Patents by Inventor Ki Up Cha

Ki Up 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).

  • Apparatus and method for designing rifling rate to increase lifespan of gun barrel
    Patent number: 10823521
    Abstract: An apparatus for designing a rifling rate to increase a lifespan of a gun barrel includes: a node selection module selecting and distributing the predetermined number of node points according to preset constraints between preselected starting and end rifling angles; a sorting module sorting distributed node points; and a profile generation module calculating a rifling rate curve using sorted node points, and generating a rifling rate profile using the rifling rate curve.
    Type: Grant
    Filed: May 28, 2019
    Date of Patent: November 3, 2020
    Assignee: AGENCY FOR DEFENSE DEVELOPMENT
    Inventors: Seil An, Yunjung Oh, Ki-Up Cha
  • APPARATUS AND METHOD FOR DESIGNING RIFLING RATE TO INCREASE LIFESPAN OF GUN BARREL
    Publication number: 20200149835
    Abstract: An apparatus for designing a rifling rate to increase a lifespan of a gun barrel includes: a node selection module selecting and distributing the predetermined number of node points according to preset constraints between preselected starting and end rifling angles; a sorting module sorting distributed node points; and a profile generation module calculating a rifling rate curve using sorted node points, and generating a rifling rate profile using the rifling rate curve.
    Type: Application
    Filed: May 28, 2019
    Publication date: May 14, 2020
    Inventors: Seil AN, Yunjung OH, Ki-Up CHA
  • Rifling angle calculating method
    Patent number: 8635797
    Abstract: A rifling angle calculating method according to the present invention expands a rifling angle by combining a Fourier function and a polynomial function to take only the advantages of the two functions, and thus boundary conditions at the start and end points of the rifling angle may be faithfully satisfied, and an optimum rifling angle for minimizing the maximum rifling force may be calculated.
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: January 28, 2014
    Assignee: Agency for Defense Development
    Inventors: Ki Up Cha, Young Hyun Lee, Chang Ki Cho
  • Rifling Angle Calculating Method
    Publication number: 20120192475
    Abstract: A rifling angle calculating method according to the present invention expands a rifling angle by combining a Fourier function and a polynomial function to take only the advantages of the two functions, and thus boundary conditions at the start and end points of the rifling angle may be faithfully satisfied, and an optimum rifling angle for minimizing the maximum rifling force may be calculated.
    Type: Application
    Filed: January 26, 2012
    Publication date: August 2, 2012
    Inventors: Ki Up Cha, Young Hyun Lee, Chang Ki Cho