Patents by Inventor Andras Rapi

Andras Rapi 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 cypermethrine isomers
    Patent number: 5153349
    Abstract: The invention relates to a process for the preparation of such isomer mixtures of cypermethrine of the Formula (I) ##STR1## wherein carbon atoms indicated by 1, 3 and .alpha. stand for a chiral carbon atom and the wavy line indicates cis or trans configuration related to the cyclopropane ring--which contains out of the theoretically possible 8-isomers of cypermethrine at least 95% of 1RtransS and 1StransR (Ib) isomer pair or only a mixture of 1RcisC and 1ScisR (Ia) and the isomer pair (Ib) of the ratio (Ia):(Ib)=55:45-25:75 by asymmetric transformation of second order performed in the presence of an amine base and solvent from a starting cypermethrine isomer mixture which contains next to the isomer pair (Ib) cis and other trans isomers or the isomer pair Ia+Ib at an undesired ratio.
    Type: Grant
    Filed: October 19, 1990
    Date of Patent: October 6, 1992
    Assignee: Chinoin Gyogyszer- es Vegyeszeti Termekek Gyara Rt.
    Inventors: Sandor Zoltan, Gyorgy Hidasi, Bela Bertok, Istavan Szekely, Janis Hajimichael, Sandor Botar, Lajos Nagy, Eva Somfai, Istvan Lak, Andras Rapi, Antal Gajary, Agnes Hegedus, Maria Tary