Patent US4756746A successfully refreshed from Google Patents.
US4756746A
Expired / Lapsed
US
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Process of producing fine spherical particles
Assignee: Osram Sylvania Inc
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Filing: 1986-09-08
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Granted: 1988-07-12
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Expires: 2006-09-08
Abstract
Abstract A powdered material and a process for producing the material are disclosed. The powdered material consists essentially of spherical particles selected from the group consisting of metals, metal alloys, ceramic glasses, crystalline ceramic materials, and combinations of these. The material is essentially free of elliptical shaped material and elongated particles having rounded ends. The material has a particle size of less than about 20 micrometers. The process for making the spherical particles involves mechanically reducing the size of a starting material to produce a finer powder the major portion of which has a particle size of less than about 20 micrometers. The finer powder is entrained in a carrier gas and passed through a high temperature zone at a temperature above the melting point of the powder to melt at least about 50% of the powder and form the spherical particles of the melted portion. The powder is then directly solidifed.
Inventors
- 👤 Preston B. Kemp, Jr.
- 👤 Walter A. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:09
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/653; B; B22; B22F; B22F1/00; B22F1/06; B22F1/065; C03; C03B; C03B19/00; C03B19/10; C03B19/1005; C03B19/102; C03B19/1025; Y; Y10; Y10S; Y10S75/00; Y10S75/953
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
171 words
A process for producing fine spherical powder particles, said process comprising: (a) mechanically reducing the size of the starting material from which said powder is to be made to produce a finer powder, the major portion of which has a particle size of less than about 20 micrometers; (b) entraining said finer powder in a carrier gas and passing said powder through a high temperature zone at a temperature above the melting point of said finer powder, said temperature being from about 5500° C. to about 17,000° C., said temperature being created by a plasma jet, to melt at least about 50% by weight of said finer powder to form essentially fine spherical particles of said melted portion; and (c) rapidly and directly resolidifying the resulting high temperature treated material, while said material is in flight, to form fine spherical particles having a particle size of less than about 20 micrometers in diameter, said particles being essentially free of elliptical shaped material and essentially free of elongated particles having rounded ends.
Claim 2
Dependent Claim
171 words
A process for producing fine spherical powder particles, said process comprising: (a) mechanically reducing the size of the starting material from which said powder is to be made to produce a finer powder, the major portion of which has a particle size of less than about 20 micrometers; (b) entraining said finer powder in a carrier gas and passing said powder through a high temperature zone at a temperature above the melting point of said finer powder, said temperature being from about 5500° C. to about 17,000° C., said temperature being created by a plasma jet, to melt at least about 50% by weight of said finer powder to form essentially fine spherical particles of said melted portion; and (c) rapidly and directly resolidifying the resulting high temperature treated material, while said material is in flight, to form fine spherical particles having a particle size of less than about 20 micrometers in diameter, said particles being essentially free of elliptical shaped material and essentially free of elongated particles having rounded ends.
Claim 3
Dependent Claim
24 words
A process of claim 1 wherein the size of said starting material is reduced by attritor milling said material to produce said finer powder.
Claim 4
Dependent Claim
26 words
A process of claim 1 wherein after said resolidification, said high temperature treated material is classified to obtain the desired particle size of said spherical particles.
Claim 5
Dependent Claim
27 words
A process of claim 1 wherein said starting material is selected from the group consisting of metals, metal alloys, ceramic glasses, crystalline ceramic materials, and combinations thereof.
Claim 6
Dependent Claim
20 words
A process of claim 4 wherein said starting material is selected from the group consisting of metals and metal alloys.
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) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |