Granted Patent
Utility
US 4,307,018 · App. 06/130,471
Heteroarylphthalides
Inventors:
Nathan N. Crounse, Paul Schmidt
Patented Case
View Patent ↗
Granted: Dec 22, 1981
Filed: Mar 14, 1980
Inventors
Nathan N. Crounse
Paul Schmidt
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.