Patents by Inventor Vera Yakovlevna Popkova

Vera Yakovlevna Popkova 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 production of 1,5-dinitronaphthalene
    Patent number: 6992230
    Abstract: The invention is directed to a process for the production of 1,5-dinitronaphthalene wherein naphthalene is nitrated by nitric acid in the absence of sulfuric acid at temperatures of from 30 to 80° C., wherein the nitric acid has a concentration of from 72 to 87 wt.-%, the reaction mixture obtained is filtered at temperatures of from 5 to 20° C. and the solid precipitate obtained is washed with water, and 1,5-dinitronaphthalene is isolated from the washed precipitate by washing with acetone.
    Type: Grant
    Filed: November 2, 2004
    Date of Patent: January 31, 2006
    Assignee: Bayer MaterialScience AG
    Inventors: Hans-Peter Schal, Vera Yakovlevna Popkova, Boris Mikhaylovitch Laskin, Alexander Sergeevitch Malin, Sofia Borisovna Volkova
  • Process for preparing perfluoroalkyl aryl sulfides and novel perfluoroalkyl aryl sulfides
    Patent number: 6175042
    Abstract: This invention relates to a process for preparing perfluoroalkyl aryl sulfides by reaction of disulfides with alkali metal salts of aliphatic perfluorocarboxylic acids in the presence of a high-boiling aprotic solvent at elevated temperature and reduced pressure, wherein the product formed is distilled off at the rate at which it is formed. This invention further relates to the novel compounds 2-nitrophenyl pentafluoroethyl sulfide and 2-aminophenyl pentafluoroethyl sulfide.
    Type: Grant
    Filed: May 28, 1999
    Date of Patent: January 16, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Vera Yakovlevna Popkova, Albrecht Marhold
  • Process for the preparation of 2,2,3,3-tetrafluoro-1,4-benzodioxanes, novel o-(2-bromo-1,1,2,2-tetrafluoroethoxy)-phenols, and novel 2-bromo-1,1,2,2-tetrafluoroethoxy-containing phenyl ethers
    Patent number: 5936102
    Abstract: The present invention is drawn to a process for preparing a 2,2,3,3-tetrafluoro-1,4-benzodioxane, by cyclocondensing a o-(2-bromo-tetrafluoroethoxy)-phenol in the presence of an acid binder.
    Type: Grant
    Filed: July 23, 1998
    Date of Patent: August 10, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Vera Yakovlevna Popkova, Albrecht Marhold