Patents by Inventor Choong E. Song

Choong E. Song 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).

  • Liquid fire extinguishing composition
    Patent number: 5219474
    Abstract: A liquid fire extinguishing composition is obtained by mixing a C.sub.1 -C.sub.5 halogenated alkane such as Halone 1301 (CF.sub.3 Br), Halone 1211 (CF.sub.2 ClBr), or a mixture thereof with an organophosphorus compound, or the mixture thereof for a wide variety of a fire extinguishment and no residues after fire extinguishing.
    Type: Grant
    Filed: August 8, 1990
    Date of Patent: June 15, 1993
    Assignee: Korea Institute of Science and Technology
    Inventors: Choong E. Song, In O. Kim, Jae K. Lee, Tae K. Kim, Sang G. Lee
  • Process for preparing d-2-(6-methoxy-2-naphthyl)-propionic acid and intermediate thereof
    Patent number: 5179208
    Abstract: A process for the prepaation of d-2-(6-methoxy-2-naphthyl)-propionic acid of formula (I) used as nonsteroid antipyretic analgesics, which comprises reacting oxazolidinone of formula (II) with 6-methoxy-2-naphthylacetchloride of formula (IV), methylizing [N-(y-methoxy-2-naphthyl)acetyl]-oxazolidinone of formula (N), and reacting[N-(2S)-2-(6-methoxy-2-naphthyl)-propionyl]-oxazolidinone of formula (VI) in alkali metal hydroxy, and intermediate compound obtained by the process, [N-(6-methoxy-2-naphthyl)acetyl]-oxazolidinone of formula (V) and [N-(2S)-2-(6-methoxy-2-naphthyl)-propionyl]-oxazolidinone (VI) ##STR1## wherein R.sup.1 is methyl, isopropyl, secondary-butyl, tert-butyl, benzyl, or phenyl group, and R.sup.2 is hydrogen or phenyl group.
    Type: Grant
    Filed: May 28, 1992
    Date of Patent: January 12, 1993
    Assignee: Korea Institute of Science and Technology
    Inventors: In O. Kim, Choong E. Song, Jae K. Lee
  • Process for preparing D-2-(6-methoxy-2-naphthyl)-propionic acid and intermediate thereof
    Patent number: 5145993
    Abstract: A process for the preparation d-2-(6-methoxy-2-naphthyl) propionic acid of formula (I) used as nonsteroid antipyretic analgesics, which comprises reacting oxazolidinone of formula (II) with 6-methoxy-2-naphthylacetchloride of formula (IV), methylizing [N-(6-methoxy-2-naphthyl)acetyl]-oxazolidinone of formula (V), and reacting [N-(2S)-2-(6-methoxy-2-naphthyl)-propionyl]-oxazolidinone of formula (VI) in alkali metal hydroxy, and intermediate compound obtained by the process, ]N-(6-methoxy-2-naphthyl)acetyl]-oxazolidionone of formula (V) and [N-(2S))-2-(6-methoxy-2-naphthyl)-propionyl]-oxazolidinone (VI).
    Type: Grant
    Filed: January 25, 1991
    Date of Patent: September 8, 1992
    Assignee: Korea Institute of Science and Technology
    Inventors: In O. Kim, Choong E. Song, Jae K. Lee