Granted Patent
Utility
US 6,476,225 · App. 10/051,707
Process for purifying 20(S)-camptothecin
Inventors:
Rainer Sobotta, Armin Rapp
Patented Case
View Patent ↗
Granted: Nov 5, 2002
Filed: Jan 17, 2002
Inventors
Rainer Sobotta
Armin Rapp
Assignee (at issue)
BOEHRINGER INGELHEIM PHARMA GMBH & CO. KG
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.