Granted Patent
Utility
US 5,648,484 · App. 08/451,111
Catalytic enantioselective synthesis of a spriofused azetidinone
Inventor:
Guang-Zhong Wu
Patented Case
View Patent ↗
Granted: Jul 15, 1997
Filed: May 25, 1995
Inventor
Guang-Zhong Wu
Assignee (at issue)
SCHERING CORPORATION
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.