Patents by Inventor Istvan Polgar

Istvan Polgar 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).

  • Steroselective hydrogenation process
    Patent number: 5097031
    Abstract: The invention relates to a novel stereoselective process for the preparation of dihdyrolysergol from lysergol by hydrogenation in the presence of solvent and palladium catalyst applied on a carrier, which comprises hydrogenating lysergol in the presence of one or more aprotic solvent(s) containing tertiary nitrogen atom(s) and a palladium catalyst applied on activated carbon, and recovering the product obtained from the reaction mixture in a known manner.
    Type: Grant
    Filed: June 22, 1990
    Date of Patent: March 17, 1992
    Assignee: Richter Gedeon Vegyeszeti Gyar R.T.
    Inventors: Istvan Polgar, Jozsef Foldesi, Janos Kiss, Piroska Major nee Forstner, Karoly Molnar, Andras Sugar, Tamas Szen, Katalin Balogh nee Nemes
  • Reliable Raney catalyst composition and vessel for containing same
    Patent number: 5091355
    Abstract: A Raney catalyst composition which has ice as a solid carrier. The reaction involving the Raney catalyst of the invention is carried out by portionwise adding a Raney catalyst containing ice as solid carrier to the reaction mixture. The operation-safe cylindrical or angular vessel used for the storage and/or handling of the Raney catalyst has a conical casing or side walls joining to the bottom through a bend radius of greater than 0.5 mm. The vessel is covered by a tightly closing cap.
    Type: Grant
    Filed: September 21, 1990
    Date of Patent: February 25, 1992
    Assignee: Richter Gedeon Vegyeszeti Gyar Rt.
    Inventors: Imre Godla, Jozsef Foldesi, Istvan Polgar, Endre Gulyas, Istvan Gebhardt, Janos Kiss, Karoly Molnar, Andras Sugar, Pal Angyal, Ferenc Konok, Zoltan Marina