Granted Patent
Utility
US 4,250,315 · App. 06/086,253
Light-screening benzoxazole derivatives
Inventor:
Bruno Poncioni
Patented Case
View Patent ↗
Granted: Feb 10, 1981
Filed: Oct 18, 1979
Inventor
Bruno Poncioni
Assignee (at issue)
HOFFMANN-LA ROCHE 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.