Patent US3757410A successfully refreshed from Google Patents.
US3757410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for extruding metal powder to produce a continuous rod
Assignee: Treadwell Corp
•
Filing: 1971-01-27
•
Granted: 1973-09-11
•
Expires: 1991-01-27
Abstract
Abstract There is disclosed an apparatus for the continuous extrusion of copper rod from copper powder in a manner which prevents harmful deterioration of the compacting cylinder and requires the expenditure of less power to operate.
Inventors
- 👤 E Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:20
CPC Classifications
B; B21; B21C; B21C23/00; B21C23/002; B22; B22F; B22F3/00; B22F3/20; Y; Y10; Y10S; Y10S29/00; Y10S29/031; Y10S29/047
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
60 words
The apparatus of claim 1 wherein said atmosphere is hydrogen gas and wherein the apparatus further includes mill means for receiving briquettes and like consolidated masses of metal powder for conversion in the presence of hydrogen gas into powder form, and feeder means for receiving said powder and for discharging a measured quantity of metal powder into said compacting chamber.
Claim 2
Independent Claim
74 words
A method of extruding a metal powder in the form of a continuous dense solid elongated shape which comprises flowing a charge of metal powder in a protective gaseous atmosphere into an extrusion chamber, the gaseous atmosphere being substantially completely evaucated from said chamber, compacting the powder by compressing it towards an extrusion die and then extruding the compacted mass from said chamber through said die by pressing the extrusion die into the mass.
Claim 3
Dependent Claim
18 words
The method according to claim 3 wherein the residual gaseous atmosphere in the evacuated extrusion chamber is non-oxidizing.
Claim 4
Dependent Claim
11 words
The method according to claim 4 wherein the gas is hydrogen.
Claim 5
Independent Claim
120 words
The method of extruding a metal powder in the form of a continuous dense solid elongated rod which comprises the steps of: maintaining an atmosphere whch is substantially inert with respect to a metal to be converted to powder in a mill, converting said metal into a powder in the presence of said atmosphere, accumulating said powder in a collector in continued presence of said atmosphere, evacuating said collector and extrusion chamber connected thereto to leave only a residual atmosphere, flowing a charge of metal powder into said extrusion chamber, compacting said powder by compressing it towards an extrusion die and then extruding the compacted mass from said chamber through said die by passing the extrusioN die into said mass.
Claim 6
Dependent Claim
18 words
The method according to claim 6 wherein the residual gaseous atmosphere in the evacuated extrusion chamber is non-oxidizing.
Claim 7
Dependent Claim
11 words
The method according to claim 7 wherein the gas is hydrogen.
References Cited (Backward Citations)
US1174646A
Cited
US2902714A
Cited
US3060560A
Cited
US2964177A
Cited
US3293006A
Cited
US3189988A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |