Patents by Inventor Paul H. Liang

Paul H. Liang 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 pyridine sulfonamide
    Patent number: 5393734
    Abstract: A pyridine sulfonylurea herbicide, composition thereof and a method for its use that results in the control of blackgrass in cereal crops and general control of all plant growth.
    Type: Grant
    Filed: September 3, 1993
    Date of Patent: February 28, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Tarig A. Andrea, Paul H. Liang
  • Herbicidal pyridinesulfonylureas
    Patent number: 5393733
    Abstract: This invention relates to herbicidal pyridinesulfonylureas which are highly active as preemergence and postemergence herbicides.
    Type: Grant
    Filed: April 27, 1993
    Date of Patent: February 28, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Paul H. Liang
  • Herbicidal pyridinesulfonylureas
    Patent number: 5209770
    Abstract: This invention relates to herbicidal pyridinesulfonylureas which are highly active as preemergence and postemergence herbicides.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: May 11, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Paul H. Liang
  • Herbicidal pyridinesulfonylureas
    Patent number: 5102444
    Abstract: This invention relates to herbicidal pyridine-sulfonylureas which are highly active as preemergence and postemergence herbicides.
    Type: Grant
    Filed: April 12, 1990
    Date of Patent: April 7, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Paul H. Liang
  • Herbicidal pyridinesulfonylureas
    Patent number: 4808721
    Abstract: This invention relates to herbicidal pyridinesulfonylureas which are highly active as preemergence and postemergence herbicides.
    Type: Grant
    Filed: August 28, 1987
    Date of Patent: February 28, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Paul H. Liang
  • Herbicidal pyridinesulfonylureas
    Patent number: 4774337
    Abstract: This invention relates to herbicidal pyridine-sulfonylureas which are highly active as preemergence and postemergence herbicides.
    Type: Grant
    Filed: September 25, 1987
    Date of Patent: September 27, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Paul H. Liang
  • Herbicidal sulfonamides
    Patent number: 4764207
    Abstract: This invention relates to certain sulfonylurea compounds having a ring structure, which is attached ortho to the sulfonyl bridge through a double bond, agricultural compositions thereof and a method of their use as general preemergence and/or postemergence herbicides or plant growth regulants.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: August 16, 1988
    Assignee: E. I. DuPont De Nemours And Company
    Inventors: Joel R. Christensen, Paul H. Liang, Mark E. Thompson
  • Herbicidal sulfonamides
    Patent number: 4685955
    Abstract: This invention relates to certain sulfonylurea compounds having a ring structure, which is attached ortho to the sulfonyl bridge through a double bond, agricultural compositions thereof and a method of their use as general preemergence and/or postemergence herbicides or plant growth regulants.
    Type: Grant
    Filed: March 27, 1986
    Date of Patent: August 11, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Joel R. Christensen, Paul H. Liang, Mark E. Thompson