Patents by Inventor Hwa-Rim Choi

Hwa-Rim 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).

  • Method for stable oxygen isotope separation and its apparatus using membrane distillation
    Patent number: 7638059
    Abstract: The present invention relates to an oxygen isotope separation system and a method therefor. More specifically, the invention relates to a newly invented pressure-driven AGMD (Air Gap Membrane Distillation) system applied to a multi-stage membrane distillation cells which can produce an oxygen isotope effectively and economically, and a method therefor. The invention provides an oxygen isotope separation system including a number of Air Gap Membrane Distillation (AGMD) permeation cells connected in series to separate a feed into a product and a tail, wherein each of the AGMD cell is connected at a tail outlet with a reflux pump and at a product outlet, whereby the product from (i?1)th cell and the tail from (i+1)th cell are pumped as the feed into ith cell.
    Type: Grant
    Filed: February 2, 2007
    Date of Patent: December 29, 2009
    Assignee: Korea Atomic Energy Research Institute
    Inventors: JaeWoo Kim, Hwa-Rim Choi, Dae-Shik Chang, Yun-Young Choi
  • Method for stable oxygen isotope separation and its apparatus using membrane distillation
    Publication number: 20080185283
    Abstract: The present invention relates to an oxygen isotope separation system and a method therefor. More specifically, the invention relates to a newly invented pressure-driven AGMD (Air Gap Membrane Distillation) system applied to a multi-stage membrane distillation cells which can produce an oxygen isotope effectively and economically, and a method therefor. The invention provides an oxygen isotope separation system including a number of Air Gap Membrane Distillation (AGMD) permeation cells connected in series to separate a feed into a product and a tail, wherein each of the AGMD cell is connected at a tail outlet with a reflux pump and at a product outlet, whereby the product from (i?1)th cell and the tail from (i+1)th cell are pumped as the feed into ith cell.
    Type: Application
    Filed: February 2, 2007
    Publication date: August 7, 2008
    Applicant: KOREA ATOMIC ENERGY RESEARCH INSTITUTE
    Inventors: JaeWoo Kim, Hwa-Rim Choi, Dae-Shik Chang, Yun-Young Choi