Patents by Inventor Herng-Tay Wu

Herng-Tay Wu 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 the preparation of substituted crotonic acid esters
    Publication number: 20030216594
    Abstract: According to the invention there is proposed a process for the preparation of 4,4,4-trifluoro-3-methylamino-crotonic acid esters by dehydrating trifluoroacetoacetic acid esters and methylamine in the presence of an inert reaction medium and of a C1-C4carboxylic acid, in which process the reaction is carried out at a temperature of from 75 to 100° C. without isolation of intermediates and the water that forms during the reaction is removed continuously from the reaction medium.
    Type: Application
    Filed: March 23, 2001
    Publication date: November 20, 2003
    Inventors: Reinhard Georg Hanreich, Herng-Tay Wu, Michael Allen Oliver, Dean Kent Hoglen
  • Process for making 2-amino-4, 6-dialkoxy-1, 3, 5-triazines
    Patent number: 5721364
    Abstract: A method is provided for making ammelide ethers, such as a 2-amino-4,6-dialkoxy-1,3,5-triazine. A 2-amino-4,6-dihalo-1,3,5-triazine (ADXT) is synthesized in the presence of an aromatic organic solvent, and reaction is effected directly between the (ADXT) synthesis mixture and an alkali metal C.sub.(1-4) alkoxide and C.sub.(1-4) alkanol, including contact through a static mixer. These ammelide ethers are useful as intermediates for making N-phenylsulfonyl-N-triazinylureas, which have herbicidal and growth regulating properties.
    Type: Grant
    Filed: December 13, 1996
    Date of Patent: February 24, 1998
    Assignee: Novartis Corporation
    Inventors: Dean Kent Hoglen, Heinz Peter Schwemlein, Herng-Tay Wu