Granted Patent
Utility
US 5,731,316 · App. 08/594,235
Derivatives of camptothecin and methods of treating cancer using these derivatives
Inventors:
Zhisong Cao, Beppino C. Giovanella
Patented Case
View Patent ↗
Granted: Mar 24, 1998
Filed: Jan 30, 1996
Inventors
Zhisong Cao
Beppino C. Giovanella
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.