Patents by Inventor Chang Choi

Chang Choi 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).

  • Patent number: 12378575
    Abstract: The present disclosure is related generally to systems and methods for high level expression of recombinant proteins from baculovirus in insect cells. In particular, the methods and systems described herein allow for high levels of baculovirus production in insect cells and/or high levels of protein production in insect cells using a chemically-defined, yeast lysate-free insect cell medium. The disclosure also relates to compositions and kits for culturing, transfecting, and/or producing recombinant protein in insect cells.
    Type: Grant
    Filed: April 11, 2019
    Date of Patent: August 5, 2025
    Assignee: Life Technologies Corporation
    Inventors: Maya Yovcheva, Jonathan Zmuda, Sara Barnes, Chang Choi, Kenneth Thompson
  • Publication number: 20250206279
    Abstract: A braking apparatus includes a pedal configured to be pressed by a driver to cause braking, a master cylinder part in which pressure of oil is amplified by the pressure applied to the pedal part, a block part configured to be supplied with the oil from the master cylinder. An electric pump part is inserted into block part and is configured to amplify the pressure of the oil in the block part. A wheel cylinder part is connected to the block part that is configured to receive pressurized oil from the block part and to generate a braking force for a wheel. The block part defines a space into which the electric pump part is inserted and a plurality of oil movement paths that are connected to the space and separate from each other when the electric pump part is inserted into the space.
    Type: Application
    Filed: July 10, 2024
    Publication date: June 26, 2025
    Applicant: HYUNDAI MOBIS CO., LTD.
    Inventors: Sung Ki AHN, Young Chang CHOI, Jeong Hoon BAE
  • Publication number: 20250194940
    Abstract: Provided are a device and method for estimating blood pressure in a non-contact manner. The device includes a memory, an imaging module that captures a body part image of a user, and a processor connected to the memory and the imaging module. The processor extracts a remote photoplethysmography (rPPG) signal from the body part image, detects a plurality of peak values from the rPPG signal, extracts heart rate variability (HRV) parameters using the detected peak values, and estimates blood pressure of the user on the basis of the HRV parameters.
    Type: Application
    Filed: December 19, 2024
    Publication date: June 19, 2025
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Tae Wuk BAE, Kee Koo KWON, Eun Chang CHOI
  • Patent number: 12319255
    Abstract: According to at least one aspect, the present disclosure provides a piston pump comprising: a piston unit configured to reciprocate by driving of a motor cam; a sleeve unit disposed to surround at least a part of the piston unit and having a space in which brake oil is stored; and a check valve unit facing the sleeve unit and discharging the brake oil to an outside of the sleeve unit when a pressure of the brake oil increases, wherein the piston unit includes a first piston having a first end in contact with the motor cam and reciprocating, a second piston having a first end coupled to a second end of the first piston and configured to press the brake oil, and a spring cap coupled to a second end of the second piston and disposed to accommodate an inlet spring therein.
    Type: Grant
    Filed: November 19, 2021
    Date of Patent: June 3, 2025
    Assignee: HYUNDAI MOBIS CO., LTD.
    Inventor: Young Chang Choi
  • Patent number: 12269737
    Abstract: The present invention relates to a method of manufacturing gallium nitride quantum dots, and more particularly, to a method of manufacturing gallium nitride quantum dots doped with metal ions, which uses a wet-based synthesis method capable of lowering the fluorescence energy of pure gallium nitride by introducing metal ions into pure gallium nitride.
    Type: Grant
    Filed: May 8, 2019
    Date of Patent: April 8, 2025
    Assignee: Korea University Research and Business Foundation
    Inventors: Kwang Seob Jeong, Yun Chang Choi
  • Publication number: 20240372257
    Abstract: A multiband diplexer for an antenna to separate a multiband wireless signal includes a first signal passing unit connected to a side of a single feed horn of the antenna and configured to pass a first band signal and a second signal passing unit positioned coaxially with the first signal passing unit and configured to pass a second band signal, and the multiband diplexer is configured to separate the first band signal and the second band signal from a signal received by the single feed horn, in which at least one of the first signal passing unit and the second signal passing unit is configured to suppress a higher order mode.
    Type: Application
    Filed: June 8, 2022
    Publication date: November 7, 2024
    Inventors: Woo Chang CHOI, Seung Woong CHOI
  • Publication number: 20230183163
    Abstract: In methods for preparing an alkyl carboxylic acid ester according to an embodiment, a first reaction product is produced by reaction of a carboxylic acid stream and a first alcohol stream in a preliminary reactor. A second reaction product is produced by at least partially removing alcohol and water from the first reaction product. The second reaction product is esterified by reaction with a second alcohol stream in a main reactor. An alkyl carboxylic acid ester is recovered from the main reactor.
    Type: Application
    Filed: February 14, 2023
    Publication date: June 15, 2023
    Inventors: Kyoung Jun LEE, In Chang CHOI, Woo Young KIM
  • Patent number: 11608307
    Abstract: In methods for preparing an alkyl carboxylic acid ester according to embodiments of the present invention, a first reaction product is produced by reaction of a carboxylic acid stream and a first alcohol stream in a preliminary reactor. A second reaction product is produced by at least partially removing alcohol and water from the first reaction product. The second reaction product is esterified by reaction with a second alcohol stream in a main reactor. An alkyl carboxylic acid ester is recovered from the main reactor.
    Type: Grant
    Filed: November 25, 2019
    Date of Patent: March 21, 2023
    Assignee: GS CALTEX CORPORATION
    Inventors: Kyoung Jun Lee, In Chang Choi, Woo Young Kim
  • Publication number: 20220185257
    Abstract: According to at least one aspect, the present disclosure provides a piston pump comprising: a piston unit configured to reciprocate by driving of a motor cam; a sleeve unit disposed to surround at least a part of the piston unit and having a space in which brake oil is stored; and a check valve unit facing the sleeve unit and discharging the brake oil to an outside of the sleeve unit when a pressure of the brake oil increases, wherein the piston unit includes a first piston having a first end in contact with the motor cam and reciprocating, a second piston having a first end coupled to a second end of the first piston and configured to press the brake oil, and a spring cap coupled to a second end of the second piston and disposed to accommodate an inlet spring therein.
    Type: Application
    Filed: November 19, 2021
    Publication date: June 16, 2022
    Applicant: HYUNDAI MOBIS Co., Ltd.
    Inventor: Young Chang CHOI
  • Publication number: 20220009872
    Abstract: In methods for preparing an alkyl carboxylic acid ester according to embodiments of the present invention, a first reaction product is produced by reaction of a carboxylic acid stream and a first alcohol stream in a preliminary reactor. A second reaction product is produced by at least partially removing alcohol and water from the first reaction product. The second reaction product is esterified by reaction with a second alcohol stream in a main reactor. An alkyl carboxylic acid ester is recovered from the main reactor.
    Type: Application
    Filed: November 25, 2019
    Publication date: January 13, 2022
    Inventors: Kyoung Jun LEE, In Chang CHOI, Woo Young KIM
  • Publication number: 20210340010
    Abstract: The present invention relates to a method of manufacturing gallium nitride quantum dots, and more particularly, to a method of manufacturing gallium nitride quantum dots doped with metal ions, which uses a wet-based synthesis method capable of lowering the fluorescence energy of pure gallium nitride by introducing metal ions into pure gallium nitride.
    Type: Application
    Filed: May 8, 2019
    Publication date: November 4, 2021
    Applicant: Korea University Research and Business Foundation
    Inventors: Kwang Seob JEONG, Yu Chang CHOI
  • Publication number: 20210310024
    Abstract: The present disclosure is related generally to systems and methods for high level expression of recombinant proteins from baculovirus in insect cells. In particular, the methods and systems described herein allow for high levels of baculovirus production in insect cells and/or high levels of protein production in insect cells using a chemically-defined, yeast lysate-free insect cell medium. The disclosure also relates to compositions and kits for culturing, transfecting, and/or producing recombinant protein in insect cells.
    Type: Application
    Filed: April 11, 2019
    Publication date: October 7, 2021
    Inventors: Maya YOVCHEVA, Jonathan ZMUDA, Sara BARNES, Chang CHOI, Kenneth THOMPSON
  • Patent number: 11111914
    Abstract: A piston pump for a brake may include: a piston moved by rotation of a motor cam, and movably installed in a piston housing; a sleeve installed in a shape to cover an end of the piston, and having an inner space for storing brake oil moved from the piston; an airtight mounting part coupled to the end of the piston, and blocking brake oil from moving between the piston and the sleeve; a return spring having both sides contacted with the sleeve and the airtight mounting part, and elastically pressing the airtight mounting part toward the motor cam; an inlet ball pressed toward the piston by an inlet spring, and installed in contact with the airtight mounting part; and a check valve installed at a position facing the sleeve, and discharging brake oil to the outside of the sleeve when the pressure of the brake oil rises.
    Type: Grant
    Filed: October 10, 2019
    Date of Patent: September 7, 2021
    Assignee: HYUNDAI MOBIS CO., LTD.
    Inventor: Young Chang Choi
  • Patent number: 11065034
    Abstract: An automatic hair implanter is capable of continuously performing hair transplantation work by applying a structure of a conventional manual hair implanter. The automatic hair implanter (hair transplantation device) comprises a rotating magazine therein, and several needle modules are stored in the magazine. Two pushrods, which are positioned on a rear portion of the device and capable of translational motion, play a role of pushing a needle and a shaft, which constitute a needle module, forward. The needle and the shaft may be moved backward by a spring positioned inside the magazine.
    Type: Grant
    Filed: February 27, 2019
    Date of Patent: July 20, 2021
    Assignees: Electronics and Telecommunications Research Institute, Kyungpook National University Industry-Academic Cooperation Foundation
    Inventors: Jung Wook Suh, Kyu Hyung Kim, Moon Kyu Kim, Jung Chul Kim, Tae Wuk Bae, Soo In Lee, Eun Chang Choi
  • Patent number: 10881431
    Abstract: The present disclosure relates to a hair implanter with an automatically retracting needle, and more specifically, to a hair implanter with an automatically retracting needle configured to automatically move a needle backward by a force of a spring when the needle is moved forward to a predetermined position to allow hair transplantation work to be smoothly performed.
    Type: Grant
    Filed: August 20, 2018
    Date of Patent: January 5, 2021
    Assignees: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Kyungpook National University Industry-Academic Cooperation Foundation
    Inventors: Jung Wook Suh, Kyu Hyung Kim, Moon Kyu Kim, Jung Chui Kim, Tae Wuk Bae, Eun Chang Choi
  • Patent number: 10835390
    Abstract: The present invention relates to a method for manufacturing a bone graft material using 3D printing of a DLP system. The method includes (1) dispersing a powder material including calcium phosphate-based ceramics in a solvent; (2) recovering the calcium phosphate-based ceramics by removing the solvent from a solution in which the calcium phosphate-based ceramic material is dispersed in Step 1; (3) producing a photocurable resin composition by adding a binder resin including a crosslinking agent and a photoinitiator to the calcium phosphate-based ceramics obtained in Step 2; (4) performing 3D rapid prototyping on a bone graft material molded body from the composition for a bone graft material produced in Step 3 by 3D printing of a DLP system; and (5) debinding and sintering organic materials remaining in the bone graft material molded body subjected to prototyping in Step 4.
    Type: Grant
    Filed: December 11, 2018
    Date of Patent: November 17, 2020
    Assignees: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Korea Textile Machinery Convergence Research Institute
    Inventors: So Young Yang, Yong Il Chung, Kyu Hyung Kim, Min Ji Lee, Soo In Lee, Eun Chang Choi
  • Patent number: 10695090
    Abstract: Disclosed is an automatic hair transplant apparatus including a needle module in which a hair follicle is inserted, a supplying case which has a magazine shape into which the needle module is inserted like a bullet of a gun, a withdrawing case which has a magazine shape into which the needle module is inserted like a bullet of a gun, and a hair transplanter on which the supplying case and the withdrawing case are mounted and which transplants hair follicles into a scalp by sequentially operating needle modules in the supplying case one by one and inserts needle modules from which hair follicles are removed into the withdrawing case.
    Type: Grant
    Filed: January 10, 2018
    Date of Patent: June 30, 2020
    Assignees: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, KYUNGPOOK NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION
    Inventors: Tae Wuk Bae, Yong Chul Jung, Moon Kyu Kim, Jung Chul Kim, Kyu Hyung Kim, Jung Wook Suh, Soo In Lee, Hyung Soo Lee, Eun Chang Choi
  • Publication number: 20200155300
    Abstract: An automatic hair implant apparatus according to the present disclosure includes a cylinder including a nozzle at an exit side and having a supporting part partially opened on a path, an implant unit configured to pass through the nozzle to implant an embedded follicle into target skin, a cartridge disposed on the supporting part of the cylinder and configured to sequentially replace the implant unit, and a push rod configured to guide the implant unit to the nozzle and return to its original position when the follicle is implanted into the target skin.
    Type: Application
    Filed: November 14, 2019
    Publication date: May 21, 2020
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Tae Wuk BAE, Kyu Hyung KIM, Jung Wook SUH, Eun Chang CHOI, Chang Hyuk HONG
  • Patent number: 10642150
    Abstract: The present invention relates to a photomask and a method for manufacturing a column spacer for a color filter using the same, and according to one aspect of the present invention, a photomask is provided, which comprises a central region having a first transmittance, a first perimeter region surrounding the central region and having a second transmittance lower than the first transmittance, and a second perimeter region surrounding the first perimeter region and having the first transmittance.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: May 5, 2020
    Assignee: LG CHEM, LTD.
    Inventors: Dae Han Seo, Dong Chang Choi, Kwang Han Park, Sang Choll Han, Jae Jin Kim, Eun Joo Choi, Min Soo Song
  • Patent number: 10644284
    Abstract: An in-situ coin cell support device for transmission mode X-ray diffraction analysis capable of controlling temperature. The device includes a coin cell seating unit including a seating part for receiving an in-situ coin cell, a positive electrode tab coupled to the seating part and connected to a positive electrode of the in-situ coin cell, and a negative electrode tab coupled to the seating part and connected to a negative electrode of the in-situ coin cell, a housing having a heat-insulating function, which surrounds the coin cell seating unit such that the positive and negative electrode tabs extend outwards from the housing and which includes one side wall and an opposite side wall arranged opposite each other with the in-situ coin cell interposed therebetween, and a temperature control unit coupled to the exterior of the housing and including an inlet port, an outlet port, and a flow passage.
    Type: Grant
    Filed: April 3, 2018
    Date of Patent: May 5, 2020
    Assignee: Korea Institute of Science and Technology
    Inventors: Kyung Yoon Chung, Dong Hyun Kim, Liau Dieky Susanto, Jaeho Park, Jiwon Jeong, Hun-Gi Jung, Won Young Chang, Won Chang Choi, Byung Won Cho