Granted Patent
Utility
US 4,551,552 · App. 06/613,374
Process for preparing rimantadine
Inventor:
John Liu
Patented Case
View Patent ↗
Granted: Nov 5, 1985
Filed: May 23, 1984
Inventor
John Liu
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.