Granted Patent
Utility
US 5,003,079 · App. 07/441,160
Process for the preparation of benzimidazolones
Inventors:
Michael Meier, Gunther Semler
Patented Case
View Patent ↗
Granted: Mar 26, 1991
Filed: Nov 24, 1989
Inventors
Michael Meier
Gunther Semler
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.