Patents by Inventor Istvan Csik

Istvan Csik 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 manufacture of pure isoquinoline derivatives
    Patent number: 4126615
    Abstract: In the production of perparine or papaverine and their hydrochlorides, the formation of impurities in the reaction mixture is suppressed by fractionating a 3,4-di-R-benzyl-cyanide in the presence of an organic base (e.g. pyridine, dimethylformamide, ethylenediamine or triethylamine) followed by hydrogenation with a Raney-nickel catalyst treated with aqueous ammonium carbonate solution. R is methoxy or ethoxy.
    Type: Grant
    Filed: December 7, 1976
    Date of Patent: November 21, 1978
    Assignee: Chinoin Gyogyszer es Vegyeszeti Termekek Gyara RT
    Inventors: Istvan Turcsan, Istvan Jelinek, Jozsef Ugrics, Istvan Csik, Eva Somfai, Iren Csaszar nee Toth