Granted Patent
Utility
US 4,255,577 · App. 06/069,979
Process and intermediates for preparing 3-[4-(disubstituted-amino)phenyl] o r
Inventors:
Paul Schmidt, William M. Hung
Patented Case
View Patent ↗
Granted: Mar 10, 1981
Filed: Aug 27, 1979
Inventors
Paul Schmidt
William M. Hung
Assignee (at issue)
Sterling Drug, 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.