Granted Patent
Utility
US 5,618,889 · App. 07/701,425
Poly(arylether)/liquid crystalline polyester block copolymers and a process for their production
Inventors:
Robert J. Kumpf, Douglas A. Wicks, Dittmar Nerger, Harald Pielartzik, Rolf Wehrmann
Patented Case
View Patent ↗
Granted: Apr 8, 1997
Filed: May 15, 1991
Inventors
Robert J. Kumpf
Douglas A. Wicks
Dittmar Nerger
Harald Pielartzik
Rolf Wehrmann
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.