Granted Patent
Utility
US 6,803,483 · App. 10/457,105
Process for the purification of mixtures of toluenediisocyanate
Inventors:
Heinrich Lokum, Ove Nommensen, Hermann Dallmeyer, Wilhelm Hagen
Patented Case
View Patent ↗
Granted: Oct 12, 2004
Filed: Jun 9, 2003
Inventors
Heinrich Lokum
Ove Nommensen
Hermann Dallmeyer
Wilhelm Hagen
Assignee (at issue)
Bayer Aktiengesellschaft
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.