Patents by Inventor John P. Dundon

John P. Dundon 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).

  • Method for the preparation of Leuco Crystal Violet Lactone
    Patent number: 4455435
    Abstract: Leuco Crystal Violet Lactone is prepared by condensing one molar proportion of each of N,N-dimethylaniline, p-dimethylaminobenzaldehyde, and m-dimethylaminobenzoic acid with 0-1 molar proportion of urea and 1-4 molar proportions of a strong acidic condensing agent.
    Type: Grant
    Filed: January 22, 1979
    Date of Patent: June 19, 1984
    Assignee: American Cyanamid Company
    Inventors: John P. Dundon, Erwin Klingsberg
  • Process for preparing aryl[4,4'-bis(di-loweralkyl-amino)benzhydryl]sulfones
    Patent number: 4210601
    Abstract: Aryl[4,4'-bis(di-loweralkylamino)benzhydryl]-sulfones are prepared by reacting a 4-di(loweralkylamino)benzaldehyde with a di(loweralkyl)aniline and an aryl sulfinate.
    Type: Grant
    Filed: January 22, 1979
    Date of Patent: July 1, 1980
    Assignee: American Cyanamid Company
    Inventors: John P. Dundon, Erwin Klingsberg, John H. Bright