Patents by Inventor Ming Hui Chu

Ming Hui Chu 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 for preparing polyether polyol and copolymer thereof
    Patent number: 6313262
    Abstract: The present invention is related to a method for preparing polyether polyol or copolymerized polyether polyol, which uses an acid catalyst consisting of heteropoly acidic salts and oxides and/or binders. It allows tetrahydrofuran and/or cyclic ether compounds to carry out the ring-opening polymerization or ring-opening copolymerization with/without telogen, and obtains polyether polyol or copolymerized polyether polyol. An acid catalyst is used in the present invention because of its low solubility in organic solvent, so its process is simpler and the catalyst is easy to recycle for repeated use. As well, its preparation process is highly advantageous.
    Type: Grant
    Filed: November 23, 1999
    Date of Patent: November 6, 2001
    Assignee: Dairen Chemical Corporation
    Inventors: Shien Chang Chen, Fu Shen Lin, June Yen Chou, Liang An Hsu, Ming Hui Chu, Chine Chung Huang, Ming Hsiung Shao
  • Process for producing cyclic ethers by liquid phase reaction
    Patent number: 5917061
    Abstract: This invention is directed to a process for producing cyclic ethers by liquid phase reaction, which comprises using a crystalline aluminosilicate zeolite as the catalyst, and subjecting an alkanediol to cyclodehydration at a temperature less than the boiling point of the alkanediol to obtain the corresponding cyclic ether.
    Type: Grant
    Filed: April 28, 1998
    Date of Patent: June 29, 1999
    Assignee: Dairen Chemical Corporation
    Inventors: Shien Chang Chen, Cheng Chang Chu, Fu Shen Lin, June Yen Chou, Ming Hui Chu