Patents Assigned to Prom Limited
  • Process for the preparation of alkyl n-alkylanthranilate
    Patent number: 7368592
    Abstract: This invention is directed to a process of preparing alkyl N-alkylanthranilate, specially Methyl N-methylanthranilate, represented by Formula (I), in a one pot synthesis, using available and cheap commercial chemicals such as Isatoic anhydride, solid sodium hydroxide, dimethyl sulfate and methanol. Purity of the crude product is about 97% and yield 85%.
    Type: Grant
    Filed: October 4, 2000
    Date of Patent: May 6, 2008
    Assignee: Prom Limited
    Inventor: Carsten Berg
  • Process for the preparation of thioxanthones
    Patent number: 7126011
    Abstract: Processes are described for the preparation of thioxanthones (Formula I). A reactant mixture of a 2-chlorothiobenzoyl chloride (Formula II) and an aromatic compound (Formula III) is added to a slurry of a Friedel-Crafts catalyst in an organic Friedel-Crafts solvent.
    Type: Grant
    Filed: April 7, 2003
    Date of Patent: October 24, 2006
    Assignee: Prom Limited
    Inventor: Carsten Berg