Patents by Inventor Simon Lingqi Xu

Simon Lingqi Xu 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 making oximes and use thereof to prepare cyclic urea fungicides
    Patent number: H1809
    Abstract: An advantageous process for preparing agriculturally suitable precursor compositions containing a compound of Formula IV is disclosed. The process involves (a) reacting a compound of Formula V with a nitrosating agent to provide a diazonium ion of Formula Va, (b) reacting the diazonium ion with a compound of Formula VI in the presence of a copper salt catalyst to obtain a reaction product containing the compound of Formula IV and greater than 100 ppm copper (based on the weight of Formula IV compound), and (c) separating copper from the Formula IV compound to obtain a purified product composition containing the compound of Formula IV and less than 10 ppm copper (based on the weight of Formula IV compound).
    Type: Grant
    Filed: April 8, 1998
    Date of Patent: October 5, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Charles De Witt Adams, George Chihshu Chiang, Simon Lingqi Xu