Granted Patent
Utility
US 5,686,631 · App. 08/678,211
Asymmetric synthesis of R and S warfarin and its analogs
Inventors:
Hui Li, Andrea Robinson
Patented Case
View Patent ↗
Granted: Nov 11, 1997
Filed: Jul 11, 1996
Inventors
Hui Li
Andrea Robinson
Assignee (at issue)
The DuPont Merck Pharmaceutical Company
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.