Patents by Inventor Huey-Jiuan Yeh

Huey-Jiuan Yeh 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).

  • Ring-opening polymerization of cyclic ethers
    Patent number: 5371276
    Abstract: A method for preparing ester end-capped polyalkylene ether is disclosed. Cyclic ether monomers are subjected to ring-opening polymerzation at a temperature of 20.degree.-80.degree. C. and a pressure of 0-10 atm in the presence of a solid acid serving as catalyst and a mixture of acid and acid anhydride serving as a promoter. The solid acid is an oxide of group III and group IV elements and has been modified by sulfuric acid, ammonium sulfate or ammonium sulfite.
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: December 6, 1994
    Assignee: Industrial Technology Research Institute
    Inventors: Shiao-Jung Chu, Fu-Chen Liu, Ching-Tang Lin, Huey-Jiuan Yeh, Fu-Hsi Yu