Patents by Inventor Duck Jae Park

Duck Jae Park 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).

  • Helical antenna for portable phones and manufacturing method thereof
    Patent number: 6285340
    Abstract: A helical antenna having a simple structure and being made of cheap conductor to reduce the manufacturing cost, and a manufacturing method thereof. A helical antenna comprises a dielectric core, a conductive strip, a feeding conductor, and an external circuit. The dielectric core has a substantially cylindrical shape with an outer circumferential surface on which a spiral groove is formed. The conductive strip is deposited on the groove of the dielectric core. The feeding conductor is placed under the dielectric core and provides an electrical connection between the conductive strip and an external circuit. The antenna cover encloses the dielectric core and the feeding conductor.
    Type: Grant
    Filed: June 9, 1999
    Date of Patent: September 4, 2001
    Assignee: Ace Technology
    Inventors: Duck Jae Park, Jong Cheol Yun, Ki Duk Koo, Kyu Bok Lee, Jae Suk Sung