Granted Patent
Utility
US 4,431,819 · App. 06/144,769
3-(Pyrrolo and 3-indolyl)-3-diphenylamino substituted phthalides
Inventors:
Paul Schmidt, William M. Hung
Patented Case
View Patent ↗
Granted: Feb 14, 1984
Filed: Apr 28, 1980
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.