Patents by Inventor Bum-Seok Hyun

Bum-Seok Hyun 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).

  • Cryocooler with variable compression depending on variations in load
    Patent number: 9587860
    Abstract: A cryocooler, includes a cylinder filled with gas. A piston rectilinearly reciprocates inside of the cylinder and compresses or expands the gas. A connecting rod has a first side coupled to the piston and moves with the piston, and a second side having a first thread along an outer circumference thereof. A linear motor rectilinearly reciprocates a motor shaft toward the connecting rod in accordance with a control signal. A sleeve has two open sides, so that an end portion of the motor shaft can be supported by and inserted in one open side, and the second side of the connecting rod can be inserted in the other open side, and an inner circumference of the sleeve is formed with a second thread that engages with the first thread of the connecting rod and rotates to adjust a distance between the motor shaft and the connecting rod.
    Type: Grant
    Filed: July 22, 2013
    Date of Patent: March 7, 2017
    Assignee: KOREA AEROSPACE RESEARCH INSTITUTE
    Inventors: JuHun Rhee, Kyung-Hwan Lee, Bum-Seok Hyun, Eunsup Sim
  • CRYOCOOLER WITH VARIABLE COMPRESSION DEPENDING ON VARIATIONS IN LOAD
    Publication number: 20140020409
    Abstract: A cryocooler, includes a cylinder filled with gas. A piston rectilinearly reciprocates inside of the cylinder and compresses or expands the gas. A connecting rod has a first side coupled to the piston and moves with the piston, and a second side having a first thread along an outer circumference thereof. A linear motor rectilinearly reciprocates a motor shaft toward the connecting rod in accordance with a control signal. A sleeve has two open sides, so that an end portion of the motor shaft can be supported by and inserted in one open side, and the second side of the connecting rod can be inserted in the other open side, and an inner circumference of the sleeve is formed with a second thread that engages with the first thread of the connecting rod and rotates to adjust a distance between the motor shaft and the connecting rod.
    Type: Application
    Filed: July 22, 2013
    Publication date: January 23, 2014
    Applicant: KOREA AEROSPACE RESEARCH INSTITUTE
    Inventors: JuHun RHEE, Kyung-Hwan Lee, Bum-Seok Hyun, Eunsup Sim