Granted Patent
Utility
US 6,670,406 · App. 10/077,855
Process for producing polyether polyols
Inventors:
Jörg Hofmann, Stephan Ehlers, Bernd Klinksiek, Bert Klesczewski, Christian Steinlein, Lars Obendorf, Harald Pielartzik, Jose F. Pazos
Patented Case
View Patent ↗
Granted: Dec 30, 2003
Filed: Feb 19, 2002
Inventors
Jörg Hofmann
Stephan Ehlers
Bernd Klinksiek
Bert Klesczewski
Christian Steinlein
Lars Obendorf
Harald Pielartzik
Jose F. Pazos
Assignees (at issue)
Bayer Aktiengesellschaft
Bayer Polymers LLC
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.