Patents by Inventor Siew H. Chang

Siew H. Chang 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).

  • Herbicidal O-carbomethoxysulfonylurea
    Patent number: 4959095
    Abstract: The compound methyl 2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino]sulfonyl ]benzoate has high herbicidal activity and is particularly useful for weed control in plantation crops.
    Type: Grant
    Filed: October 19, 1988
    Date of Patent: September 25, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Siew H. Chang