Granted Patent
Utility
US 5,939,447 · App. 08/894,956
Substituted benzopyrans
Inventors:
Peter Gorycki, Blanche W. Annan, George Kuo
Patented Case
View Patent ↗
Granted: Aug 17, 1999
Filed: Mar 11, 1998
Inventors
Peter Gorycki
Blanche W. Annan
George Kuo
Assignee (at issue)
SmithKline Beecham Limited
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.