Patents by Inventor Tae Hun CHOI

Tae Hun 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).

  • Publication number: 20140042209
    Abstract: A method for manufacturing a spiral groove metal pipe with a symmetrical structure comprises the steps of: supplying a metal strip successively; forming spiral grooves on the upper surface of the metal strip supplied at the metal strip supplying step in which the spiral grooves are repeatedly and symmetrically formed as the same pattern from side to side with the middle as the center with a shape of ‘’ symmetrically; forming a pipe in which its inner surface has spiral grooves formed at the spiral groove forming step and its outer surface has a smooth surface; welding the metal strip at the pipe forming step in such a way that opposite edges of the metal strip meet each other; and removing welding beads produced in the inner and outer surfaces of the metal strip by the welding step.
    Type: Application
    Filed: July 10, 2013
    Publication date: February 13, 2014
    Inventor: Tae Hun CHOI