Patents by Inventor John K. Chan

John K. Chan 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 preparing N-alkyl-nitroanilines
    Patent number: 4289907
    Abstract: This invention relates to a process of preparing N-alkyl-nitroanilines selected from the group consisting of N-alkyl-mononitroanilines and N-alkyl-dinitroanilines by the O-alkylation of a nitrophenol to produce the corresponding alkoxy derivative, followed by reaction of the alkoxy derivative with alkylamine to produce the desired N-alkyl-nitroaniline.
    Type: Grant
    Filed: December 27, 1979
    Date of Patent: September 15, 1981
    Assignee: Union Carbide Corporation
    Inventor: John K. Chan
  • Preparation of organic sulfone compounds
    Patent number: 4248795
    Abstract: An improved process for preparing an organic sulfone compound by oxidizing the corresponding sulfide compound with an aqueous peracid solution.
    Type: Grant
    Filed: February 10, 1977
    Date of Patent: February 3, 1981
    Assignee: Union Carbide Corporation
    Inventor: John K. Chan
  • Process for preparing organothio-aldoxime compounds
    Patent number: 4144261
    Abstract: An improved process for preparing 1-organothio-aldoxime compounds by chlorinating the corresponding aldoxime and reacting the resulting 1-haloaldoxime with the sodium salt of a mercaptan, said process being conducted in an aqueous solvent containing from 5 to 75 percent by weight of a linear or cyclic polyhydric alcohol having from 2 to 20 carbon atoms.
    Type: Grant
    Filed: September 7, 1977
    Date of Patent: March 13, 1979
    Assignee: Union Carbide Corporation
    Inventor: John K. Chan
  • Method of producing biologically active compositions
    Patent number: 4138422
    Abstract: Biologically active compositions are prepared by reacting an active hydrogen containing precursor with an isocyanate compound in the presence of solid particulate matter.
    Type: Grant
    Filed: July 24, 1974
    Date of Patent: February 6, 1979
    Assignee: Union Carbide Corporation
    Inventors: John K. Chan, Erich Tobler, Herbert E. Johnson