Patents by Inventor Peter Kalvin

Peter Kalvin 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 the synthesis of high purity 3,5-diamino-6-(2,3-dichlorophenyl) (1,2,4-triazine)
    Patent number: 7390899
    Abstract: The present invention relates to a new process for the synthesis of high purity 3,5-diamino-6-(2,3-dichlorophenyl)-1,2,4-triazine of formula (I) using 2,3-dichlorobenzoyl cyanide and an aminoguanidine salt as starting materials. 2,3-dichlorobenzoyl cyanide is reacted with 1-2 mol equivalent of aminoguanidine salt in 3-6 mol equivalent of methanesulfonic acid, then the obtained adduct of formula (IV) is transformed without isolation into the product with magnesium oxide.
    Type: Grant
    Filed: September 18, 2003
    Date of Patent: June 24, 2008
    Assignee: Richter Gedeon Vegyeszeti Gyar. RT.
    Inventors: Jozsef Neu, Tibor Gizur, Jozsef Törley, Janos Csabai, Ferenc Vegh, Peter Kalvin, Gabor Tarkanyi
  • Process for the synthesis of high purity3,5-diamino-6-(2,3-dichlorophenyl)-1,2,4-triazine
    Publication number: 20060178511
    Abstract: The present invention relates to a new process for the synthesis of high purity 3,5-diamino-6-(2,3-dichlorophenyl)-1,2,4-triazine of formula (I) using 2,3-dichlorobenzoyl cyanide and an aminoguanidine salt as starting materials. 2,3-dichlorobenzoyl cyanide is reacted with 1-2 mol equivalent of aminoguanidine salt in 3-6 mol equivalent of methanesulfonic acid, then the obtained adduct of formula (IV) is transformed without isolation into the product with magnesium oxide. In given case the obtained crude product can be recrystallized from a proper organic solvent.
    Type: Application
    Filed: September 18, 2003
    Publication date: August 10, 2006
    Inventors: Jozsef Neu, Tibor Gizur, Jozsef Torley, Ferenc Vegh, Peter Kalvin, Gabor Tarkanyi