US4483905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Homogeneous iron based powder mixtures free of segregation
Assignee: Hoeganaes Corp
•
Filing: 1981-02-20
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Granted: 1984-11-20
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Expires: 2001-02-20
Abstract
Abstract A metal powder containing particles of iron or steel and particles of an alloying element is apt to segregation and dusting. It has now been found that segregation and dusting can be reduced or eliminated if the powder contains a binding agent in solid or liquid state. It is preferred to add to the metal powder one of the agents polyethylene glycol, polypropylene glycol, glycerine, and polyvinyl alcohol, in a quantity of 0.005-0.2 percent by weight.
Inventors
- 👤 Ulf F. I. Engstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:25
CPC Classifications
B; B22; B22F; B22F1/00; B22F1/10; B22F1/14; B22F1/148; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12181
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
In a non-compacted powder composition formed by mechanical mixing primarily comprising an iron-based powder selected from the group consisting of iron and steel powder together with a minor amount of at least one alloying powder, the improvement wherein said composition further comprises in intimate contact with said iron-based powder and said at least one alloying powder from 0.005 to 1.0 percent by weight of a binding agent in solid or liquid state for said iron-based powder and said alloying powder whereby segregation and/or dusting of the iron-based powder and said at least one alloying powder is essentially precluded, with said mechanical mixing used to form said composition having been conducted while said binding agent is provided as a liquid.
Claim 2
Dependent Claim
119 words
In a non-compacted powder composition formed by mechanical mixing primarily comprising an iron-based powder selected from the group consisting of iron and steel powder together with a minor amount of at least one alloying powder, the improvement wherein said composition further comprises in intimate contact with said iron-based powder and said at least one alloying powder from 0.005 to 1.0 percent by weight of a binding agent in solid or liquid state for said iron-based powder and said alloying powder whereby segregation and/or dusting of the iron-based powder and said at least one alloying powder is essentially precluded, with said mechanical mixing used to form said composition having been conducted while said binding agent is provided as a liquid.
Claim 3
Dependent Claim
21 words
The non-compacted powder composition of claim 1, wherein the composition comprises from 0.005 to 0.2 weight percent of the binding agent.
Claim 4
Dependent Claim
26 words
The non-compacted powder composition of claim 1, wherein the binding agent is selected from the group consisting of polyethylene glycol, polypropylene glycol, glycerine and polyvinyl alcohol.
Claim 5
Dependent Claim
26 words
The non-compacted powder composition of claim 2, wherein the binding agent is selected from the group consisting of polyethylene glycol, polypropylene glycol, glycerine and polyvinyl alcohol.
Claim 6
Dependent Claim
19 words
The non-compacted powder composition of claim 1, wherein the amount of alloying powder comprises about 3 percent by weight.
Claim 7
Dependent Claim
12 words
The non-compacted powder composition of claim 1, wherein said composition is free-flowing.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |