US5066515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artificial diamond forming method
Assignee: Mitsubishi Materials Corp
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Filing: 1990-07-16
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Granted: 1991-11-19
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Expires: 2010-07-16
Abstract
Abstract A method of forming an artificial diamond, comprising applying a laser beam to a glassy solid carbon material, while moving a point on the glassy solid carbon material at which the laser beam is applied, to form a locally fused portion thereon, whereby every part of the locally fused portion is cooled as the point moves away therefrom. During cooling of the locally fused portion, an artificial diamond is formed in adjacent regions on both sides of the solidified locally fused portion.
Inventors
- 👤 Yuzoh Ohsawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:01
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/25; C01B32/26
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
171 words
A method of forming an artificial diamond, comprising applying a laser beam to an outer surface of a glassy solid carbon material formed of hard carbon formed from an organic substance by solid-phase thermal decomposition thereof, while moving a point at which said laser beam is applied on said outer surface of said glassy solid carbon material so as to cause an outer surface portion of said glassy solid carbon material to be locally fused, to form pools of fused carbon, whereby each of said pools is cooled and solidified as said point moves away therefrom to form an artificial diamond, said laser beam being a carbonic acid gas laser beam and being applied to said outer surface of said glassy solid carbon material in an atmospheric gas flow at a pressure of 200 to 1000 torr at an output density of 1×10 6 to 8×10 6 W/cm 2 , said atmospheric gas being a gas selected from the group consisting of He, Ar, N 2 , and H 2 .
Claim 2
Independent Claim
171 words
A method of forming an artificial diamond, comprising applying a laser beam to an outer surface of a glassy solid carbon material formed of hard carbon formed from an organic substance by solid-phase thermal decomposition thereof, while moving a point at which said laser beam is applied on said outer surface of said glassy solid carbon material so as to cause an outer surface portion of said glassy solid carbon material to be locally fused, to form pools of fused carbon, whereby each of said pools is cooled and solidified as said point moves away therefrom to form an artificial diamond, said laser beam being a carbonic acid gas laser beam and being applied to said outer surface of said glassy solid carbon material in an atmospheric gas flow at a pressure of 200 to 1000 torr at an output density of 1×10 6 to 8×10 6 W/cm 2 , said atmospheric gas being a gas selected from the group consisting of He, Ar, N 2 , and H 2 .
Claim 3
Dependent Claim
20 words
The method as claimed in claim 1, wherein said laser beam is continuously applied to form a continuous fused portion.
Claim 4
Dependent Claim
19 words
The method as claimed in claim 1, wherein said laser beam is intermittently applied to form discontinuous fused portions.
Claim 5
Dependent Claim
26 words
The method as claimed in claim 1, wherein said point is moved by moving said glassy solid carbon material while said laser beam is held stationary.
Claim 6
Dependent Claim
26 words
The method as claimed in claim 1, wherein said point is moved by moving said laser beam while said glassy solid carbon material is held stationary.
Claim 7
Dependent Claim
29 words
The method as claimed in claim 1, wherein said point is moved by moving both of said glassy solid carbon material and said laser beam, relative to each other.
Claim 8
Dependent Claim
20 words
The method as claimed in claim 1, wherein said atmospheric gas is supplied at a flow rate of 3.0 l/min.
Claim 9
Dependent Claim
39 words
The method as claimed in claim 1, wherein said point is moved in two directions orthogonal to each other at a speed of 2 to 5 cm/min in one direction and 0.2 to 0.5 cm/min in the other direction.
Claim 10
Dependent Claim
20 words
The method as claimed in claim 8, wherein said atmospheric gas is supplied at a flow rate of 3.0 l/minute.
Claim 11
Dependent Claim
20 words
The method as claimed in claim 4, wherein said atmospheric gas is supplied at a flow rate of 3.0 l/minute.
Claim 12
Dependent Claim
20 words
The method as claimed in claim 5, wherein said atmospheric gas is supplied at a flow rate of 3.0 l/minute.
Claim 13
Dependent Claim
20 words
The method as claimed in claim 6, wherein said atmospheric gas is supplied at a flow rate of 3.0 l/minute.
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) | 1994-11-18 | 1995-05-20 | 1995-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-18 | 1999-05-20 | 1999-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-18 | 2003-05-20 | 2003-11-19 | $7700.00 | Window Closed / Lapsed |