Patent US4404023A successfully refreshed from Google Patents.
US4404023A
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Process for the production of a metal or metal alloy powder
Assignee: Eckart Werk Standard Bronzepulver Werke Carl Eckart GmbH and Co
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Filing: 1982-03-30
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Granted: 1983-09-13
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Expires: 2002-03-30
Abstract
Abstract A process for the production of a metal or metal alloy powder with flake-shaped particles comprises mechanically crushing a ductile starting material. A foreign substance which forms a separate phase between the crystallites of the starting material is added thereto to facilitate crushing the starting material, while retaining the original workability thereof.
Inventors
- 👤 Wolfgang Gluck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:06
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
72 words
A process for the production of a metal powder having flake-like particles comprising mechanically grinding a ductile starting material and putting the material into flake form, wherein the starting material includes a foreign substance as an intermediate substance which at the temperatures occurring in the flake-forming process occurs substantially only at the boundary surfaces of the crystallites of the starting material, in order thereby to improve the crushability of the starting material.
Claim 2
Dependent Claim
72 words
A process for the production of a metal powder having flake-like particles comprising mechanically grinding a ductile starting material and putting the material into flake form, wherein the starting material includes a foreign substance as an intermediate substance which at the temperatures occurring in the flake-forming process occurs substantially only at the boundary surfaces of the crystallites of the starting material, in order thereby to improve the crushability of the starting material.
Claim 3
Dependent Claim
23 words
A process as set forth in claim 1 wherein said starting material is a metal alloy, thereby to produce a metal alloy powder.
Claim 4
Dependent Claim
22 words
A process as set forth in claim 1 wherein the flake-forming operation is effected at the same time as the crushing operation.
Claim 5
Dependent Claim
19 words
A process as set forth in claim 1 wherein the flake-forming operation is effected as a separate mechanical operation.
Claim 6
Dependent Claim
23 words
A process as set forth in claim 1 wherein the proportion of foreign substance in the starting material is from 0.1 to 5%.
Claim 7
Dependent Claim
23 words
A process as set forth in claim 1 wherein the proportion of foreign substance in the starting material is from 1 to 2%.
Claim 8
Dependent Claim
14 words
A process as set forth in claim 1 wherein said foreign substance comprises bismuth.
Claim 9
Dependent Claim
14 words
A process as set forth in claim 1 wherein said foreign substance comprises antimony.
Claim 10
Dependent Claim
20 words
A process as set forth in claim 1 wherein said starting material comprises brass and said foreign substance comprises bismuth.
Claim 11
Dependent Claim
20 words
A process as set forth in claim 1 wherein said starting material comprises brass and said foreign substance comprises antimony.
Claim 12
Dependent Claim
20 words
A process as set forth in claim 1, wherein said starting material comprises copper and said foreign substance comprises bismuth.
Claim 13
Dependent Claim
20 words
A process as set forth in claim 1 wherein said starting material comprises aluminium and said foreign substance comprises antimony.
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) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |