Granted Patent
Utility
US 5,990,187 · App. 08/870,189
Method of preparing polyurethane foam utilizing organofunctionally modified polysiloxanes
Inventors:
Tammo Boinowitz, Georg Burkhart, Rolf-Dieter Langenhagen, Ingo Schlachter, Andreas Weier
Patented Case
View Patent ↗
Granted: Nov 23, 1999
Filed: Jun 6, 1997
Inventors
Tammo Boinowitz
Georg Burkhart
Rolf-Dieter Langenhagen
Ingo Schlachter
Andreas Weier
Assignee (at issue)
Th. Goldschmidt. AG
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.