Patents by Inventor Tae Yoon

Tae Yoon 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: 4136980
    Abstract: This invention relates to an improved mechanical pencil. More particularly, the invention concerns a mechanical pencil in which the back and forth movements of a writing implement are controlled by a carrier having a spiral guide travelling along the spiral grooves formed on the inside of the pencil barrel, the carrier being adapted to travel along the spiral grooves formed on the inside of the pencil barrel in response to the manual rotations of the cap holding one end of the supporting member.
    Type: Grant
    Filed: April 12, 1977
    Date of Patent: January 30, 1979
    Inventor: Tae Yoon Leem