Patent USRE31902E successfully refreshed from Google Patents.
USRE31902E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersion strengthened metals
Assignee: SCM Metal Products Inc
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Filing: 1983-12-27
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Granted: 1985-05-28
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Expires: 2003-12-27
Abstract
Abstract A process for dispersion strengthing of atomized alloy particles by internal oxidation is substantially improved by providing atomized particles substantially free of oxide surface film to enhance the efficiency of the internal oxidation step. The atomized alloy particles can be produced by dry collection to prevent oxide film formation, or alternatively, the oxide surface film can be removed by mechanical action removal or by chemical leaching.
Inventors
- 👤 Anil V. Nadkarni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:18
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/06; B22F9/08; C; C22; C22C; C22C1/00; C22C1/10; C22C1/1078; C22C32/00; C22C32/001; C22C32/0015; C22C32/0021
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
52 words
In a process for dispersion-strengthening atomized alloy particles having an average particle size less than about 300 microns by internally oxidizing said alloy particles, the improvement comprising: providing atomized .Iadd.copper/aluminum .Iaddend.alloy particles being substantially free of oxide surface film whereby said alloy is internally oxidized without obstruction of the oxide surface film.
Claim 2
Dependent Claim
52 words
In a process for dispersion-strengthening atomized alloy particles having an average particle size less than about 300 microns by internally oxidizing said alloy particles, the improvement comprising: providing atomized .Iadd.copper/aluminum .Iaddend.alloy particles being substantially free of oxide surface film whereby said alloy is internally oxidized without obstruction of the oxide surface film.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein the atomized particles are dry collected within an inert gas or liquid to prevent oxide surface film formation on the atomized particles.
Claim 4
Dependent Claim
15 words
The process in claim 2 wherein the atomized particles are dry collected within helium gas.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein the atomized alloy particles are subjected to mechanical working to mechanically remove the oxide surface film.
Claim 6
Dependent Claim
12 words
The process in claim 4 wherein the mechanical working is ball milling.
Claim 7
Dependent Claim
11 words
The process in claim 4 wherein the mechanical working is grinding.
Claim 8
Dependent Claim
11 words
The process in claim 4 wherein the mechanical working is flaking.
Claim 9
Dependent Claim
15 words
The process in claim 1 wherein the oxide surface film is removed by chemical leaching.
Claim 10
Dependent Claim
13 words
The process in claim 8 wherein the chemical leaching agent is nitric acid.
Claim 11
Dependent Claim
13 words
The process in claim 8 wherein the chemical leaching agent is ammonium hydroxide.
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) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |