Patents by Inventor Cheng-Jung Ko
Cheng-Jung Ko 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: 20230227998Abstract: Provides a method for adjusting a thermal field of silicon carbide single crystal growth, and steps comprise: (A) screening a silicon carbide source, and filling into a bottom of a graphite crucible; (B) placing a guide inside the graphite crucible; (C) placing a rigid heat conductive material on the guide, so that a gap between the guide and a crucible wall of the graphite crucible is reduced; (D) fixing a seed crystal on a top of the graphite crucible; (E) placing the graphite crucible equipped with the silicon carbide source and the seed crystal in an induction high-temperature furnace used by physical vapor transport method; (F) performing a silicon carbide crystal growth process; and (G) obtaining a silicon carbide single crystal.Type: ApplicationFiled: January 20, 2022Publication date: July 20, 2023Inventors: HSUEH-I CHEN, CHENG-JUNG KO, CHIH-WEI KUO, JUN-BIN HUANG, CHIA-HUNG TAI
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Publication number: 20230167579Abstract: Provided is a method of enhancing silicon carbide monocrystalline growth yield, including the steps of: (A) filling a bottom of a graphite crucible with a silicon carbide raw material selected; (B) performing configuration modification on a graphite seed crystal platform; (C) fastening a silicon carbide seed crystal to the modified graphite seed crystal platform with a graphite clamping accessory; (D) placing the graphite crucible containing the silicon carbide raw material and the silicon carbide seed crystal in an inductive high-temperature furnace; (E) performing silicon carbide crystal growth process by physical vapor transport; and (F) obtaining silicon carbide monocrystalline crystals. The geometric configuration of the surface of the graphite seed crystal platform is modified to eradicate development of peripheral grain boundary.Type: ApplicationFiled: November 30, 2021Publication date: June 1, 2023Inventors: CHIH-WEI KUO, CHENG-JUNG KO, HSUEH-I CHEN, JUN-BIN HUANG, CHIA-HUNG TAI
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Publication number: 20220251725Abstract: A method of growing on-axis silicon carbide single crystal includes the steps of (A) sieving a silicon carbide source material by size, and only the part that has a size larger than 1 cm is adopted for use as a sieved silicon carbide source material; (B) filling the sieved silicon carbide source material in the bottom of a graphite crucible; (C) positioning an on-axis silicon carbide on a top of the graphite crucible to serve as a seed crystal; (D) placing the graphite crucible having the sieved silicon carbide source material and the seed crystal received therein in an induction furnace for the physical vapor transport process; (E) starting a silicon carbide crystal growth process; and (F) obtaining a silicon carbide single crystal.Type: ApplicationFiled: February 9, 2021Publication date: August 11, 2022Inventors: CHIH-WEI KUO, CHENG-JUNG KO, HSUEH-I CHEN, JUN-BIN HUANG, YING-TSUNG CHAO, CHIA-HUNG TAI
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Patent number: 11130152Abstract: A method for the formation of tantalum carbides on a graphite substrate includes the steps of: (a) adding an organic tantalum compound, a chelating agent, a pre-polymer to an organic solvent to form a tantalum polymeric solution; (b) subjecting a graphite substrate with the tantalum polymeric solution to a curing process to form a polymeric tantalum film on the graphite substrate; and (c) subjecting the polymeric tantalum film on the graphite substrate in an oven to a pyrolytic reaction in the presence of a protective gas to obtain a protective tantalum carbide on the graphite substrate.Type: GrantFiled: November 28, 2019Date of Patent: September 28, 2021Assignee: National Chung-Shan Institute of Science and TechnologyInventors: Cheng-Jung Ko, Jun-Bin Huang, Chih-Wei Kuo, Dai-Liang Ma, Bang-Ying Yu
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Patent number: 11072871Abstract: A preparation apparatus for uniform silicon carbide crystals comprises a circular cylinder, a doping tablet, and a plate to stabilize and control the supply of dopants. The accessory does not participate in the reaction in the growth chamber but maintains its efficacy during growth. Finally, a single semi-insulating silicon carbide crystal with uniform electrical characteristics can be obtained.Type: GrantFiled: December 20, 2019Date of Patent: July 27, 2021Assignee: National Chung-Shan Institute of Science and TechnologyInventors: Chih-Wei Kuo, Dai-Liang Ma, Chia-Hung Tai, Bang-Ying Yu, Cheng-Jung Ko, Bo-Cheng Lin, Hsueh-I Chen
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Patent number: 11049717Abstract: A method for fabricating an ultra-thin graphite film on a silicon carbide substrate includes the steps of: (A) providing a polyamic acid solution and a siloxane-containing coupling agent for polymerizing under an inert gas atmosphere to form a siloxane-coupling-group-containing polyamic acid solution; (B) performing a curing process after applying the siloxane-coupling-group-containing polyamic acid solution to a silicon carbide substrate; (C) placing the silicon carbide substrate in a graphite crucible before placing the graphite crucible in a reaction furnace to perform a carbonization process under an inert gas atmosphere; (D) subjecting the silicon carbide substrate to a graphitization process to obtain a graphite film, thereby make it possible to fabricate an ultra-thin graphite film of high-quality on the surface of silicon carbide in a lower graphitization temperature range.Type: GrantFiled: December 21, 2018Date of Patent: June 29, 2021Assignee: National Chung-Shan Institute of Science and TechnologyInventors: Dai-Liang Ma, Cheng-Jung Ko, Chia-Hung Tai, Jun-Bin Huang, Bang-Ying Yu
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Publication number: 20210189590Abstract: A preparation apparatus for uniform silicon carbide crystals comprises a circular cylinder, a doping tablet, and a plate to stabilize and control the supply of dopants. The accessory does not participate in the reaction in the growth chamber but maintains its efficacy during growth. Finally, a single semi-insulating silicon carbide crystal with uniform electrical characteristics can be obtained.Type: ApplicationFiled: December 20, 2019Publication date: June 24, 2021Inventors: Chih-Wei Kuo, Dai-Liang Ma, Chia-Hung Tai, Bang-Ying Yu, Cheng-Jung Ko, Bo-Cheng Lin, Hsueh-I Chen
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Publication number: 20210162453Abstract: A method for the formation of tantalum carbides on a graphite substrate includes the steps of: (a) adding an organic tantalum compound, a chelating agent, a pre-polymer to an organic solvent to form a tantalum polymeric solution; (b) subjecting a graphite substrate with the tantalum polymeric solution to a curing process to form a polymeric tantalum film on the graphite substrate; and (c) subjecting the polymeric tantalum film on the graphite substrate in an oven to a pyrolytic reaction in the presence of a protective gas to obtain a protective tantalum carbide on the graphite substrate.Type: ApplicationFiled: November 28, 2019Publication date: June 3, 2021Inventors: Cheng-Jung Ko, Jun-Bin Huang, Chih-Wei Kuo, Dai-Liang Ma, Bang-Ying Yu
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Publication number: 20200203162Abstract: A method for fabricating an ultra-thin graphite film on a silicon carbide substrate includes the steps of: (A) providing a polyamic acid solution and a siloxane-containing coupling agent for polymerizing under an inert gas atmosphere to form a siloxane-coupling-group-containing polyamic acid solution; (B) performing a curing process after applying the siloxane-coupling-group-containing polyamic acid solution to a silicon carbide substrate; (C) placing the silicon carbide substrate in a graphite crucible before placing the graphite crucible in a reaction furnace to perform a carbonization process under an inert gas atmosphere; (D) subjecting the silicon carbide substrate to a graphitization process to obtain a graphite film, thereby make it possible to fabricate an ultra-thin graphite film of high-quality on the surface of silicon carbide in a lower graphitization temperature range.Type: ApplicationFiled: December 21, 2018Publication date: June 25, 2020Inventors: Dai-Liang Ma, Cheng-Jung Ko, Chia-Hung Tai, Jun-Bin Huang, Bang-Ying Yu
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Patent number: 10612159Abstract: A device for measuring distribution of thermal field in a crucible comprises a crucible comprising an upper lid, a body, a growth chamber and a material source zone; a thermally insulating material disposed outside the crucible; a movable heating component for heating the crucible; a plurality of thermocouples enclosed by insulating, high temperature resistant material and disposed in the crucible after being inserted into a plurality of holes on the upper lid to measure distribution of thermal field in the crucible. The thermocouples enclosed by insulating, high temperature resistant material are effective in measuring and adjusting temperature distribution in the crucible to achieve optimal temperature distribution for crystal growth in the crucible.Type: GrantFiled: March 7, 2018Date of Patent: April 7, 2020Assignee: NATIONAL CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Dai-Liang Ma, Tsao-Chun Peng, Cheng-Jung Ko, Bang-Ying Yu, Chih-Wei Kuo, Ying-Cong Zhao
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Patent number: 10385443Abstract: A device for growing large-sized monocrystalline crystals, including a crucible adapted to grow crystals from a material source and with a seed crystal and including therein a seed crystal region, a growth chamber, and a material source region; a thermally insulating material disposed outside the crucible and below a heat dissipation component; and a plurality of heating components disposed outside the thermally insulating material to provide heat sources, wherein the heat dissipation component is of a heat dissipation inner diameter and a heat dissipation height which exceeds a thickness of the thermally insulating material.Type: GrantFiled: November 16, 2016Date of Patent: August 20, 2019Assignee: NATIONAL CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Dai-Liang Ma, Hsueh-I Chen, Bo-Cheng Lin, Cheng-Jung Ko, Ying-Cong Zhao, Chih-Wei Kuo, Shu-Yu Yeh
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Publication number: 20190186045Abstract: A device for growing a carbide of specific shape includes (A) a crucible; (B) a raw material source zone where a SiC raw material precursor is accessible; (C) a deposition zone where SiC is grown; (D) a gas temperature gradient control zone characterized by a temperature gradient; (E) a current deposition carrier disposed within the deposition zone and characterized by at least one repetition of a succession of one or at least two specific shapes of the current deposition carrier; and (F) a heating component for heating the SiC raw material precursor to turn it into gas molecules, so as to effectuate its deposition on the current deposition carrier.Type: ApplicationFiled: February 26, 2018Publication date: June 20, 2019Inventors: BANG-YING YU, HSUEH-I CHEN, DAI-LIANG MA, CHENG-JUNG KO
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Publication number: 20190186043Abstract: A device for measuring distribution of thermal field in a crucible comprises a crucible comprising an upper lid, a body, a growth chamber and a material source zone; a thermally insulating material disposed outside the crucible; a movable heating component for heating the crucible; a plurality of thermocouples enclosed by insulating, high temperature resistant material and disposed in the crucible after being inserted into a plurality of holes on the upper lid to measure distribution of thermal field in the crucible. The thermocouples enclosed by insulating, high temperature resistant material are effective in measuring and adjusting temperature distribution in the crucible to achieve optimal temperature distribution for crystal growth in the crucible.Type: ApplicationFiled: March 7, 2018Publication date: June 20, 2019Inventors: DAI-LIANG MA, TSAO-CHUN PENG, CHENG-JUNG KO, BANG-YING YU, CHIH-WEI KUO, YING-CONG ZHAO
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Patent number: 10246334Abstract: A method of producing a heterophase graphite, including the steps of (A) providing a silicon carbide single-crystal substrate; (B) placing the silicon carbide single-crystal substrate in a graphite crucible and then in a reactor to undergo an air extraction process; and (C) performing a desilicification reaction on the silicon carbide single-crystal substrate in an inert gas atmosphere to obtain 2H graphite and 3R graphite, so as to directly produce lumpy (sheetlike, crushed, particulate, and powderlike) 2H graphite and 3R graphite, and preclude secondary contamination of raw materials which might otherwise occur because of a crushing step, an oxidation step, and an acid rinsing step.Type: GrantFiled: February 16, 2017Date of Patent: April 2, 2019Assignee: NATIONAL CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Dai-Liang Ma, Cheng-Jung Ko, Bang-Ying Yu, Tsao-Chun Peng
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Publication number: 20180179065Abstract: A method of producing a heterophase graphite, including the steps of (A) providing a silicon carbide single-crystal substrate;(B) placing the silicon carbide single-crystal substrate in a graphite crucible and then in a reactor to undergo an air extraction process; and (C) performing a desilicification reaction on the silicon carbide single-crystal substrate in an inert gas atmosphere to obtain 2H graphite and 3R graphite, so as to directly produce lumpy (sheetlike, crushed, particulate, and powderlike) 2H graphite and 3R graphite, and preclude secondary contamination of raw materials which might otherwise occur because of a crushing step, an oxidation step, and an acid rinsing step.Type: ApplicationFiled: February 16, 2017Publication date: June 28, 2018Inventors: DAI-LIANG MA, CHENG-JUNG KO, BANG-YING YU, TSAO-CHUN PENG
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Publication number: 20180087186Abstract: A method of producing a carbide raw material includes the steps of (A) providing a porous carbon material and a high-purity silicon raw material or a metal raw material and applying the porous carbon material and the high-purity silicon raw material or a metal raw material alternately to form a layer structure; (B) putting the layer structure in a synthesis furnace to undergo a gas evacuation process; and (C) producing a carbide raw material with a synthesis reaction which the layer structure undergoes in an inert gas atmosphere, wherein the carbide raw material is a carbide powder of a particle diameter of less than 300 ?m, thereby preventing secondary raw material contamination otherwise arising from comminution, oxidation and acid rinsing.Type: ApplicationFiled: November 15, 2016Publication date: March 29, 2018Inventors: CHENG-JUNG KO, DAI-LIANG MA, BO-CHENG LIN, HSUEH-I CHEN, BANG-YING YU, SHU-YU YEH
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Publication number: 20180057925Abstract: A device for growing large-sized monocrystalline crystals, including a crucible adapted to grow crystals from a material source and with a seed crystal and including therein a seed crystal region, a growth chamber, and a material source region; a thermally insulating material disposed outside the crucible and below a heat dissipation component; and a plurality of heating components disposed outside the thermally insulating material to provide heat sources, wherein the heat dissipation component is of a heat dissipation inner diameter and a heat dissipation height which exceeds a thickness of the thermally insulating material.Type: ApplicationFiled: November 16, 2016Publication date: March 1, 2018Inventors: DAI-LIANG MA, HSUEH-I CHEN, BO-CHENG LIN, CHENG-JUNG KO, YING-CONG ZHAO, CHIH-WEI KUO, SHU-YU YEH
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Publication number: 20150166346Abstract: In a method of fabricating graphite films, mesophase pitch, a polymer material and an organic solvent are used to produce a carbon precursor slurry, and the carbon precursor slurry is coated to produce the graphite films. Since the method of using natural graphite as a raw material in production requires a number of purification processes to manufacture an expanded graphite powder before the graphite films can be produced, and thus the fabricating cost is very high, and other high-priced materials such as polyimide (PI) or graphene also will increase the total cost.Type: ApplicationFiled: December 18, 2013Publication date: June 18, 2015Applicant: Chung-Shan Institute of Science and Technology, Armaments Bureau, M.N.DInventors: Hsin-Ping Chang, Cheng-Jung Ko, Chin-Wei Kuo, Chuen-Ming Gee, Pai-Lu Wang, Ching-Jang Lin, Dam-Ming Chiou