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US5095048A
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Method of manufacturing a composition for use in injection molding powder metallurgy
Assignee: Sumitomo Metal Mining Co Ltd
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Filing: 1990-10-01
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Granted: 1992-03-10
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Expires: 2010-10-01
Abstract
Abstract A composition for use in injection molding powder metallurgy, is provided by applying mechanical sphericalization to a metal powder of an irregular shape and having an average grain size of not more than 50 mu m to form a sphericalized metal powder, and then mixing and kneading a binder of not more than 9 parts by volume relative to 11 parts by volume of the sphericalized metal powder.
Inventors
- 👤 Nobuji Takahashi
- 👤 Kouhei Kibayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:47
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/22; B22F3/225; B22F1/00; B22F1/06; B22F1/065; C; C08; C08K; C08K7/00; C08K7/16; B22F2998/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A method of manufacturing a composition for use in injection molding powder metallurgy, which comprises the steps of: (a) providing a metal powder whose grains are of irregular shape and wherein the average grain size does not exceed 50 μm, (b) mechanically sphericalizing the metal powder of step (a) to provide a sphericalized metal powder, (c) mixing a binder into said sphericalized metal powder at a ratio of 9 parts by volume of binder to 11 parts by volume of powder, and (d) kneading the mixture of step (c), thereby providing said composition.
Claim 2
Independent Claim
93 words
A method of manufacturing a composition for use in injection molding powder metallurgy, which comprises the steps of: (a) providing a metal powder whose grains are of irregular shape and wherein the average grain size does not exceed 50 μm, (b) mechanically sphericalizing the metal powder of step (a) to provide a sphericalized metal powder, (c) mixing a binder into said sphericalized metal powder at a ratio of 9 parts by volume of binder to 11 parts by volume of powder, and (d) kneading the mixture of step (c), thereby providing said composition.
Claim 3
Dependent Claim
24 words
The method according to claim 1, wherein the metal powder of step (a) has a average grain size of not more than 20 μm.
Claim 4
Dependent Claim
25 words
The method according to claim 1, wherein in step (b) the grains of metal powder are impacted against one another or against a hard surface.
Claim 5
Dependent Claim
20 words
The method according to claim 1, wherein said binder is selected from the group consisting of ethylene polymer and wax.
Claim 6
Dependent Claim
20 words
The method according to claim 1, wherein in step (c) a wetting agent is mixed into said sphericalized metal powder.
Claim 7
Dependent Claim
18 words
The method according to claim 5, wherein in step (d) the mixture is kneaded in a planetary mixer.
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) | 1995-03-10 | 1995-09-09 | 1996-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-10 | 1999-09-09 | 2000-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-10 | 2003-09-09 | 2004-03-10 | $7700.00 | Window Closed / Lapsed |