2, wherein the alcohol is selected from the group consisting of methanol, ethanol, iso-propanol and a mixture thereof.
Claim 9
Dependent Claim
24 words
A process as claimed in claim 1 or 2, wherein the weight ratio of said alcohol to water is within the range of 10-60:90-40.
Claim 10
Dependent Claim
32 words
A process as claimed in claim 1 or 2, wherein the atomizing medium additionally contains an additive selected from the group consisting of rust preventive, a corrosion preventive and a mixture thereof.
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) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |