Granted Patent
Utility
US 4,595,768 · App. 06/602,991
3-(substituted phenyl)phthalides
Inventors:
Paul Schmidt, Nathan N. Crounse
Patented Case
View Patent ↗
Granted: Jun 17, 1986
Filed: Apr 23, 1984
Inventors
Paul Schmidt
Nathan N. Crounse
Assignee (at issue)
Hilton Davis Chemical Co.
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.