US4485080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of diamond powder
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1983-12-12
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Granted: 1984-11-27
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Expires: 2003-12-12
Abstract
Abstract Diamond powder is produced without using an ultra-high pressure apparatus by a process comprising melting carbon and a metal capable of dissolving carbon to form a liquid, subjecting the liquid to quenching at an ultra-high cooling rate to form an amorphous metal, heating the amorphous metal at a predetermined temperature to precipitate diamond crystals from the amorphous metal and then separating the phase of the amorphous metal other than the diamond to obtain diamond powder.
Inventors
- 👤 Hideo Shingu
- 👤 Keiichi Ishihara
- 👤 Akira Doi
- 👤 Naoji Fujimori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:29
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/25; C01B32/26
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
96 words
A process for the production of diamond powder, which process comprises (A) a step of melting carbon and at least one metal capable of containing carbon as a solid solution to form a liquid, (B) a step of subjecting the liquid to rapid solidification to form an amorphous metal or alloy, (C) a step of heating the amorphous metal or alloy at a predetermined temperature to precipitate diamond from the amorphous metal or alloy and (D) a step of separating the phase of the amorphous metal or alloy other than the diamond to obtain diamond powder.
Claim 2
Dependent Claim
96 words
A process for the production of diamond powder, which process comprises (A) a step of melting carbon and at least one metal capable of containing carbon as a solid solution to form a liquid, (B) a step of subjecting the liquid to rapid solidification to form an amorphous metal or alloy, (C) a step of heating the amorphous metal or alloy at a predetermined temperature to precipitate diamond from the amorphous metal or alloy and (D) a step of separating the phase of the amorphous metal or alloy other than the diamond to obtain diamond powder.
Claim 3
Dependent Claim
20 words
The process of claim 1, wherein the metal is selected from the group consisting of iron, nickel, cobalt and chromium.
Claim 4
Dependent Claim
28 words
The process of claim 1, wherein the metal further contains at least one element selected from the group consisting of silicon, germanium, boron, phosphorus, manganese, aluminum and lead.
Claim 5
Dependent Claim
20 words
The process of claim 1, wherein the melting is carried out at a temperature of higher than the melting point.
Claim 6
Dependent Claim
21 words
The process of claim 1, wherein the rapid solidification is carried out at a rate of 1×10 4 °K/sec or more.
Claim 7
Dependent Claim
19 words
The process of claim 1, wherein the heating is carried out at a temperature of at least 100° C.
Claim 8
Dependent Claim
22 words
The process of claim 1, wherein the separating is carried out by dissolving the amorphous metal or alloy in an alkali acid.
Claim 9
Dependent Claim
24 words
The process of claim 1, wherein the separating is carried out by grinding finely the amorphous metal or alloy and subjecting to gravity concentration.
Claim 10
Dependent Claim
16 words
The process of claim 7, wherein the dissolving is carried out by the aid of electrolysis.
Claim 11
Dependent Claim
18 words
The process of claim 1, wherein the quenching is carried out by pouring the liquid into cooled rolls.
Claim 12
Dependent Claim
23 words
The process of claim 1, wherein the quenching is carried out by spraying the liquid from a nozzle to a cooled revolving disk.
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) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |