Patents by Inventor Mi H. Yi

Mi H. Yi 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 of preparing polyimide foam with excellent flexibility properties
    Patent number: 6057379
    Abstract: A method of preparing polyimide foam produces a foam with excellent flexibility properties. The method of preparing polyimide foam is performed by foaming polyimide percursor which is prepared by employing linear aliphatic diamine and aromatic diamine containing 4 to 12 carbon atoms, at specific weight ration into the esterified reaction mixture prepared by reacting an aromatic carboxylic acid or its anhydride with excess amount of an alcohol compound. The polyimide foam produced by the method described retins superior characteristics of conventional polyimide foams and in addition have excellent flexibility so that it is used widely as adiabatic material, acoustical absorbent and cushion material in the aerospace industry, submarine and express trains etc.
    Type: Grant
    Filed: June 23, 1999
    Date of Patent: May 2, 2000
    Assignee: Korea Research Institute of Chemical Technology
    Inventors: Kil Y. Choi, Jae H. Lee, Sung G. Lee, Mi H. Yi, Seung S. Kim