Granted Patent
Utility
US 5,552,091 · App. 08/497,516
Benzopyran compounds
Inventor:
Anil Kumar
Patented Case
View Patent ↗
Granted: Sep 3, 1996
Filed: Jun 30, 1995
Inventor
Anil Kumar
Assignee (at issue)
PPG Industries, 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.