Granted Patent
Utility
US 5,527,913 · App. 08/200,398
Methods for purifying camptothecin compounds
Inventor:
Hellmuth R. Hinz
Patented Case
View Patent ↗
Granted: Jun 18, 1996
Filed: Feb 23, 1994
Inventor
Hellmuth R. Hinz
Assignee (at issue)
The Stehlin Foundation for Cancer Research
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.