Granted Patent
Utility
US 6,218,541 · App. 09/340,830
Method for extracting bisbenzylisoquinolines
Inventor:
Zhishuang Wang
Patented Case
View Patent ↗
Granted: Apr 17, 2001
Filed: Jun 28, 1999
Inventor
Zhishuang Wang
Assignee (at issue)
CBA, International, Inc.
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.