The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 31, 2006
Filed:
Nov. 02, 2004
Hans-peter Schal, Dormagen, DE;
Vera Yakovlevna Popkova, Moskau, RU;
Boris Mikhaylovitch Laskin, St. Petersburg, RU;
Alexander Sergeevitch Malin, St. Petersburg, RU;
Sofia Borisovna Volkova, St. Petersburg, RU;
Hans-Peter Schal, Dormagen, DE;
Vera Yakovlevna Popkova, Moskau, RU;
Boris Mikhaylovitch Laskin, St. Petersburg, RU;
Alexander Sergeevitch Malin, St. Petersburg, RU;
Sofia Borisovna Volkova, St. Petersburg, RU;
Bayer MaterialScience AG, Leverkusen, DE;
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.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile