Patents by Inventor Chi-wan Chen

Chi-wan Chen 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).

  • Use of paramagnetic metalloporphyrins as contrast agents for tumors in MRI imaging
    Patent number: 4986256
    Abstract: Water-soluble paramagnetic metalloporphyrins are used as contrast enhancing agents for magnetic resonance imaging. These agents exhibit excellent localization, non-toxicity and suprisingly high contrast enhancement in magnetic resonance imaging applications.
    Type: Grant
    Filed: February 28, 1985
    Date of Patent: January 22, 1991
    Assignee: The United States of America as represented by the Department of Health and Human Services
    Inventors: Jack S. Cohen, Chi-Wan Chen, Charles E. Myers, Miriam Sohn
  • Herbicidal sulfonamides
    Patent number: 4640704
    Abstract: This invention relates to N-(heterocyclicaminocarbonyl)-o-alkenylbenzenesulfonamides which are useful as agricultural chemicals.
    Type: Grant
    Filed: October 22, 1985
    Date of Patent: February 3, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Chi-wan Chen, Gregory W. Schwing
  • Herbicidal sulfonamides
    Patent number: 4582525
    Abstract: This invention relates to N-(heterocyclicaminocarbonyl)-o-alkenylbenzenesulfonamides which are useful as agricultural chemicals.
    Type: Grant
    Filed: August 3, 1984
    Date of Patent: April 15, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Chi-wan Chen, Gregory W. Schwing
  • Herbicidal alkenyl benzenesulfonamide
    Patent number: 4474601
    Abstract: This invention relates to N-(heterocyclicaminocarbonyl)-o-alkenylbenzenesulfonamides which are useful as agricultural chemicals.
    Type: Grant
    Filed: September 27, 1982
    Date of Patent: October 2, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Chi-wan Chen, Gregory W. Schwing
  • Herbicidal sulfonamides
    Patent number: 4368069
    Abstract: This invention relates to N-(heterocyclicaminocarbonyl)-o-alkenylbenzenesulfonamides which are useful as agricultural chemicals.
    Type: Grant
    Filed: May 28, 1981
    Date of Patent: January 11, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Chi-wan Chen, Gregory W. Schwing