Patents by Inventor Mi-Sun Cha
Mi-Sun Cha 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: 20230321905Abstract: The disclosure relates to a 3D printer using a screw extruder, including a housing including a driving motor, a dispenser in which raw materials are stored and including a nozzle through which raw materials are sprayed, a screw extruder including a screw forming unit arranged inside the dispenser, having a rod shape, and including a spiral screw formed on an outer circumferential surface, and an extension portion extending from the screw forming unit to outside of the dispenser, and an accommodating portion provided in the housing and to which the dispenser is coupled, wherein the dispenser is detachably coupled to the accommodating portion of the housing.Type: ApplicationFiled: August 11, 2021Publication date: October 12, 2023Inventor: Mi Sun CHA
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Publication number: 20230285275Abstract: The present disclosure relates to: a biocompatible structure comprising a hollow cage, the biocompatible structure comprising, in a surface thereof, one or more open chambers that are recessed inward and hold a biologically active substance; and a method of manufacturing the same. A biocompatible structure according to one aspect comprises a mixed solution of a hydrogel and a biologically active substance in a chamber so that an osteogenesis-promoting substance is released continuously over a long period of time while having initial release stability, and thus osteogenesis at bone defect sites may be improved.Type: ApplicationFiled: December 5, 2019Publication date: September 14, 2023Inventors: Mi Sun CHA, Jae Hyup LEE
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Patent number: 11684694Abstract: Provided is a chitosan hydrogel composition including chitosan, glycerol, and a phosphate group, wherein the chitosan is crosslinked via the glycerol, the phosphate group, or a combination thereof. The temperature at which the chitosan hydrogel composition may be induced from a liquid state into a gel state may be controlled according to the content ratio of the phosphate group and the glycerol, and since printing properties and strength are affected by the gelatin concentration, the composition may be used as an ink for 3D printing.Type: GrantFiled: April 24, 2020Date of Patent: June 27, 2023Assignee: MEDIFAB CO., LTD.Inventors: Mi Sun Cha, Jung Ju Kim
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Publication number: 20220202989Abstract: Provided is a chitosan hydrogel composition including chitosan, glycerol, and a phosphate group, wherein the chitosan is crosslinked via the glycerol, the phosphate group, or a combination thereof. The temperature at which the chitosan hydrogel composition may be induced from a liquid state into a gel state may be controlled according to the content ratio of the phosphate group and the glycerol, and since printing properties and strength are affected by the gelatin concentration, the composition may be used as an ink for 3D printing.Type: ApplicationFiled: April 24, 2020Publication date: June 30, 2022Inventors: Mi Sun CHA, Jung Ju KIM
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Publication number: 20220145254Abstract: Provided is a method of preparing a hydrogel composition including a uniform content of calcium phosphate, wherein a hydrogel composition prepared by the method has a uniform content of calcium phosphate, and thus may be used to quantify phosphates contained in the hydrogel composition. Provided is an in-vitro 3D osteoporosis model including a calcium phosphate hydrogel composition, wherein osteoblasts and osteoclasts may be three-dimensionally co-cultured inside a biogel, such that the osteoporosis model may be fabricated according to an intended use or clinical stage. Further, the model contains a calcium phosphate hydrogel with a uniform content of phosphate and thus enables quantification of calcium phosphate through measurement of phosphates, and therefore, the model may be used to screen candidate compounds for an osteoporosis drug and may effectively predict therapeutic effects of the drug on osteoporosis.Type: ApplicationFiled: July 23, 2020Publication date: May 12, 2022Inventors: Mi Sun CHA, Jung Ju KIM
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Patent number: 10717697Abstract: The present invention relates to a method for preparing 1,3-cyclohexanedicarboxylic acid capable of exhibiting excellent activity, of enhancing the reaction efficiency and economic efficiency by using a catalyst having improved durability under the reaction conditions of high temperature and strong acid, of achieving excellent conversion rates by allowing most of reactants to participate in the reaction, and of obtaining products having high purity while minimizing by-products within a shorter period of time. The method for preparing 1,3-cyclohexanedicarboxylic acid may include: reducing isophthalic acid in the presence of a metal catalyst fixed to a silica support and containing a palladium (Pd) compound and a copper (Cu) compound in a weight ratio of 1:0.1 to 0.5.Type: GrantFiled: September 27, 2017Date of Patent: July 21, 2020Assignee: LOTTE CHEMICAL CORPORATIONInventors: Sung Min Kim, Mi Sun Cha, Seong Hwan Choi, Young Heon Choi, Sung Joon Park, Chan Yeong Yun, Young Jong Seo
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Patent number: 10597344Abstract: The present invention relates to a method for preparing high-purity 1,3-cyclohexanedimethanol capable of achieving a high conversion rate by allowing most of the reactant to participate in the reaction, and of increasing reaction efficiency and economic efficiency by further simplifying the reaction process, while minimizing by-products within a shorter period of time. Specifically, the method for preparing 1,3-cyclohexanedimethanol includes reducing 1,3-cyclohexanedicarboxylic acid in the presence of a metal catalyst, which is fixed to a silica support and includes a ruthenium (Ru) compound, a tin (Sn) compound and a platinum (Pt) compound in a weight ratio of 1:0.8 to 1.2:1.2 to 2.4.Type: GrantFiled: September 5, 2017Date of Patent: March 24, 2020Assignee: Lotte Chemical CorporationInventors: Mi Sun Cha, Seong Hwan Choi, Sung Min Kim, Sung Joon Park, Chan Yeong Yun, Young Heon Choi
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Publication number: 20190264251Abstract: The present disclosure relates to a method for manufacturing a three-dimensional cell culture support having a double crosslink, and a casting tray for manufacturing the three-dimensional cell culture support, wherein the method for manufacturing the three-dimensional cell culture support having the double crosslink includes: producing a cell mixed hydrogel; manufacturing a casting gel mold in a three-dimensional shape; and manufacturing a structure gelated in a three-dimensional shape, and the casting tray for manufacturing the three-dimensional cell culture support includes: a tray part including a groove accommodating a gel solution; a mold part covering the tray part; and a mold protrusion provided on the mold part and inserted into the groove when the mold part covers the tray part.Type: ApplicationFiled: July 19, 2017Publication date: August 29, 2019Inventor: Mi Sun CHA
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Publication number: 20190225568Abstract: The present invention relates to a method for preparing 1,3-cyclohexanedicarboxylic acid capable of exhibiting excellent activity, of enhancing the reaction efficiency and economic efficiency by using a catalyst having improved durability under the reaction conditions of high temperature and strong acid, of achieving excellent conversion rates by allowing most of reactants to participate in the reaction, and of obtaining products having high purity while minimizing by-products within a shorter period of time. The method for preparing 1,3-cyclohexanedicarboxylic acid may include: reducing isophthalic acid in the presence of a metal catalyst fixed to a silica support and containing a palladium (Pd) compound and a copper (Cu) compound in a weight ratio of 1:0.1 to 0.5.Type: ApplicationFiled: September 27, 2017Publication date: July 25, 2019Inventors: Sung Min KIM, Mi Sun CHA, Seong Hwan CHOI, Young Heon CHOI, Sung Joon PARK, Chan Yeong YUN, Young Jong SEO
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Publication number: 20190202761Abstract: The present invention relates to a method for preparing high-purity 1,3-cyclohexanedimethanol capable of achieving a high conversion rate by allowing most of the reactant to participate in the reaction, and of increasing reaction efficiency and economic efficiency by further simplifying the reaction process, while minimizing by-products within a shorter period of time. Specifically, the method for preparing 1,3-cyclohexanedimethanol includes reducing 1,3-cyclohexanedicarboxylic acid in the presence of a metal catalyst, which is fixed to a silica support and includes a ruthenium (Ru) compound, a tin (Sn) compound and a platinum (Pt) compound in a weight ratio of 1:0.8 to 1.2:1.2 to 2.4.Type: ApplicationFiled: September 5, 2017Publication date: July 4, 2019Inventors: Mi Sun CHA, Seong Hwan CHOI, Sung Min KIM, Sung Joon PARK, Chan Yeong YUN, Young Heon CHOI
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Patent number: 9663426Abstract: Disclosed are a composite metal catalyst composition capable of increasing efficiency and economic feasibility of a reaction through simplification of a reaction process, and providing 1,4-cyclohexanedimethanol with high purity for a shorter time while minimizing byproducts; and a method and apparatus for preparing 1,4-cyclohexanedimethanol with high purity using the same. The present invention provides a composite metal catalyst composition for converting an aromatic dicarboxylic acid into an alicyclic diol compound, the composition containing: a first metal catalyst including a palladium (Pd) compound; and a second metal catalyst including a ruthenium (Ru) compound, a tin (Sn) compound, and a platinum (Pt) compound, and a method and apparatus for preparing 1,4-cyclohexanedimethanol using the same.Type: GrantFiled: April 7, 2015Date of Patent: May 30, 2017Assignee: LOTTE CHEMICAL CORPORATIONInventors: Young Heon Choi, Hyun Woo Park, Sung Joon Park, Seong Hwan Choi, Mi Sun Cha, Seong Min Kim, Young Jong Seo
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Publication number: 20170107164Abstract: Disclosed are a composite metal catalyst composition capable of increasing efficiency and economic feasibility of a reaction through simplification of a reaction process, and providing 1,4-cyclohexanedimethanol with high purity for a shorter time while minimizing byproducts; and a method and apparatus for preparing 1,4-cyclohexanedimethanol with high purity using the same. The present invention provides a composite metal catalyst composition for converting an aromatic dicarboxylic acid into an alicyclic diol compound, the composition containing: a first metal catalyst including a palladium (Pd) compound; and a second metal catalyst including a ruthenium (Ru) compound, a tin (Sn) compound, and a platinum (Pt) compound, and a method and apparatus for preparing 1,4-cyclohexanedimethanol using the same.Type: ApplicationFiled: April 7, 2015Publication date: April 20, 2017Applicant: LOTTE CHEMICAL CORPORATIONInventors: Young Heon CHOI, Hyun Woo PARK, Sung Joon PARK, Seong Hwan CHOI, Mi Sun CHA, Seong Min KIM, Young Jong SEO
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Patent number: 7414594Abstract: The present invention is directed to a multi display device that can realize a large-sized screen by interconnecting a plurality of display elements. The multi display device comprises at least two flat display elements of which adjacent sides are closely contact each other to make a large-sized screen, housings receiving and supporting the display elements, respectively, light-compensating means for refracting display light from the display elements toward a center area of the adjacent sides thereof, thereby to minimize or remove the non-display area in the screen.Type: GrantFiled: June 13, 2006Date of Patent: August 19, 2008Assignee: Si Han KimInventors: Si Han Kim, Hyung Nyun Kim, Mi Sun Cha
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Patent number: 7132489Abstract: The present invention relates to a fluorine-containing amphoteric polymer for surface coating and preparation method thereof, in particular, to a fluorine-containing amphoteric polymer for surface coating and preparation method thereof in which a hydrocarbon compound with hydrophilic groups serves as a main chain and a macromonomer prepared by copolymerization of an unsaturated hydrocarbon compound and a perfluoro alkyl compound is incorporated into side chains, thereby imparting amphoteric property on the present polymer. Therefore, the present polymer allows self-emulsification and shows soil release, water-repellent and oil-repellent properties with no help of emulsifier, applicable to a variety of industrial fields such as coating, adhesive, fiber, precision chemistry, biological/biochemical industry, electric/electronic, automobile and metal industries.Type: GrantFiled: April 30, 2004Date of Patent: November 7, 2006Assignee: Korea Research Institute of Chemical TechnologyInventors: Soo-Bok Lee, In Jun Park, Dong-Kwon Kim, Jeong-Hoon Kim, Jong-Wook Ha, Won-Wook So, Kwang-Won Lee, Kwang-Han Kim, Mi-Sun Cha
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Publication number: 20050096444Abstract: The present invention relates to a fluorine-containing amphoteric polymer for surface coating and preparation method thereof, in particular, to a fluorine-containing amphoteric polymer for surface coating and preparation method thereof in which a hydrocarbon compound with hydrophilic groups serves as a main chain and a macromonomer prepared by copolymerization of an unsaturated hydrocarbon compound and a perfluoro alkyl compound is incorporated into side chains, thereby imparting amphoteric property on the present polymer. Therefore, the present polymer allows self-emulsification and shows soil release, water-repellent and oil-repellent properties with no help of emulsifier, applicable to a variety of industrial fields such as coating, adhesive, fiber, precision chemistry, biological/biochemical industry, electric/electronic, automobile and metal industries.Type: ApplicationFiled: April 30, 2004Publication date: May 5, 2005Inventors: Soo-Bok Lee, In Park, Dong-Kwon Kim, Jeong-Hoon Kim, Jong-Wook Ha, Won-Wook So, Kwang-Won Lee, Kwang-Han Kim, Mi-Sun Cha