Granted Patent
Utility
US 5,169,925 · App. 07/538,111
Polymeric polyalkyl-1-oxa-diazaspirodecanes
Inventors:
Georg Schmailzl, Gerhard Pfahler, Gunther Nowy
Patented Case
View Patent ↗
Granted: Dec 8, 1992
Filed: Jun 14, 1990
Inventors
Georg Schmailzl
Gerhard Pfahler
Gunther Nowy
Assignee (at issue)
Hoechst GmbH
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.