Patent US5741252A successfully refreshed from Google Patents.
US4604259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making copper-rich metal shapes by powder metallurgy
Assignee: SCM Metal Products Inc
•
Filing: 1985-09-19
•
Granted: 1986-08-05
•
Expires: 2005-09-19
Abstract
Abstract A copper-rich metal shape is produced by forming a coherent forerunner shape consisting essentially of cupreous powder, said powder containing a proportion of copper oxide sufficient for facilitating the obtaining of a high sinter density in sintered porous mass, and in a reducing atmosphere at temperature that will sinter copper present, converting said forerunner shape into a porous sintered mass virtually devoid of copper oxide. Said porous mass can be worked so virtually full density if desired.
Inventors
- 👤 Charles I. Whitman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:14
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/0425; B; B22; B22F; B22F3/00; B22F3/001
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
112 words
A process for the production of a metal shape which comprises the steps of: (a) forming a coherent forerunner shape consisting essentially of cupreous powder containing at least about 80% by weight of copper oxide and from 1% to 20% by weight of a fugitive binder, (b) contacting said forerunner shape with a reducing atmosphere, and (c) elevating the temperature of said shape in said atmosphere to from about 760° C. to a temperature below the melting point of copper, whereby said binder is removed, the copper oxide is reduced to copper metal and the copper metal is sintered to form a porous sintered mass of copper substantially free of copper oxide.
Claim 2
Dependent Claim
112 words
A process for the production of a metal shape which comprises the steps of: (a) forming a coherent forerunner shape consisting essentially of cupreous powder containing at least about 80% by weight of copper oxide and from 1% to 20% by weight of a fugitive binder, (b) contacting said forerunner shape with a reducing atmosphere, and (c) elevating the temperature of said shape in said atmosphere to from about 760° C. to a temperature below the melting point of copper, whereby said binder is removed, the copper oxide is reduced to copper metal and the copper metal is sintered to form a porous sintered mass of copper substantially free of copper oxide.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the forerunner shape is heated gradually to a temperature of about 760°-1075° in the presence of molecular hydrogen reductant.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein said temperature is about 950°-1010°.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein said copper oxide consists essentially of cuprous oxide.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein said binder constitutes not substantially more than about 5% by weight of said forerunner shape.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein said forerunner shape contains elemental copper.
Claim 8
Dependent Claim
11 words
The process of claim 1 wherein said binder comprises a polymer.
Claim 9
Dependent Claim
16 words
The process of claim 1 wherein said porous sintered mass is worked to substantially full density.
Claim 10
Dependent Claim
13 words
A porous elemental copper-rich shape, the product of the process of claim 1.
Claim 11
Dependent Claim
12 words
A substantially fully dense elemental copper-rich shape, the product of claim 8.
References Cited (Backward Citations)
US4315777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |