Patents by Inventor Chen Yun

Chen Yun 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).

  • Coumarin derivatives, a method of preparing them and their use as intermediates
    Patent number: 5650456
    Abstract: This invention relates to coumarin derivatives of formula (I) ##STR1## where Z represents OR.sup.3 or NR.sup.4 R.sup.5,to their preparation, and to their use for the production of polymers with luminophors on their side chains.
    Type: Grant
    Filed: February 9, 1996
    Date of Patent: July 22, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Chen Yun, Rolf Wehrmann, Burkhard Kohler