Patents by Inventor Ferenc Faigl

Ferenc Faigl 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 separation of optical isomers of racemic 3-alkylpiperidine-carboxylic acid ethyl esters
    Patent number: 11091436
    Abstract: The subject-matter of the invention is process for the separation of optical isomers of racemic 3-alk-3-carboxylic acid ethyl esters of formula rac-I with the resolving agent (II) (?)-2,3:4,5-di-O-izopropylidene-2-keto-L-gulonic acid (hereinafter: diacetone-L-ketogulonic acid).
    Type: Grant
    Filed: March 12, 2018
    Date of Patent: August 17, 2021
    Assignee: RICHTER GEDEON NYRT.
    Inventors: Ferenc Faigl, Béla Mátravölgyi, Ágnes Mizsák
  • Process for the Separation of Optical Isomers of Racemic 3-Alkylpiperidine-Carboxylic Acid Ethyl Esters
    Publication number: 20200131126
    Abstract: The subject-matter of the invention is process for the separation of optical isomers of racemic 3-alk-3-carboxylic acid ethyl esters of formula rac-I with the resolving agent (II) (?)-2,3:4,5-di-O-izopropylidene-2-keto-L-gulonic acid (hereinafter: diacetone-L-ketogulonic acid).
    Type: Application
    Filed: March 12, 2018
    Publication date: April 30, 2020
    Inventors: Ferenc FAIGL, Béla MÁTRA VÖLGYI, Ágnes MIZSÁK
  • Diastereomer salts of phenylalanine and N-acyl derivatives thereof and process for the separation of optically active phenylalanine and N-acyl derivatives thereof
    Patent number: 4642205
    Abstract: The present invention relates to the separation of optically active phenylalanine and N-acyl derivatives thereof and novel diastereomer salts of the said compounds.According to the invention a racemic compound of the formula ##STR1## is reacted with an optically active resolving agent of the formula ##STR2## in a polar solvent and/or a mixture of solvents comprising at least one apolar solvent and optionally an achiral acid or base, thereafter(a) when using the D-isomer of the resolving agent of the formula II, the crystalline diastereomer salt formed with the L-isomer of the compound of the formula I is separated, or(b) when using the L-isomer of the resolving agent of the formula II, the crystalline diastereomer salt formed with the D-isomer of the compound of the formula I is separated, andthe enantiomers of the compound of the formula I from the diastereomer salt or the mother liquor are liberated by the aid of an achiral acid or base and the optically active product is separated in crystalline form.
    Type: Grant
    Filed: November 18, 1985
    Date of Patent: February 10, 1987
    Assignee: Alkaloida Vegyeszeti Gyar
    Inventors: Maria Acs, Ferenc Faigl, Elemer Fogassy
  • Process for the separation of isomeric cyclopropane-carboxylic acids
    Patent number: 4599444
    Abstract: The invention relates to a new process for separating the four stereoisomers of the cyclopropanecarboxylic acids of the formula ##STR1## wherein R stands for a methyl group or a halogen atom.
    Type: Grant
    Filed: February 17, 1984
    Date of Patent: July 8, 1986
    Assignee: Chinoin Gyogyszer es Vegyeszeti Termekek Gyara Rt.
    Inventors: Elemer Foggassy, Ferenc Faigl, Rudolf Soos, Jozsef Rakoczi
  • 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