Patent US5442733A successfully refreshed from Google Patents.
Patent US4927619A successfully refreshed from Google Patents.
US4927619A
Expired / Lapsed
US
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Diamond single crystal
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1988-10-11
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Granted: 1990-05-22
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Expires: 2008-10-11
Abstract
Abstract An artificial diamond single crystal, at least a part of a surface of the crystal having a rough surface which diffusibly reflects light which is formed by suppressing crystal growth at that surface, and wherein said diamond single crystal is obtained by: providing a diamond synthesis reaction system comprised of a reaction chamber housing having positioned therein a carbon source and a solvent metal arranged in contact with the said carbon source, said reaction system being arranged in a pressure medium; providing a seed crystal in the reaction chamber; providing temperatures of from about 1300° to 1600° C. and pressure of from about 50 to 60 Kb in the reaction chamber which permit diamond to be maintained thermodynamically stable in the reaction chamber housing; heating the reaction chamber to provide a temperature gradient in such a way that a portion of the solvent metal in contact with the carbon source is higher in temperature than a portion of the solvent metal in contact with the seed crystal so as to migrate the carbon from the higher temperature portion to the lower temperature portion using the solvent metal as a medium; and allowing the carbon to precipitate and grow as a diamond on the seed crystal due to the difference in solubility caused by the temperature gradient in the reaction chamber housing; the crystal growth being maintained for about 10 to 100 hours until the crystal growth in the reaction chamber housing in at least one direction perpendicular to the direction of the temperature gradient reaches the contact surface of the solvent metal with the pressure medium having an irregular rough surface and thereby the crystal growth is suppressed at the surface of the pressure medium to thereby form an irregular rough surface on the crystal.
Inventors
- 👤 Kazuo Tsuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:24
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/02; B; B01; B01J; B01J3/00; B01J3/06; B01J3/062; C30B29/00; C30B29/02; C30B29/04; C30B9/00; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/061; B01J2203/062; B01J2203/0625; B01J2203/065; B01J2203/0655; B01J2203/0675; B01J2203/068
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
300 words
An artificial diamond single crystal, at least a part of a surface of the crystal having a rough surface which diffusibly reflects light which is formed by suppressing crystal growth at that surface, and wherein said diamond single crystal is obtained by a process consisting essentially of: providing a diamond synthesis reaction system comprised of a reaction chamber housing having positioned therein a carbon source and a solvent metal arranged in contact with the said carbon source, said reaction system being arranged in a pressure medium; providing a seed crystal in the reaction chamber; providing temperatures of from about 1300° to 1600° C. and pressure of from about 50 to 60 Kb in the reaction chamber which permit diamond to be maintained thermodynamically stable in the reaction chamber housing; heating the reaction chamber to provide a temperature gradient in such a way that a portion of the solvent metal in contact with the carbon source is higher in temperature than a portion of the solvent metal in contact with the seed crystal so as to migrate the carbon from the higher temperature portion to the lower temperature portion using the solvent metal as a medium; and allowing the carbon to precipitate and grow as a diamond on the seed crystal due to the difference in solubility caused by the temperature gradient in the reaction chamber housing; the crystal growth being maintained for about 10 to 100 hours until the crystal growth in the reaction chamber housing in at least one direction perpendicular to the direction of the temperature gradient reaches the contact surface of the solvent metal with the pressure medium having an irregular rough surface and thereby the crystal growth is suppressed at the surface of the pressure medium to thereby form an irregular rough surface on the crystal.
Claim 2
Dependent Claim
300 words
An artificial diamond single crystal, at least a part of a surface of the crystal having a rough surface which diffusibly reflects light which is formed by suppressing crystal growth at that surface, and wherein said diamond single crystal is obtained by a process consisting essentially of: providing a diamond synthesis reaction system comprised of a reaction chamber housing having positioned therein a carbon source and a solvent metal arranged in contact with the said carbon source, said reaction system being arranged in a pressure medium; providing a seed crystal in the reaction chamber; providing temperatures of from about 1300° to 1600° C. and pressure of from about 50 to 60 Kb in the reaction chamber which permit diamond to be maintained thermodynamically stable in the reaction chamber housing; heating the reaction chamber to provide a temperature gradient in such a way that a portion of the solvent metal in contact with the carbon source is higher in temperature than a portion of the solvent metal in contact with the seed crystal so as to migrate the carbon from the higher temperature portion to the lower temperature portion using the solvent metal as a medium; and allowing the carbon to precipitate and grow as a diamond on the seed crystal due to the difference in solubility caused by the temperature gradient in the reaction chamber housing; the crystal growth being maintained for about 10 to 100 hours until the crystal growth in the reaction chamber housing in at least one direction perpendicular to the direction of the temperature gradient reaches the contact surface of the solvent metal with the pressure medium having an irregular rough surface and thereby the crystal growth is suppressed at the surface of the pressure medium to thereby form an irregular rough surface on the crystal.
Claim 3
Dependent Claim
32 words
A diamond single crystal as claimed in claim 1, wherein the crystal has a length larger than the equivalent diameter of the cross section perpendicular to the longitudinal direction of the crystal.
Claim 4
Dependent Claim
33 words
A diamond single crystal as claimed in claim 1, wherein the crystal has a length of more than 1.5 equivalent diameters of the cross section perpendicular to the longitudinal direction of the crystal.
Claim 5
Dependent Claim
19 words
A diamond single crystal as claimed in claim 1, wherein the crystal has a length greater than 1 mm.
Claim 6
Dependent Claim
33 words
A diamond single crystal as claimed in claim 1, wherein the cross section of the crystal perpendicular to the longitudinal direction of the crystal has the shape of a circle or a polygon.
Claim 7
Dependent Claim
28 words
A diamond single crystal as claimed in claim 1, wherein the rough surface has a surface texture having a macro projection value of not more than 0.5 mm.
Claim 8
Dependent Claim
28 words
A diamond single crystal as claimed in claim 6, wherein the rough surface has a surface texture having a macro projection value of not more than 0.1 mm.
Claim 9
Dependent Claim
32 words
A diamond single crystal according to claim 1, wherein said pressure medium is comprised of a material selected from the group consisting of NaCl, Al 2 O 3 , MgO and hexagonal-BN.
Claim 10
Dependent Claim
28 words
A diamond single crystal according to claim 1, wherein said cross section is a polygonal cross section wherein at least one of the angles forms a circular arc.
Claim 11
Dependent Claim
21 words
A diamond single crystal according to claim 1, wherein said cross section is a triangle, or tetragon, or a star shape.
Claim 12
Dependent Claim
26 words
A diamond single crystal as claimed in claim 1, wherein the top face of the crystal has an index of a plane (100), (101) or (111).
Claim 13
Dependent Claim
36 words
A diamond single crystal as claimed in claim 1, wherein the rough surface comprises continuous irregular curvilinear convexes and cavities corresponding to the pressure medium surface structure formed under the conditions for producing the diamond crystal.
Claim 14
Dependent Claim
40 words
A diamond single crystal as claimed in claim 1, wherein the single crystal has the same cross-section in the shape and size thereof throughout the longitudinal direction of the crystal at which the side surface of the crystal is rough.
Claim 15
Dependent Claim
21 words
A diamond single crystal as claimed in claim 1, wherein said rough surface is formed not by etching the surface crystallographically.
Claim 16
Dependent Claim
16 words
A diamond single crystal as claimed in claim 1, wherein said crystal does not contain boron.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-21 | 1993-11-20 | 1994-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-21 | 1997-11-20 | 1998-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-21 | 2001-11-20 | 2002-05-22 | $7700.00 | Window Closed / Lapsed |