Patents by Inventor Vladimir Avgustovich Yanshevsky

Vladimir Avgustovich Yanshevsky 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).

  • Method for preparing 2,6-ditert.butylphenol
    Patent number: 4122289
    Abstract: A method for preparing 2,6-ditert.butylphenol which comprises alkylation of phenol in the presence of monotert.-butylphenol and a catalyst, viz. aluminium dissolved in phenol with gradually lowering the process temperature from 120.degree. to 50.degree. C and reducing the concentration of isobutylene in the mixture of isomeric butenes from 80 to 1.5 mol.%, followed by isolation of the desired product.The method according to the present invention makes it possible to achieve a high degree of conversion of isobutylene without impairing quality of the desired product. The amount of by-products formed in the process is 2-3 times as less as in the prior art methods.
    Type: Grant
    Filed: August 5, 1977
    Date of Patent: October 24, 1978
    Inventors: Jury Ivanovich Michurov, Vladimir Avgustovich Yanshevsky, Rufina Alexandrovna Filippova, Yakov Abramovich Gurvich, Igor Jurievich Logutov, Sofya Alexandrovna Egoricheva, Izrail Markovich Belgorodsky, Sergei Gerasimovich Vyborov
  • Method of producing 2,2 '-methylenebis(4,6-dialkylphenols)
    Patent number: 4087469
    Abstract: A method of producing 2,2'-methylenebis(4,6-dialkylphenols) residing in that 2,4-dialkylphenols interact with acetals in the presence of an acid catalyst at a temperature from 30.degree. C to 140.degree. C with the formation of a reaction mixture containing the desired product and with subsequent separation of the desired product from said mixture, the starting reagents being taken in amounts of 1 mole of 2,4-dialkylphenol per 1-10 moles of acetal.The method is technologically simple and accomplished without the formation of waste water.
    Type: Grant
    Filed: December 16, 1975
    Date of Patent: May 2, 1978
    Inventors: Yakov Abramovich Gurvich, Alexandr Afroimovich Grinberg, Alexandr Grigorievich Liakumovich, Jury Ivanovich Michurov, Olga Fedorovna Starikova, Vladimir Avgustovich Yanshevsky, Simona Tevievna Kumok, Evgeny Lvovich Styskin, Grigory Iosifich Rutman
  • Method for preparing dicarboxylic acids
    Patent number: 3979450
    Abstract: A method for preparing dicarboxylic acids by subjecting cycloolefins to ozonolysis in a medium of lower monocarboxylic acids so as to form an ozonalyzate; treating the ozonalyzate with a solution of hydrogen peroxide; passing the thus obtained mixture through a solid acid catalyst, such as an Amberlite IR-120 cation-exchange resin; and subjecting the thus obtained catalyzed product first to thermal treatment at a temperature of from 50.degree. to 80.degree.C and then to thermal decomposition at a temperature of from 90.degree. to 110.degree.C to form desired dicarboxylic acids such as succinic, suberic or 1,10-decanedicarboxy acids, depending on the starting cycloolefin, in a yield 98 per cent of the theoretical value and of 99.5 per cent purity.
    Type: Grant
    Filed: February 8, 1973
    Date of Patent: September 7, 1976
    Inventors: Jury Leonidovich Moskovich, Jury Nikolaevich Juriev, Viktor Karlovich Tsyskovsky, Ljudmila Vasilievna Berezova, Nokhum Davidovich Gilchenok, Vladimir Avgustovich Yanshevsky, Dmitry Vasilievich Mushenko, Evgeny Semenovich Zelikman, Rufina Alexandrovna Filippova, Vladimir Leonidovich Klimenko, Valerian Mikhailovich Sobolev