Granted Patent
Utility
US 4,935,426 · App. 07/307,525
N,N'-disubstituted piperazines
Inventors:
Matthias Zipplies, Hubert Sauter, Franz Roehl, Thomas Kuekenhoehner, Lothar Janitschke, Eberhard Ammermann, Gisela Lorenz
Patented Case
View Patent ↗
Granted: Jun 19, 1990
Filed: Feb 8, 1989
Inventors
Matthias Zipplies
Hubert Sauter
Franz Roehl
Thomas Kuekenhoehner
Lothar Janitschke
Eberhard Ammermann
Gisela Lorenz
Assignee (at issue)
BASF SE
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.