Patents by Inventor Chang Sung Seok

Chang Sung Seok 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).

  • Compact pipe specimen
    Patent number: 8549929
    Abstract: A compact pipe specimen applicable to a fracture toughness test used to evaluate physical properties of a pipe material is provided. The compact pipe specimen includes: a pipe having a notch portion formed in a circumferential direction and a crack portion formed at the edge of the notch portion; and first and second jigs having openings to which a pressurizing unit is coupled so as to cause a bending load on the pipe, having the notch portion therebetween, and attached to the exterior surface of the pipe, respectively. It is unnecessary to correct the influence of a constraint effect due to varying sizes and shapes of the specimen. There is no restriction to the curvature and thickness of a pipe. A fracture behavior of a pipe crack portion can be precisely simulated.
    Type: Grant
    Filed: October 31, 2008
    Date of Patent: October 8, 2013
    Assignee: Sungkyunkwan University Foundation for Corporate Collaboration
    Inventors: Chang Sung Seok, Kwang Sang Seon, Kwang Hyeon Lee, Soo Park, Haeng Cheol Cho
  • COMPACT PIPE SPECIMEN
    Publication number: 20110094307
    Abstract: A compact pipe specimen applicable to a fracture toughness test used to evaluate physical properties of a pipe material is provided. The compact pipe specimen includes: a pipe having a notch portion formed in a circumferential direction and a crack portion formed at the edge of the notch portion; and first and second jigs having openings to which a pressurizing unit is coupled so as to cause a bending load on the pipe, having the notch portion therebetween, and attached to the exterior surface of the pipe, respectively. It is unnecessary to correct the influence of a constraint effect due to varying sizes and shapes of the specimen. There is no restriction to the curvature and thickness of a pipe. A fracture behavior of a pipe crack portion can be precisely simulated.
    Type: Application
    Filed: October 31, 2008
    Publication date: April 28, 2011
    Applicant: Sungkyunkwan University Foundation for Corporate Collaboration
    Inventors: Chang Sung Seok, Sung Keun Cho, Haeng Cheol Cho, Kwang Sang Seon, Kwang Hyeon Lee, Soo Park
  • Limited slip differential with friction using a pressure generating device
    Patent number: 7559869
    Abstract: The present invention relates to a limited slip differential with friction using a pressure generating device. The limited slip differential includes a first side pinion gear and a second side pinion gear opposite to each other, a pair of differential pinion gears each of which is rotated in engagement with the first and second side pinion gears friction plates arranged at rear sides of the first and second side pinion gears friction plates arranged at rear sides of the first and second side pinion gears, and a pressure generating device having a cover gear and a piston gear and being constructed such that the cover gear and the piston gear engage with the second side pinion gear and first side pinion gear, respectively, and can be displaced away from each other in a longitudinal direction of the device.
    Type: Grant
    Filed: February 7, 2005
    Date of Patent: July 14, 2009
    Assignee: Sungkyunkwan University Foundation for Corporate Collaboration
    Inventor: Chang Sung Seok