Granted Patent
Utility
US 6,355,801 · App. 09/707,018
Process for preparing N-(4-hydroxyphenyl)-N′-(4′-aminophenyl)-piperazine
Inventors:
Brigitte Giesinger, Ingrid Mergelsberg
Patented Case
View Patent ↗
Granted: Mar 12, 2002
Filed: Nov 6, 2000
Inventors
Brigitte Giesinger
Ingrid Mergelsberg
Assignee (at issue)
SCHERING CORPORATION
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.