Patents by Inventor Yiannakis Televantos

Yiannakis Televantos 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 preparing polyoxyalkylene polyether polyols having low levels of transition metals through double metal cyanide complex polyoxyalkylation
    Patent number: 5767323
    Abstract: Substantially transition metal-free polyoxyalkylene polyethers may be prepared by double metal cyanide complex-catalyzed oxyalkylation of a suitable hydric oxyalkylation initiator molecule by employing 15 ppm or less of a double metal cyanide complex oxyalkylation catalyst having a propylene oxide polymerization rate greater than 5 g propylene oxide/minute. The induction periods associated with oxyalkylation employing double metal cyanide complex catalysts may be reduced by preparing preactivated master batches and by increasing the oxyalkylation reactor temperature during at least the induction period.
    Type: Grant
    Filed: December 22, 1995
    Date of Patent: June 16, 1998
    Assignee: ARCO Chemical Technology, L.P.
    Inventors: Yiannakis Televantos, Bi Le-Khac