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4275050 Production of ultra-hard particles  
The production of an ultra-hard particle composed substantially of carbon as the dominant element is taught. The ultra-hard particle is the product of the reaction of a metal carbide selected from...
4260397 Method for preparing diamond compacts containing single crystal diamond  
An improvement for making polycrystalline compacts containing single crystal diamonds embedded therein is disclosed. Cracking of such compacts is minimized by isolating the diamond in a relatively...
4254091 Diamond synthesis  
The synthesis of diamonds from salts of iron, manganese, calcium and magnesium is disclosed. Specifically, such synthesis, in a closed system, has involved carbonate and oxylate salts of the...
4250156 Process for preparing carbonyl sulfide  
Carbonyl sulfide is prepared with an enhanced purity by a process wherein carbon monoxide is caused to bubble through molten sulfur maintained at a temperature of from 300° to 440° C.; and, the...
4248606 Supported diamond  
Compacts are provided in which one or more single crystal diamonds, having a largest dimension of at least one millimeter, are embedded in the polycrystalline matrix which may be made of diamond;...
4228142 Process for producing diamond-like carbon  
A process is described for the production of dense metastable phases of carbon which have characteristics similar to diamond. Particulates of the metastable carbon are produced by reacting silicon...
4225300 Reliable high pressure apparatus  
An apparatus for operation in the temperature range above 1000 degrees Centigrade and at pressures above 50 kilobars, for making industrial diamonds or the like, includes arrangements for more...
4200506 Process for providing identification markings for gemstones  
A method of providing permanent identification markings to gemstones such as diamond crystals by irradiating the gemstone with protons in the desired pattern. The proton bombardment results in a...
4196181 Microcrystalline monolithic carbon material  
A material consisting of grains varying in size from 0.1 to a few microns intergrown so as to form regular aggregates. The geometric shape of the material is preset by a pattern made from a...
4191735 Growth of synthetic diamonds  
A method of growing a diamond crystal which comprises bombarding the diamond with a flux of carbon ions of sufficient energy to penetrate the diamond crystal and cause crystal growth which is at...
4181505 Method for the work-hardening of diamonds and product thereof  
Extensive development of deformation bands in diamond crystals results from subjecting diamond material properly confined to reduce or eliminate brittle fracture thereof to the simultaneous...
4174380 Annealing synthetic diamond type Ib  
Type Ib synthetic diamond crystal is annealed at an annealing temperature ranging from about 1500° C. to about 2200° C. under a pressure which prevents significant graphitization of the diamond...
4147255 Process for synthesizing diamonds  
A process for synthesizing diamonds and more particularly a system for indirectly heating raw material charged in a reaction chamber for the diamond synthesis. The system comprises a hollow...
4124690 Annealing type Ib or mixed type Ib-Ia natural diamond crystal  
Type Ib or mixed type Ib-Ia natural diamond crystal is annealed at an annealing temperature ranging from about 1500° C to about 2200° C under a pressure which prevents significant graphitization...
4122636 Synthetic RD diamond particles  
The invention provides elongate synthetic RD diamond particles, each particle having a long axis and a short transverse axis, the ratio of the long axis to the short axis being at least 3 to 1....
4123504 Method of making diamonds synthetically  
A method of diamond synthesis, by which a reaction mixture is prepared comprising, taken in direct contact, a carbon-containing material and a combination of components selected from the group...
4119708 High temperature, high pressure process utilizing a ductile driver element  
A high pressure, high temperature, piston-cylinder type apparatus utilizing a soft, ductile, electrically conductive material as a driver element to transmit pressure from the piston to a charge...
4119500 Process for eliminating magnetism of synthetic diamond grains  
A process for thermally treating synthetic diamond grains to eliminate magnetism thereof and a diamond grain product obtained by the process, which is suitable for manufacturing electrodeposited...
4118161 High temperature, high pressure apparatus having a ductile driver element  
A high pressure, high temperature, piston-cylinder type apparatus which utilizes a soft, ductile, electrically conductive material as a driver element to transmit pressure from the piston to a...
4113846 Method of pressure treatments of materials  
A method of increasing to a predetermined value the pressure exerted on materials treated in high pressure chambers. A first pressure-exerting force is used to act on the material throughout the...
4104441 Polycrystalline diamond member and method of preparing same  
A method of preparing a polycrystalline diamond member comprising sintering diamond particles having deposited thereon, not only diamond coating, but also diamond-graphite coatingIn the epitaxial...
4089933 Method of producing polycrystalline diamond aggregates  
A method of producing polycrystalline diamond aggregates, wherein a carbon-containing material is given a required shape, after which, in the presence of a catalyst taken in the form of a powder...
4085196 Process for producing synthetic diamonds  
A process for producing synthetic diamonds which comprises the synthesis of diamonds from a charge consisting of graphite or a carbonaceous material capable of being graphitized and a catalyst; as...
4082185 Manufacture of diamond products  
Diamond crystals of controlled impurity content and/or impurity distribution and reaction vessel configurations for the production thereof are described. Combinations of "dopant", "getter" and...
4074471 Process for nucleating diamonds  
The specification discloses nucleating diamonds in the absence of an external container. Nickel and graphite are subjected to high temperature and pressure, e.g., by a grinding process, sufficient...
4073380 High pressure reaction vessel for quality control of diamond growth on diamond seed  
Improvements are provided in reaction vessel construction used in the growth of diamond by the process disclosed in U.S. Pat. No. 3,297,407 -- Wentorf, Jr. In assembly of the reaction vessel of...
4049783 Method of producing polycrystalline diamonds  
A method of producing polycrystalline diamonds which is characterized by providing a thermal contact of the reaction chamber with the cooled members of the device developing a high pressure and...
4042673 Novel diamond products and the manufacture thereof  
Diamond crystals of controlled impurity content and/or impurity distribution and reaction vessel configurations for the production thereof are described. Combinations of "dopant," "getter" and...
4036937 Diamond synthesis  
The invention provides elongate synthetic RD diamond particles, each particle having a long axis and a short transverse axis, the ratio of the long axis to the short axis being at least 3 to 1....
4035472 Process for producing diamond  
Industrial diamond powder is prepared from a mixture of graphite and a non-metallic material which is semi-transparent to thermal radiation by projecting a solid body against said mixture at a...
4034066 Method and high pressure reaction vessel for quality control of diamond growth on diamond seed  
Improvements are provided in reaction vessel construction used in the growth of diamond by the process disclosed in U.S. Pat. No. 3,297,407 -- Wentorf, Jr. In assembly of the reaction vessel of...
4005180 Method for producing synthetic diamonds  
This invention relates to the synthesis of diamond by subjecting a carbon-containing composition substantially free of carbon-hydrogen covalent bonds to conditions of temperature and pressure such...
3969489 Process for recovering synthetic diamonds from pressed runs  
A diamond synthesis run containing synthetic diamonds, graphite and catalyst from a high pressure temperature diamond process is treated with bromine to remove substantially all of the graphite....
3961103 Film deposition  
A method and apparatus for depositing a thin film of material upon a base substrate including a glow discharge ion source for generating the particular ions that will be subsequently deposited...
3890430 Method of producing diamond materials  
To synthesize diamond a carbonaceous material in the presence of metals, such as zinc, magnesium, lead, cadmium, bismuth, tin, indium, antimony, thallium, aluminium, mercury and compounds thereof...
3816085 DIAMOND-NONDIAMOND CARBON POLYCRYSTALLINE COMPOSITES  
Diamond-nondiamond carbon polycrystalline composites particularly useful as abrasives are made by sintering diamond particles at temperatures above about 1440°K but at pressures below which...
3714332 PROCESS FOR MAKING DIAMONDS  
Apparatus and process for the production of diamond is disclosed. The apparatus includes an exponential horn tapering from a large end to a small end. A copper plate is mounted against the large...
3714334 PROCESS FOR EPITAXIAL GROWTH OF DIAMONDS  
A method for growing diamonds in the form of diamond dust, industrial grade diamonds and the like, by epitaxy comprising the steps of providing a diamond seed crystal, contacting said diamond seed...
3711595 CHEMICAL METHOD FOR PRODUCING DIAMONDS AND FLUORINATED DIAMONDS  
Diamonds, as well as fluorinated diamonds, can be produced by reacting a fluorinated carbon material, such as polytetrafluoroethylene, carbon monofluoride or polytrichlorofluoroethylene, with...
3702573 CERMET PRODUCT AND METHOD AND APPARATUS FOR THE MANUFACTURE THEREOF  
The invention relates to a cermet product and a method and apparatus for the manufacture thereof in which carbonaceous material is placed in a cell in the presence of metal and converted to...
3661526 PROCESS FOR THE CATALYTIC GROWTH OF METASTABLE CRYSTALS FROM THE VAPOR PHASE  
There is provided a process for growing metastable crystals, e.g., diamonds, from seed crystals at sub-atmospheric pressures and temperatures in the range of from 800°-1,700° C. The process is...
3655340 METHOD OF MANUFACTURING DIAMOND CRYSTALS  
Diamond crystals are produced by subjecting to elevated temperatures and pressures a mixture of a nondiamond form of carbon together with a mixture or alloy of nickel and phosphorus, which serves...
3652220 METHOD OF MANUFACTURING SYNTHETIC DIAMONDS  
Synthetic diamonds are produced by subjecting carbonaceous material to heat and pressure in the presence of a metallic solvent having projecting portions.
3644094 PROCESS FOR THE RECOVERY OF DIAMOND PARTICLES FROM ALUMINA OR SILICATE WASTES  
Alumina wastes, and various silicate wastes, produced by grinding ceramic workpieces with diamond impregnated wheels are intermixed with a borax flux and heated in a nonoxidizing atmosphere to...
3630679 DIAMOND GROWTH PROCESS  
There is provided an improved process for the growth of diamonds from seed crystal with a gaseous monocarbon atom compound which is characterized by extremely low pressures not in excess of 1×10-2...
3630677 MANUFACTURE OF SYNTHETIC DIAMONDS  
There is provided an improvement on a low-pressure process for the growth of synthetic diamonds from diamond seed crystals by contacting them with a monocarbon atom gas which also contains a...
3536447 METHOD OF PREPARING SYNTHETIC DIAMOND CRYSTALS  
3499732 METHOD FOR MAKING DIAMOND  
3488153 NON-CATALYTICALLY PRODUCED CUBIC AND HEXAGONAL DIAMOND  
3676069 METHOD FOR MANUFACTURING DIAMONDS IN A HYDROGEN FREE ENVIRONMENT