US4435342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for producing very fine particle size metal powders
Assignee: Individual
•
Filing: 1981-11-04
•
Granted: 1984-03-06
•
Expires: 2001-11-04
Abstract
Abstract A method is provided for producing ultra fine particles of metal by delivering a molten stream of metal onto a rotating primary annular surface, discharging molten fine droplets from the edge of the primary annular surface against an inclined secondary annular surface surrounding the primary surface at an angle such that the molten droplets striking the secondary surface are sub-divided and discharged from the secondary surface to be cooled and collected as ultra fine particles.
Inventors
- 👤 Jospeh M. Wentzell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:20
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/06; B22F9/08; B22F9/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
150 words
A method of producing ultra fine solid metal particles comprising the steps of: (a) discharging droplets of molten metal from a rotating primary member having a substantially circular periphery in a generally radial path from said rotating member tangentially against a spaced secondary annular planar surface surrounding and spaced from the periphery of the rotating primary member, said annular planar surface being inclined to the path of the droplets of molten metal from the rotating member at an angle such that the droplets are free from any tendency for the metal to stick to said annular planar surface and such that the molten droplets are further atomized into finer droplets which continue tangentially beyond said secondary annular surface into a cooling environment; (b) cooling said finer droplets in said cooling environment to solidify the droplets to solid particles; and (c) collecting said cooled particles as ultra fine solid metal particles.
Claim 2
Independent Claim
150 words
A method of producing ultra fine solid metal particles comprising the steps of: (a) discharging droplets of molten metal from a rotating primary member having a substantially circular periphery in a generally radial path from said rotating member tangentially against a spaced secondary annular planar surface surrounding and spaced from the periphery of the rotating primary member, said annular planar surface being inclined to the path of the droplets of molten metal from the rotating member at an angle such that the droplets are free from any tendency for the metal to stick to said annular planar surface and such that the molten droplets are further atomized into finer droplets which continue tangentially beyond said secondary annular surface into a cooling environment; (b) cooling said finer droplets in said cooling environment to solidify the droplets to solid particles; and (c) collecting said cooled particles as ultra fine solid metal particles.
Claim 3
Dependent Claim
33 words
A method of producing ultra fine solid metal particles as claimed in claim 1 wherein the rotating primary member is a rotating disc onto which is vertically directed a stream of molten metal.
Claim 4
Dependent Claim
15 words
A method as claimed in claim 2 wherein the rotating disc has a concave shape.
Claim 5
Dependent Claim
22 words
A method as claimed in claim 1 wherein the rotating primary member is a rotating metal electrode whose end is being melted.
Claim 6
Dependent Claim
26 words
A method as claimed in claim 1 or 2 or 4 or 3 wherein the secondary annular surface is rotated counter to the rotating primary member.
Claim 7
Dependent Claim
29 words
A method as claimed in claim 1 or 2 or 4 or 3 wherein the secondary annular surface is rotated in the same direction as the rotating primary member.
Claim 8
Dependent Claim
32 words
A method as claimed in claim 1 or 2 or 4 or 3 wherein the secondary annular surface is vibrated vertically in the path of the molten droplets from the primary member.
Claim 9
Independent Claim
24 words
A method as claimed in claims 1 or 2 or 4 or 3 wherein the secondary annular surface is heated to an elevated temperature.
Claim 10
Independent Claim
29 words
A method as claimed in claims 1 or 2 or 4 or 3 wherein the molten metal is teemed onto said primary annular surface off-center of said primary surface.
Claim 11
Dependent Claim
23 words
A method as claimed in claim 8 wherein the molten metal is teemed onto said primary annular surface off-center of said primary surface.
Claim 12
Dependent Claim
23 words
A method as claimed in claim 9 wherein the molten metal is teemed onto said primary annular surface off-center of said primary surface.
Claim 13
Dependent Claim
23 words
A method as claimed in claim 3 wherein the molten metal is teemed onto said primary annular surface off-center of said primary surface.
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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |