Granted Patent
Utility
US 5,457,224 · App. 08/244,681
Resolution of racemic verapamil
Inventors:
Oskar Ehrmann, Herbert Nagel
Patented Case
View Patent ↗
Granted: Oct 10, 1995
Filed: Jun 7, 1994
Inventors
Oskar Ehrmann
Herbert Nagel
Assignee (at issue)
Knoll, 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.