Patents by Inventor Doh Riu

Doh Riu 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 producing polycarbosilane using zeolite as catalyst
    Publication number: 20050014964
    Abstract: The present invention is related to a method of producing polycarbosilane by heating polydimethylsilane at low pressure within the range of 320˜450° C. using zeolite having the Si/Al or Si/B ratio of 1˜200 as catalyst. This invention uses a zeolite with the structure of ZSM-5, ZSM-11, ZSM-12, zeolite X and zeolite Y, which has the Si/Al or Si/B ratio of 1˜200, as catalyst. When polycarbosilane is produced using a specific zeolite as catalyst, Si/Al or Si/B ratio can be adjusted at any proportion, enabling acidity control of catalyst, and therefore the molecular weight of final products can be easily controlled and the product yield can be improved, compared to conventional solid acid catalysts.
    Type: Application
    Filed: May 21, 2004
    Publication date: January 20, 2005
    Inventors: Hong Park, Dong Lim, Kwang Lim, Young Kim, Doh Riu, Hyung Kim, Dong Shin, Soo Kim, Kyung Kim, Hyun Shin, Dae Cho