Granted Patent
Utility
US 5,939,563 · App. 09/052,048
O-methyloximes of benzopyran-3,4- and benzofuran-2,3-diones and methods for their preparation
Inventor:
Ian Richard Matthews
Patented Case
View Patent ↗
Granted: Aug 17, 1999
Filed: Mar 30, 1998
Inventor
Ian Richard Matthews
Assignee (at issue)
Zeneca 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.