US4077109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot working of metal powders
Assignee: Huntington Alloys Corp
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Filing: 1976-05-10
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Granted: 1978-03-07
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Expires: 1996-05-10
Abstract
Abstract Metal powders are hot isostatically pressed in a can or container produced from superplastic metal sheet.
Inventors
- 👤 Jay Michael Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:44
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/12; B22F3/1208; B22F3/1258; B22F3/1216; Y; Y10; Y10S; Y10S29/00; Y10S29/031; Y10T; Y10T29/00; Y10T29/49; Y10T29/49805
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
134 words
In the process for producing consolidated metal articles by hot pressing metal powders isostatically wherein metal powder to be hot pressed is contained in a metal container and the resulting assembly is subjected to a combination of an elevated temperature and fluid pressure sufficient to hot press said metal powder the improvements comprising forming said metal container by welding together elements of superplastic metal sheet, placing the resulting weldment within a mold having the desired container shape, inflating the weldment within said mold using low internal pressure at the superplastic forming temperature for said superplastic metal while restraining substantial movement of the weld metal, whereby fracture of said weld is avoided, and thereafter introducing metal powder into the container and isostatically hot pressing the metal powder in the welded and inflated superplastic metal container.
Claim 2
Dependent Claim
134 words
In the process for producing consolidated metal articles by hot pressing metal powders isostatically wherein metal powder to be hot pressed is contained in a metal container and the resulting assembly is subjected to a combination of an elevated temperature and fluid pressure sufficient to hot press said metal powder the improvements comprising forming said metal container by welding together elements of superplastic metal sheet, placing the resulting weldment within a mold having the desired container shape, inflating the weldment within said mold using low internal pressure at the superplastic forming temperature for said superplastic metal while restraining substantial movement of the weld metal, whereby fracture of said weld is avoided, and thereafter introducing metal powder into the container and isostatically hot pressing the metal powder in the welded and inflated superplastic metal container.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein the superplastic metal is selected from the group consisting of a superplastic stainless steel, a superplastic nickel-chromium-iron alloy and a superplastic alloy steel.
Claim 4
Dependent Claim
26 words
The process of claim 2 wherein rotational movement of the superplastic material about the centerline of the weld is restrained so as not to exceed 90°.
Claim 5
Dependent Claim
13 words
The process of claim 3 wherein said rotational movement does not exceed 45°.
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) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |