Patents by Inventor Alexander Sergeevitch Malin

Alexander Sergeevitch Malin 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