Patents by Inventor Donald Joseph Dumas

Donald Joseph Dumas 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).

  • Patent number: 5990315
    Abstract: The present invention provides a process for the preparation of N-[2,4-dichloro-5-[4-(difluoromethyl)-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4- triazol-1-yl]phenyl]methanesulfonamide (I) which comprises reacting 2-(5-amino-2,4-dichlorophenyl)-4-(difluoromethyl)-2,4-dihydro-5-methyl-3H- 1,2,4-triazol-3-one (II) with methanesulfonyl chloride in the presence of a catalytic amount of a source of soluble halide.
    Type: Grant
    Filed: April 30, 1999
    Date of Patent: November 23, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Donald Joseph Dumas
  • Patent number: 5811585
    Abstract: A process for preparing 5-chloro-2,3-dihydro-1H-inden-1-one comprising contacting 3-chloro-1-(chlorphenyl)-1-propanone with a catalyst selected from sulfuric acid and solid acid catalysts.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: September 22, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Donald Joseph Dumas, Sourav Kumar Sengupta, David Richard Corbin
  • Patent number: H1705
    Abstract: A process for the preparation of 2-carboalkoxy-1-indanones of Formula I from 1-indanones of Formula II using a dialkyl carbonate and an alkali metal alkoxide is provided. This process is superior to the prior art in that it avoids pyrophoric reagents such as sodium hydride, and proceeds in high chemical yield and product quality. The invention provides a novel process to an important intermediate in the preparation of arthropodicidal carboxanilides of commercial interest. ##STR1## wherein: R.sup.1, R.sup.2 and M are defined in the specification.
    Type: Grant
    Filed: April 28, 1997
    Date of Patent: January 6, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Donald Joseph Dumas, William Christopher Hollinsed