Patents by Inventor Peter Bencsik

Peter Bencsik 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 preparation of optically active cyclopropane carboxylic acids
    Patent number: 4508919
    Abstract: The invention relates to a process for the preparation of enantiomers of trans vinyl-cyclopropane carboxylic acids of the formula I, ##STR1## wherein R is a methyl group or chlorine atom, by resolution of racemic trans compound or mixture of racemic cis and trans compounds by using (+)- or (-)-N-(1-formamido-2,2,2-trichloroethyl)-piperazine as a resolving agent in a polar solvent then separating the crystallizing salt of (+)-trans carboxylic acid and (-)-resolving agent or (-)-trans carboxylic acid and (+)-resolving agent from the mother liquor by filtration and obtaining the enantiomers by acidifying the mother liquor or the salts suspended in water followed by extraction with a solvent and evaporation.The products so obtained may be used as starting materials for the preparation of insecticides.
    Type: Grant
    Filed: November 25, 1983
    Date of Patent: April 2, 1985
    Assignee: Chinoin Gyogyszer es Vegyeszeti Termekek Gyara Rt.
    Inventors: Elemer Fogassy, Laszlo Toke, Ferenc Faigl, Rudolf Soos, Jozsef Bozzay, Rezso Kolta, Jozsef Nemes, Peter Bencsik