Patents by Inventor Asim Kumar Sarkar

Asim Kumar Sarkar 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 a benzoxazinone
    Patent number: 7915406
    Abstract: The invention relates to a method for preparing a benzoxazinone comprising reacting an isatoic anhydride with an acylating compound in the presence of an N-alkyl imidazole, to a method for preparing a photo-stabilised composition, comprising adding a benzoxazinone and to the use of a benzoxazinone as a light-absorber or as a stabiliser for a light-sensitive compound.
    Type: Grant
    Filed: January 5, 2007
    Date of Patent: March 29, 2011
    Assignee: Temsa International Inc.
    Inventor: Asim Kumar Sarkar
  • Process for Preparing a Benzoxazinone
    Publication number: 20090030119
    Abstract: The invention relates to a method for preparing a benzoxazinone comprising reacting an isatoic anhydride with an acylating compound in the presence of an N-alkyl imidazole, to a method for preparing a photo-stabilised composition, comprising adding a benzoxazinone and to the use of a benzoxazinone as a light-absorber or as a stabiliser for a light-sensitive compound.
    Type: Application
    Filed: January 5, 2007
    Publication date: January 29, 2009
    Applicant: TEMSA INTERNATIONAL INC.
    Inventor: Asim Kumar Sarkar