Patents by Inventor Dong W. Yu

Dong W. Yu 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).

  • Process for producing phthalic acid esters
    Patent number: 4675434
    Abstract: A process for preparing phthalic acid esters of formula (I) which comprises reacting the phthalic acids of formula (II) with an aliphatic alcohol in the presence of a catalyst consisting essentially of the dialkyltinoxides of formula (III): ##STR1## wherein R and R.sub.1 are the same or different and include both straight and branch chain aliphatic alkyl groups containing 4 to 13 carbon atoms and R.sub.2 and R.sub.3 are straight or branch chain aliphatic alkyl groups containing 1 to 8 carbon atoms.
    Type: Grant
    Filed: November 15, 1984
    Date of Patent: June 23, 1987
    Assignee: Korea Advanced Institute of Science & Technology
    Inventors: Sung J. Uhm, Tae J. Lee, Eun S. Choi, Dong W. Yu