Patents by Inventor David Leonov

David Leonov 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).

  • Publication number: 20130261303
    Abstract: The present invention provides a process for reacting between a phenol derivative and an aromatic substrate under phenolate forming conditions comprising the following steps: (a) reacting a phenol derivative with a base in a polar organic solvent to obtain a phenolate salt, wherein water is removed from the reaction mixture during the reaction, (b) adding the aromatic substrate to the reaction mixture obtained in step (a), (c) heating the reaction mixture of step (b) to a temperature in the range of 80° to 1300° C., preferably, 90° to 1000° C. for 2 to 7 hours to obtain a phenoxy substituted aromatic substrate, (d) removing the solvent from the mixture of step (c) and optionally further isolating and purifying the phenoxy substituted aromatic substrate. Optionally, the removal of water during step (a) is in conjunction with partial removal of the organic solvent.
    Type: Application
    Filed: May 30, 2013
    Publication date: October 3, 2013
    Applicant: MAKHTESHIM CHEMICAL WORKS, LTD.
    Inventors: David OVADIA, Raya STURKOVICH, David LEONOV
  • Patent number: 8471013
    Abstract: The present invention provides a process for reacting between a phenol derivative and an aromatic substrate under phenolate forming conditions comprising the following steps: (a) reacting a phenol derivative with a base in a polar organic solvent to obtain a phenolate salt, wherein water is removed form the reaction mixture during the reaction, (b) adding the aromatic substrate to the reaction mixture obtained in step (a), (c) heating the reaction mixture of step (b) to a temperature in the range of 80° to 1300° C., preferably, 90° to 1000° C. for 2 to 7 hours to obtain a phenoxy substituted aromatic substrate, (d) removing the solvent from the mixture of step (c) and optionally further isolating an purifying the phenoxy substituted aromatic substrate. Optionally, the removal of water during step (a) is in conjunction with partial removal of the organic solvent.
    Type: Grant
    Filed: December 16, 2007
    Date of Patent: June 25, 2013
    Assignee: Makhteshim Chemical Works, Ltd.
    Inventors: David Ovadia, Raya Sturkovich, David Leonov
  • Patent number: 7687622
    Abstract: Provided is a novel synthesis of quetiapine, and pharmaceutically acceptable salts thereof, in which an alkali metal halide or siliyl halide is included in the reaction mixture.
    Type: Grant
    Filed: April 14, 2006
    Date of Patent: March 30, 2010
    Assignee: Teva Pharmaceutical Industries, Ltd
    Inventors: Vinod Kumar Kansal, Kanhaiya Lal, Suhail Ahmad, David Leonov
  • Publication number: 20090281316
    Abstract: The present invention provides a process for reacting between a phenol derivative and an aromatic substrate under phenolate forming conditions comprising the following steps: (a) reacting a phenol derivative with a base in a polar organic solvent to obtain a phenolate salt, wherein water is removed form the reaction mixture during the reaction, (b) adding the aromatic substrate to the reaction mixture obtained in step (a), (c) heating the reaction mixture of step (b) to a temperature in the range of 80° to 1300° C., preferably, 90° to 1000° C. for 2 to 7 hours to obtain a phenoxy substituted aromatic substrate, (d) removing the solvent from the mixture of step (c) and optionally further isolating an purifying the phenoxy substituted aromatic substrate. Optionally, the removal of water during step (a) is in conjunction with partial removal of the organic solvent.
    Type: Application
    Filed: December 16, 2007
    Publication date: November 12, 2009
    Inventors: David Ovadia, Raya Sturkovich, David Leonov
  • Publication number: 20070037843
    Abstract: The present invention provides for novel polymorphs of zolpidem hemitartrate and the preparation of the polymorphs.
    Type: Application
    Filed: October 25, 2006
    Publication date: February 15, 2007
    Inventors: Judith Aronhime, David Leonov, Erzebet Meszaros-Sos, Szaboles Salyi, Csaba Szabo, Shlomo Zavurov
  • Publication number: 20060276641
    Abstract: Provided is a novel synthesis of quetiapine, and pharmaceutically acceptable salts thereof, in which an alkali metal halide or siliyl halide is included in the reaction mixture.
    Type: Application
    Filed: April 14, 2006
    Publication date: December 7, 2006
    Inventors: Vinod Kansal, Kanhaiya Lal, Suhail Ahmad, David Leonov
  • Publication number: 20040220211
    Abstract: The present invention provides for novel polymorphs of zolpidem hemitartrate and the preparation of the polymorphs.
    Type: Application
    Filed: May 24, 2004
    Publication date: November 4, 2004
    Inventors: Judith Aronhime, David Leonov, Erzebet Meszaros-Sos, Szaboles Salyi, Csaba Szabo, Shlomo Zavurov
  • Publication number: 20040220213
    Abstract: The present invention provides for novel polymorphs of zolpidem hemitartrate and the preparation of the polymorphs.
    Type: Application
    Filed: May 24, 2004
    Publication date: November 4, 2004
    Inventors: Judith Aronhime, David Leonov, Erzebet Meszaros-Sos, Szaboles Salyi, Csaba Szabo, Shlomo Zavurov
  • Publication number: 20040220210
    Abstract: The present invention provides for novel polymorphs of zolpidem hemitartrate and the preparation of the polymorphs.
    Type: Application
    Filed: May 24, 2004
    Publication date: November 4, 2004
    Inventors: Judith Aronhime, David Leonov, Erzebet Meszaros-Sos, Szaboles Salyi, Csaba Szabo, Shlomo Zavurov
  • Publication number: 20040220212
    Abstract: The present invention provides for novel polymorphs of zolpidem hemitartrate and the preparation of the polymorphs.
    Type: Application
    Filed: May 24, 2004
    Publication date: November 4, 2004
    Inventors: Judith Aronhime, David Leonov, Erzebet Meszaros-Sos, Szaboles Salyi, Csaba Szabo, Shlomo Zavurov
  • Publication number: 20040214859
    Abstract: The present invention provides for novel polymorphs of zolpidem hemitartrate and the preparation of the polymorphs.
    Type: Application
    Filed: May 24, 2004
    Publication date: October 28, 2004
    Inventors: Judith Aronhime, David Leonov, Erzebet Meszaros-Sos, Szaboles Salyi, Csaba Szabo, Shlomo Zavurov
  • Publication number: 20040214858
    Abstract: The present invention provides for novel polymorphs of zolpidem hemitartrate and the preparation of the polymorphs.
    Type: Application
    Filed: May 24, 2004
    Publication date: October 28, 2004
    Inventors: Judith Aronhime, David Leonov, Erzebet Meszaros-Sos, Szaboles Salyi, Csaba Szabo, Shlomo Zavurov
  • Patent number: 6686481
    Abstract: The present invention relates to a process to prepare semi synthetic statins, to intermediates formed during said process and to highly purified simvastatin produced by the process.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: February 3, 2004
    Assignee: Plus Chemicals, B.V.
    Inventors: Szabo Csaba, Ferenc Korodi, Melczer Istvan, Szabolcs Salyi, David Leonov
  • Patent number: 6465496
    Abstract: The present invention is directed to the novel forms of torsemide, designated Form V, amorphous torsemide, Dupont Form 2 solvent adduct, Dupont Form 2 ethanol adduct and Dupont Form 2 isopropanol adduct. Methods for their preparation are also disclosed. The present invention also relates to processes for making torsemide modification I. Pharmaceutical compositions containing the new forms of torsemide and methods of using them are also disclosed.
    Type: Grant
    Filed: August 11, 2000
    Date of Patent: October 15, 2002
    Assignee: Teva Pharmaceutical Industries, Ltd.
    Inventors: Judith Aronhime, David Leonov, Marko Kordova, Anchel Schwartz, Ben-Zion Dolitzky
  • Publication number: 20020120147
    Abstract: The present invention relates to torsemide having relatively small particles, and corresponding relatively large surface area. In one embodiment, the invention relates to torsemide and formulations containing torsemide having a mean particle diameter of less than 200 micrometers.
    Type: Application
    Filed: August 14, 2001
    Publication date: August 29, 2002
    Inventors: Marco Kordova, Anchel Schwartz, Ben-Zion Dolitzky, Judith Aronhime, David Leonov, Shlomo Zavurov
  • Publication number: 20020115712
    Abstract: The present invention relates to a process to prepare semi synthetic statins, to intermediates formed during said process and to highly purified simvastatin produced by the process.
    Type: Application
    Filed: July 26, 2001
    Publication date: August 22, 2002
    Inventors: Csaba Szabo, Ferenc Korodi, Melczer Istvan, Szabolcs Salyi, David Leonov
  • Publication number: 20020077332
    Abstract: The present invention provides for novel polymorphs of zolpidem hemitartrate and the preparation of the polymorphs.
    Type: Application
    Filed: April 24, 2001
    Publication date: June 20, 2002
    Inventors: Judith Aronhime, David Leonov, Erzebet Meszaros-Sos, Szaboles Salyi, Csaba Szabo, Shlomo Zavurov
  • Patent number: 6245921
    Abstract: A process for the isolation of the pseudomonic acid A antibiotic of pharmaceutical quality from the culture broth of one of the pseudomonic acid A-producing species of the Pseudomonas bacterium genus comprising the extraction of the biosynthesized pseudomonic acid A from the culture broth at acidic pH with a chlorinated aliphatic hydrocarbon or isobutyl acetate, followed by purification, is disclosed.
    Type: Grant
    Filed: February 3, 2000
    Date of Patent: June 12, 2001
    Assignee: Biogal Gyogyszergyar Rt.
    Inventors: Istvan Barta, Aniko Tegdes, Valeria Szell, Csaba Szabo, Edit Nagy Nee Arvai, Vilmos Keri, David Leonov, IIdiko Lang, Margit Bidlo Nee Igloy, Gyula Jerkovich, Janos Salat