Patents by Inventor Moon Hwan Cho

Moon Hwan Cho 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).

  • Calix[4 ]arene dibenzo crown ethers, their preparation process and their use for the selective extraction of cesium ion
    Patent number: 6040462
    Abstract: Novel calix[4]arene dibenzo crown ethers useful to selectively extract cesium are represented by the formula: wherein R is a C.sub.1 -C.sub.10 normal alkyl, a phenyl or a methoxyphenyl, R' is hydrogen, p-tert-butyl or a C.sub.1 -C.sub.10 normal alkyl, R" is a C.sub.1 -C.sub.10 normal alkyl, and n is an integer of 0-2. The novel compound is prepared at high yields by introduction of benzene rings into the crown ether ring of calix[4]arene crown-6-ether. The calix[4]arene dibenzo crown ethers are superior in selective absorptivity for cesium ions by virtue of their 1,3-alternate conformational structure and thus, can be used as selective extractants able to separate cesium ions at a high efficiency.
    Type: Grant
    Filed: November 23, 1998
    Date of Patent: March 21, 2000
    Assignees: Korea Atomic Energy Research Institute, Korea Electric Power Corporation
    Inventors: Won Zin Oh, Kune Woo Lee, Wang Kyu Choi, Hyun Soo Park, Jong Seung Kim, Moon Hwan Cho, Jong Kook Kim