US4376740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production fine metal particles
Assignee: National Institute for Materials Science
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Filing: 1981-01-05
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Granted: 1983-03-15
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Expires: 2001-01-05
Abstract
Abstract A process for producing fine particles of a metal or alloy, which comprises contacting a molten metal or alloy with activated hydrogen gas thereby to release fine particles of the metal or alloy having a diameter of less than 10 microns from the molten metal or alloy.
Inventors
- 👤 Masahiro Uda
- 👤 Satoru Ohno
- 👤 Tsutomu Hoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:37
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/06; B22F9/08; B22F9/082; B22F9/14; B22F2009/0836; B22F2009/084; B22F2009/0848; B22F2999/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
A process for producing solid particles of a metal or alloy, comprising: a. directing a stream of activated hydrogen gas or a mixture of at least 20 percent by volume of activated hydrogen gas and up to 80 percent by volume of at least one gas selected from the group consisting of argon and helium, onto a mass of molten metal or alloy to subdivide said mass into particles of said metal or alloy having a diameter of less than 5 microns, and b. cooling and collecting said particles.
Claim 2
Dependent Claim
89 words
A process for producing solid particles of a metal or alloy, comprising: a. directing a stream of activated hydrogen gas or a mixture of at least 20 percent by volume of activated hydrogen gas and up to 80 percent by volume of at least one gas selected from the group consisting of argon and helium, onto a mass of molten metal or alloy to subdivide said mass into particles of said metal or alloy having a diameter of less than 5 microns, and b. cooling and collecting said particles.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the activated hydrogen gas is generated by heating hydrogen by means of a high-temperature plasma.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the activated hydrogen gas is generated by heating hydrogen by means of a low-temperature plasma.
Claim 5
Dependent Claim
84 words
The process of claim 1, further comprising: melting said metal or alloy by an arc discharge in a closed chamber having a gas feed port and a gas discharge port, introducing hydrogen gas into said closed chamber through said gas feed port to make contact with the arc and with said mass of molten metal or alloy, and drawing off said hydrogen gas from said closed chamber to carry away said particles of metal or alloy with said hydrogen gas from said closed chamber.
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) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |