Granted Patent
Utility
US 5,428,159 · App. 08/224,932
Method of manufacture of (-)-galanthamine in high yield and purity substantially free of epigalanthamine
Inventors:
Wen-Chung Shieh, John A. Carlson
Patented Case
View Patent ↗
Granted: Jun 27, 1995
Filed: Apr 8, 1994
Inventors
Wen-Chung Shieh
John A. Carlson
Assignee (at issue)
Ciba-Geigy
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.