Patents by Inventor Hee Duk PARK

Hee Duk 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).

  • Method and apparatus for vacuum process of isostatic pressing of powder material
    Patent number: 8690561
    Abstract: A method for a vacuum process of isostatic pressing of powder material comprises preparing an explosive charged rubber bag by charging a rubber bag with powder, forming a vacuum environment by putting the explosive charged rubber bag in a vacuum box, sealing an inlet of the explosive charged rubber bag which is in a vacuum state, and maintaining the vacuum state by putting the explosive charged rubber bag in a fluid contained in a reservoir by a predetermined depth in a state that the inlet of the explosive charged rubber bag has been sealed.
    Type: Grant
    Filed: October 4, 2010
    Date of Patent: April 8, 2014
    Assignee: Agency for Defense Development
    Inventors: Jin Sung Lee, Hee Duk Park, Hee Sul Sa
  • METHOD AND APPARATUS FOR VACUUM PROCESS OF ISOSTATIC PRESSING OF POWDER MATERIAL
    Publication number: 20120025409
    Abstract: A method for a vacuum process of isostatic pressing of powder material comprises preparing an explosive charged rubber bag by charging a rubber bag with powder, forming a vacuum environment by putting the explosive charged rubber bag in a vacuum box, sealing an inlet of the explosive charged rubber bag which is in a vacuum state, and maintaining the vacuum state by putting the explosive charged rubber bag in a fluid contained in a reservoir by a predetermined depth in a state that the inlet of the explosive charged rubber bag has been sealed.
    Type: Application
    Filed: October 4, 2010
    Publication date: February 2, 2012
    Applicant: AGENCY FOR DEFENSE DEVELOPMENT
    Inventors: Jin Sung LEE, Hee Duk PARK, Hee Sul SA