Patents by Inventor Dmitri S. Terekhov
Dmitri S. Terekhov has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230279544Abstract: A system for additive chemical vapor deposition (CVD) and (CVD) methods for producing free-standing 3D metal deposits with a controlled crystal size, the method comprising a) supplying a CVD mixture containing at least one CVD precursor into a deposition chamber having a rotatable mandrel with a deposition surface or a deposition table with a deposition surface; b) generating a radiation pattern in at least two programmable radiation modules, each programmable radiation module containing an array of individually addressable radiation transmitting and/or radiation emitting elements; and c) irradiating the deposition surface with a first radiation pattern from a first radiation module and a second radiation pattern from a second radiation module, wherein the first radiation module irradiates the deposition surface in a first direction and the second radiation module irradiates the deposition surface in a second direction, and depositing a material from the CVD mixture on the deposition surface.Type: ApplicationFiled: September 2, 2021Publication date: September 7, 2023Inventor: Dmitri S. Terekhov
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Patent number: 11401578Abstract: A method for extracting and separating Gold, Silver, Copper, Zinc and/or Lead from an Arsenic-containing ore, concentrate or tailings characterized in that the extraction is carried by roasting in the presence of a calcium-containing material and at least one of an alkali metal halide and alkaline metal halide. In the method, Arsenic remains immobilized in the extraction residue.Type: GrantFiled: November 10, 2017Date of Patent: August 2, 2022Assignee: TCM RESEARCH LTD.Inventors: Dmitri S. Terekhov, Colwyn S. van der Linde
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Publication number: 20200056260Abstract: A method for extracting and separating Gold, Silver, Copper, Zinc and/or Lead from an Arsenic-containing ore, concentrate or tailings characterized in that the extraction is carried by roasting in the presence of a calcium-containing material and at least one of an alkali metal halide and alkaline metal halide. In the method, Arsenic remains immobilized in the extraction residue.Type: ApplicationFiled: November 10, 2017Publication date: February 20, 2020Inventors: Dmitri S. Terekhov, Colwyn S. van der Linde
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Publication number: 20100275731Abstract: An improved method of reducing a mixed metal oxide composition comprising oxides of nickel, cobalt, copper and iron in a hydrogen atmosphere to produce a mixture of the respective metals, the improvement wherein the atmosphere further comprises water vapour at a concentration, temperature and time to effect selective reduction of the oxides of nickel cobalt and copper relative to the iron oxide to produce the metallic mixture having a reduced ratio of metallic iron relative to metallic nickel, cobalt and copper.Type: ApplicationFiled: July 12, 2010Publication date: November 4, 2010Applicant: CHEMICAL VAPOUR METAL REFINING INC.Inventors: Walter Curlook, Dmitri S. Terekhov, Sergiy Kovtun, Olujide Babatunde Olurin, Nanthakumar Victor Emmanuel
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Patent number: 7198770Abstract: A process for producing Ni(CO)4 from carbon monoxide and a source of nickel selected from the group consisting of elemental nickel, a nickel compound or mixtures thereof, provided the nickel compound is not nickel chloride per se or in admixture with a nickel carbonate ore, in an amount greater than 50% W/W nickel chloride; which process comprises (a) treating the nickel source with hydrogen at a pressure of at least atmospheric pressure and an effective temperature, in the presence of chloride anion or an in situ generator thereof precursor, to produce a resultant nickel; (b) reacting the carbon monoxide with the resultant nickel to produce the Ni(CO)4; and collecting the Ni(CO)4. The process offers the production of Ni(CO)4 at atmospheric pressure and at a sufficiently high rate for direct use in subsequent deposition processes without the need for storage facilities.Type: GrantFiled: March 27, 2003Date of Patent: April 3, 2007Assignee: Chemical Vapour Metal Refining, Inc.Inventors: Kamram M. Khozan, Dmitri S. Terekhov, Victor Emmanuel Nanthakumar, Sergiy Kovtun
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Patent number: 7044995Abstract: A process for preparing a pure PGM (platinum group metal) from a material containing a plurality of PGM compounds, wherein the PGM is selected from the group consisting of Pt, Pd, Os, Ir, Ru, Rh and Re, and the process includes initially forming the PGM in activated form by reduction of PGM ions in aqueous solution at pH 6–8 by a reducing agent, preferably, hydrogen.Type: GrantFiled: November 7, 2003Date of Patent: May 16, 2006Assignee: PGM Refining Inc.Inventors: Kamran M. Khozan, Dmitri S. Terekhov, Victor E. Nanthakumar, Sergiy Kovtun
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Publication number: 20040109810Abstract: A process for producing Ni(CO)4 from carbon monoxide and a source of nickel selected from the group consisting of elemental nickel, a nickel compound or mixtures thereof, provided the nickel compound is not nickel chloride per se or in admixture with a nickel carbonate ore, in an amount greater than 50% W/W nickel chloride; which process comprises (a) treating the nickel source with hydrogen at a pressure of at least atmospheric pressure and an effective temperature, in the presence of chloride anion or an in situ generator thereof precursor, to produce a resultant nickel; (b) reacting the carbon monoxide with the resultant nickel to produce the Ni(CO)4; and collecting the Ni(CO)4. The process offers the production of Ni(CO)4 at atmospheric pressure and at a sufficiently high rate for direct use in subsequent deposition processes without the need for storage facilities.Type: ApplicationFiled: March 27, 2003Publication date: June 10, 2004Inventors: Kamram M. Khozan, Dmitri S. Terekhov, Victor Emmanuel Nanthakumar, Sergiy Kovtun
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Publication number: 20040093986Abstract: A process for preparing a pure PGM (platinum group metal) from a material containing a plurality of PGM compounds, wherein the PGM is selected from the group consisting of Pt, Pd, Os, Ir, Ru, Rh and Re, and the process includes initially forming the PGM in activated form by reduction of PGM ions in aqueous solution at pH 6-8 by a reducing agent, preferably, hydrogen.Type: ApplicationFiled: November 7, 2003Publication date: May 20, 2004Inventors: Kamran M. Khozan, Dmitri S. Terekhov, Victor E. Nanthakumar, Sergiy Kovtun
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Publication number: 20020162417Abstract: A process for producing purified cobalt from a mixture comprising metallic species of cobalt and metallic species of at least one of the group consisting of nickel and iron, comprising producing a metal carbonyl mixture of cobalt carbonyl and at least one of nickel carbonyl and iron carbonyl from the metallic species mixture; separating the nickel carbonyl and/or iron carbonyl from the cobalt carbonyl; treating the cobalt carbonyl with an effective amount of a complexing gaseous mixture of nitric oxide/carbon monoxide to produce cobalt nitrosyl tricarbonyl; and decomposing the purified cobalt nitrosyl carbonyl to provide purified cobalt and regenerated complexing gaseous mixture for recycle. The process provides cobalt of improved quality in an optionally, continuous and closed-loop manner. Preferred processes include either aqueous and/or gaseous process steps.Type: ApplicationFiled: June 27, 2002Publication date: November 7, 2002Inventor: Dmitri S. Terekhov
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Patent number: 6428601Abstract: A process for producing purified cobalt from a mixture comprising metallic species of cobalt and metallic species of at least one of the group consisting of nickel and iron, comprising producing a metal carbonyl mixture of cobalt carbonyl and at least one of nickel carbonyl and iron carbonyl from the metallic species mixture; separating the nickel carbonyl and/or iron carbonyl from the cobalt carbonyl; treating the cobalt carbonyl with an effective amount of a complexing gaseous mixture of nitric oxide/carbon monoxide to produce cobalt nitrosyl tricarbonyl; and decomposing the purified cobalt nitrosyl carbonyl to provide purified cobalt and regenerated complexing gaseous mixture for recycle. The process provides cobalt of improved quality in an optionally, Continuous and closed-loop manner. Preferred processes include either aqueous and/or gaseous process steps.Type: GrantFiled: January 23, 2001Date of Patent: August 6, 2002Assignee: Chemical Vapour Metal Refining Inc.Inventor: Dmitri S Terekhov
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Publication number: 20010012499Abstract: A process for producing purified cobalt from a mixture comprising metallic species of cobalt and metallic species of at least one of the group consisting of nickel and iron, comprising producing a metal carbonyl mixture of cobalt carbonyl and at least one of nickel carbonyl and iron carbonyl from the metallic species mixture; separating the nickel carbonyl and/or iron carbonyl from the cobalt carbonyl; treating the cobalt carbonyl with an effective amount of a complexing gaseous mixture of nitric oxide/carbon monoxide to produce cobalt nitrosyl tricarbonyl; and decomposing the purified cobalt nitrosyl carbonyl to provide purified cobalt and regenerated complexing gaseous mixture for recycle. The process provides cobalt of improved quality in an optionally, continuous and closed-loop manner. Preferred processes include either aqueous and/or gaseous process steps.Type: ApplicationFiled: January 23, 2001Publication date: August 9, 2001Inventor: Dmitri S. Terekhov
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Patent number: 6132518Abstract: A closed loop, carbon monoxide self-contained preferably continuous process and apparatus for the production of nickel or nickel coated objects by nickel vapor deposition (NVD), comprising placing an object to be treated with nickel carbonyl in a deposition chamber; feeding a gaseous mixture of nickel carbonyl and carbon monoxide to the chamber; producing the nickel or nickel coated object and a nickel carbonyl-depleted gaseous mixture; removing nickel carbonyl from the nickel carbonyl-depleted gaseous mixture in a primary and subsequent secondary condensation unit and, preferably, a tertiary condensation unit to produce an essentially nickel carbonyl-free gas. The secondary and tertiary condensation units operably freeze out and subsequently thaw nickel carbonyl and most preferably each comprises a pair of units linked in parallel arrangement operative in alternating, alternate freeze-thaw modes. Carbon monoxide-containing gas is recycled to a nickel carbonyl reactor.Type: GrantFiled: December 23, 1999Date of Patent: October 17, 2000Assignee: Chemical Vapour Deposition Systems, Inc.Inventors: Miroslav Milinkovic, Rodney P. Reynolds, Dmitri S. Terekhov
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Patent number: 6048578Abstract: A closed loop, carbon monoxide self-contained preferably continuous process and apparatus for the production of nickel or nickel coated objects by nickel vapor deposition (NVD), comprising placing an object to be treated with nickel carbonyl in a deposition chamber; feeding a gaseous mixture of nickel carbonyl and carbon monoxide to the chamber; producing the nickel or nickel coated object and a nickel carbonyl-depleted gaseous mixture; removing nickel carbonyl from the nickel carbonyl-depleted gaseous mixture in a primary and subsequent secondary condensation unit and, preferably, a tertiary condensation unit to produce an essentially nickel carbonyl-free gas. The secondary and tertiary condensation units operably freeze out and subsequently thaw nickel carbonyl and most preferably each comprises a pair of units linked in parallel arrangement operative in alternating, alternate freeze-thaw modes. Carbon monoxide-containing gas is recycled to a nickel carbonyl reactor.Type: GrantFiled: November 4, 1998Date of Patent: April 11, 2000Assignee: Chemical Vapour Deposition Systems, Inc.Inventors: Miroslav Milinkovic, Rodney P. Reynolds, Dmitri S. Terekhov
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Patent number: RE41099Abstract: A process for producing purified cobalt from a mixture comprising metallic species of cobalt and metallic species of at least one of the group consisting of nickel and iron, comprising producing a metal carbonyl mixture of cobalt carbonyl and at least one of nickel carbonyl and iron carbonyl from the metallic species mixture; separating the nickel carbonyl and/or iron carbonyl from the cobalt carbonyl; treating the cobalt carbonyl with an effective amount of a complexing gaseous mixture of nitric oxide/carbon monoxide to produce cobalt nitrosyl tricarbonyl; and decomposing the purified cobalt nitrosyl carbonyl to provide purified cobalt and regenerated complexing gaseous mixture for recycle. The process provides cobalt of improved quality in an optionally, Continuous and closed-loop manner. Preferred processes include either aqueous and/or gaseous process steps.Type: GrantFiled: January 22, 2009Date of Patent: February 9, 2010Assignee: Chemical Vapour Metal Refinings Inc.Inventor: Dmitri S Terekhov