Granted Patent
Utility
US 5,169,907 · App. 07/614,787
Polyether/polycarbonate block copolymers and a process for their production
Inventors:
Robert J. Kumpf, Dittmar Nerger, Rolf Wehrmann, Harald Pielartzik
Patented Case
View Patent ↗
Granted: Dec 8, 1992
Filed: Nov 14, 1990
Inventors
Robert J. Kumpf
Dittmar Nerger
Rolf Wehrmann
Harald Pielartzik
Assignee (at issue)
Miles Inc.
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.