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:
Apr. 17, 2007
Filed:
Mar. 28, 2006
Torsten Hagen, Essen, DE;
Stefan Grabowski, Dormagen, DE;
Richard Adamson, Leichlingen, DE;
Daniel Koch, Duisburg, DE;
Stefan Wershofen, Mönchengladbach, DE;
Torsten Hagen, Essen, DE;
Stefan Grabowski, Dormagen, DE;
Richard Adamson, Leichlingen, DE;
Daniel Koch, Duisburg, DE;
Stefan Wershofen, Mönchengladbach, DE;
Bayer Materialscience AG, Leverkusen, DE;
Abstract
Di- and polyamines of the diphenylmethane series are prepared by a) mixing a first portion of aniline with an acid catalyst, b) mixing a second portion of aniline with formaldehyde, and c) mixing and reacting the mixtures prepared in each of steps a) and b). The diamines produced by this process may then be phosgenated to produce the corresponding di-/polyisocyanate.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile