US3798740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of extruding a porous compacted mass of metal powder having a sealed outer surface
Assignee: Davy Ashmore Ltd
•
Filing: 1972-10-02
•
Granted: 1974-03-26
•
Expires: 1992-10-02
Abstract
Abstract In an extrusion process a mass of metal particles is subjected to pressure, e.g., isostatic pressure in order to compact the powder but to less than fully dense condition. The outer surface of the compact so formed is sealed with a material conveniently glass and the compact is then heated and extruded under pressure through a die. As alternatives to the use of glass as the sealing material salt, or a fine powder of a ductile metal may be used.
Inventors
- 👤 F Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:25
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/20; Y; Y10; Y10S; Y10S29/00; Y10S29/031; Y10S29/047; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982; Y10T29/49986
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
62 words
In an extrusion process wherein a mass of metal powder is subjected to pressure in order to compact the powder but to less than fully dense condition, the improvement comprising sealing the outer surface of the compact so formed by depositing thereon a layer of glass prior to extruding the sealed compact under pressure and at an elevated temperature through a die.
Claim 2
Dependent Claim
62 words
In an extrusion process wherein a mass of metal powder is subjected to pressure in order to compact the powder but to less than fully dense condition, the improvement comprising sealing the outer surface of the compact so formed by depositing thereon a layer of glass prior to extruding the sealed compact under pressure and at an elevated temperature through a die.
Claim 3
Dependent Claim
43 words
An extrusion process as claimed in claim 1 in which the powder is compacted by placing the powder in a closed bag of rubber or other elastomeric material and subjecting the powder within the bag to pressure in a cold isostatic compaction process.
Claim 4
Dependent Claim
17 words
An extrusion process as claimed in claim 1 in which the glass is sprayed onto the compact.
Claim 5
Dependent Claim
25 words
An extrusion process as claimed in claim 1 in which the glass is formed on the compact by dipping the compact into a softened glass.
Claim 6
Dependent Claim
43 words
An extrusion process as claimed in claim 2 in which a glass slip is sprayed onto the internal surface of the bag before the metal powder is introduced into the bag, the glass slip serving as the sealant of the powder when compacted.
Claim 7
Dependent Claim
25 words
An extrusion process as claimed in claim 5 in which the glass slip comprises a mixture of two different powdered glasses in a liquid vehicle.
Claim 8
Dependent Claim
65 words
In an extrusion process wherein a mass of metal powder is subjected to pressure in order to compact the powder but to less than fully dense condition, the improvement comprising sealing the outer surface of the compact so formed by depositing thereon a layer of sealant material prior to heating the compact and extruding it under pressure and at an elevated temperature through a die.
Claim 9
Dependent Claim
65 words
In an extrusion process wherein a mass of metal powder is subjected to pressure in order to compact the powder but to less than fully dense condition, the improvement comprising sealing the outer surface of the compact so formed by depositing thereon a layer of sealant material prior to heating the compact and extruding it under pressure and at an elevated temperature through a die.
Claim 10
Dependent Claim
26 words
An extrusion process as claimed in claim 7 in which the outer surface of the compact is sealed by a fine powder of a ductile metal.
Claim 11
Dependent Claim
60 words
An extrusion process comprising subjecting a mass of metal powder to pressure sufficient to compact the powder to less than fully dense condition, depositing a layer of sealant material on the outer surface of the resulting compact, heating the compact with the sealant layer thereon, and then extruding the compact under pressure and at an elevated temperature through a die.
Claim 12
Dependent Claim
60 words
An extrusion process comprising subjecting a mass of metal powder to pressure sufficient to compact the powder to less than fully dense condition, depositing a layer of sealant material on the outer surface of the resulting compact, heating the compact with the sealant layer thereon, and then extruding the compact under pressure and at an elevated temperature through a die.
Claim 13
Dependent Claim
43 words
An extrusion process as claimed in claim 9 in which the powder is compacted by placing the powder in a closed bag of rubber or other elastomeric material and subjecting the powder within the bag to pressure in a cold isostatic compaction process.
Claim 14
Dependent Claim
21 words
An extrusion process as claimed in claim 9 in which the sealant is a layer of glass deposited on the compact.
Claim 15
Dependent Claim
24 words
An extrusion process as claimed in claim 1 in which the glass comprises a mixture of two different powdered glasses in a liquid vehicle.
References Cited (Backward Citations)
US2932882A
Cited
GB812819A
Cited
US3076916A
Cited
US3390985A
Cited
US3648343A
Cited
US3689964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |