Granted Patent
Utility
US 4,399,291 · App. 06/328,918
Process for the production of substituted aminophthalides
Inventors:
Paul Schmidt, Patrick J. Jefferies
Patented Case
View Patent ↗
Granted: Aug 16, 1983
Filed: Dec 9, 1981
Inventors
Paul Schmidt
Patrick J. Jefferies
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.