Patents by Inventor Hwan-Gyu Lee

Hwan-Gyu Lee 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: 11826927
    Abstract: Disclosed is a recycling apparatus for a cross-linked polyethylene resin using a twin screw extruder. The recycling apparatus for a cross-linked polyethylene resin using a twin screw extruder according to an embodiment of the present disclosure includes: a raw material supply unit configured to supply a raw material that is a cross-linked polyethylene resin; and a twin screw extruder configured to receive the raw material from the raw material supply unit, the twin screw extruder including a cylinder and a twin screw installed inside the cylinder to rotate in the same direction, the twin screw extruder being configured to de-crosslink and recycle the raw material under a de-crosslinking reaction temperature and reaction pressure atmosphere while continuously transporting the raw material along the twin screw by the rotation of the twin screw.
    Type: Grant
    Filed: October 14, 2021
    Date of Patent: November 28, 2023
    Assignee: Korea Institute of Science and Technology
    Inventors: Soon Man Hong, Hang Kyu Cho, Seung Sang Hwang, Chong Min Koo, Seon Joon Kim, Albert Lee, Hwan Gyu Lee, Junpyo Hong
  • Publication number: 20220339820
    Abstract: Disclosed is a recycling apparatus for a cross-linked polyethylene resin using a twin screw extruder. The recycling apparatus for a cross-linked polyethylene resin using a twin screw extruder according to an embodiment of the present disclosure includes: a raw material supply unit configured to supply a raw material that is a cross-linked polyethylene resin; and a twin screw extruder configured to receive the raw material from the raw material supply unit, the twin screw extruder including a cylinder and a twin screw installed inside the cylinder to rotate in the same direction, the twin screw extruder being configured to de-crosslink and recycle the raw material under a de-crosslinking reaction temperature and reaction pressure atmosphere while continuously transporting the raw material along the twin screw by the rotation of the twin screw.
    Type: Application
    Filed: October 14, 2021
    Publication date: October 27, 2022
    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Soon Man HONG, Hang Kyu CHO, Seung Sang HWANG, Chong Min KOO, Seon Joon KIM, Albert LEE, Hwan Gyu LEE, Junpyo HONG
  • Patent number: 7628006
    Abstract: Disclosed is an abrupt opening apparatus of a pressurized chamber in an intended procedure to accomplish thrust termination for a stage separation of the solid rocket motor. It can open trust termination ports with simple mechanical structure to thereby terminate the normal thrust of a nozzle reliably, if it is intended to terminate the normal thrust produced from the nozzle of the rocket motor to thereby impede the forward movement of the rocket motor by producing the reverse thrust. The thrust termination device for the rocket motor comprises a closure 210 for closing the thrust termination ports in an air-tight structure; a snap ring 220 for supporting the closure 210; a wedge 230 arranged between both free ends of the snap ring; a wedge fixing plate 240 for fixing the wedge; and, a pulling wire 250 linked to the wedge at one end thereof for extracting the wedge by being drawn when the thrust termination is performed.
    Type: Grant
    Filed: November 1, 2006
    Date of Patent: December 8, 2009
    Assignee: Agency For Defense Development
    Inventors: Hwan-Gyu Lee, Shin-Hoe Kim, Hong-Been Chang, Moon-Joong Kang
  • Patent number: 7614816
    Abstract: An anti-rolling device of a ball and socket joint prevents the rolling movement of a moving body coupled to the ball effectively without hindering omni-directional tilt rotational movement of the moving body, i.e. a moving part relative to the socket, a fixing part. The anti-rolling device comprises: a bracket on the moving part that is fixed to the circumference of the moving body; a guide channel whose upper part is pivoted to the bracket on the moving part; a sliding bar coupled to the guide channel in a way being possible to be slid thereinto; and a bracket on the fixing part which is mounted on the fixing part and coupled with the lower part of the sliding bar.
    Type: Grant
    Filed: November 1, 2006
    Date of Patent: November 10, 2009
    Assignee: Agency for Defense Development
    Inventors: Hwan-Gyu Lee, Sang-Youn Lee
  • Patent number: 7367810
    Abstract: The present invention relates to a strain gauge interfacing cable connector for selective wiring. A DIP switch 120 is disposed on a cable 110 of the cable connector, and electric wires and the DIP switch 120 are wired in a given arrangement. Accordingly, a variety of wiring systems can be implemented using a minimal number of electric wires through mechanical manipulation of the DIP switch 120 and minimal artificial wiring modification. The cable connector includes a cable 110 for containing a plurality of electric wires; a commercial connector 140; and a DIP switch 120 disposed on the cable 110 of a location adjacent to the commercial connector 140 of the cable, whereby a predetermined internal wiring can be switched by selectively manipulating switch control units 122 of the DIP switch 120 depending on a use.
    Type: Grant
    Filed: November 1, 2006
    Date of Patent: May 6, 2008
    Assignee: Agency for Defense Development
    Inventors: Hwan-Gyu Lee, Shin-Hoe Kim
  • Publication number: 20070137176
    Abstract: Disclosed is an abrupt opening apparatus of a pressurized chamber in an intended procedure to accomplish thrust termination for a stage separation of the solid rocket motor. It can open trust termination ports with simple mechanical structure to thereby terminate the normal thrust of a nozzle reliably, if it is intended to terminate the normal thrust produced from the nozzle of the rocket motor to thereby impede the forward movement of the rocket motor by producing the reverse thrust. The thrust termination device for the rocket motor comprises a closure 210 for closing the thrust termination ports in an air-tight structure; a snap ring 220 for supporting the closure 210; a wedge 230 arranged between both free ends of the snap ring; a wedge fixing plate 240 for fixing the wedge; and, a pulling wire 250 linked to the wedge at one end thereof for extracting the wedge by being drawn when the thrust termination is performed.
    Type: Application
    Filed: November 1, 2006
    Publication date: June 21, 2007
    Applicant: Agency For Defense Development
    Inventors: Hwan-Gyu Lee, Shin-Hoe Kim, Hong-Been Chang, Moon-Joong Kang
  • Publication number: 20070117438
    Abstract: The present invention provides an antirolling device of a ball and socket joint, which is to prevent the rolling movement of a moving body coupled to the ball effectively without hindering omnidirectional tilt rotational movement of the moving body, i.e. a moving part relative to the socket, a fixing part. Specifically, the antirolling device comprises: a bracket on the moving part (130) that is fixed to the circumference of the moving body; a guide channel (140) whose upper part is pivoted to the bracket on the moving part (130); a sliding bar (150) coupled to the guide channel in a way being possible to be slid thereinto; and a bracket on the fixing part (160) which is mounted on the fixing part and coupled with the lower part of the sliding bar.
    Type: Application
    Filed: November 1, 2006
    Publication date: May 24, 2007
    Applicant: Agency For Defense Development
    Inventors: Hwan-Gyu Lee, Sang-Youn Lee
  • Publication number: 20070105434
    Abstract: The present invention relates to a cable connector for selective wiring. A DIP switch is disposed on a cable adjacent to a commercial connector of the cable connector, and electric wires and the DIP switch are wired in a given arrangement. Accordingly, a variety of wiring systems can be implemented using a minimal number of electric wires through mechanical manipulation of the DIP switch and minimal artificial wiring modification. The cable connector according to an embodiment of the present invention includes a cable for containing a plurality of electric wires; a commercial connector; and a DIP switch disposed on the cable of a location adjacent to the commercial connector of the cable, whereby a predetermined internal wiring can be switched by selectively manipulating switch control units 122 depending on a use. The cable connector may further include a jump wiring disposed on the DIP switch.
    Type: Application
    Filed: November 1, 2006
    Publication date: May 10, 2007
    Applicant: Agency For Defense Development
    Inventors: Hwan-Gyu Lee, Shin-Hoe Kim