Granted Patent
Utility
US 4,994,472 · App. 07/388,413
1-(pyridinylamino)-2-pyrrolidinones as pain relievers
Inventors:
Richard C. Effland, David G. Wettlaufer
Patented Case
View Patent ↗
Granted: Feb 19, 1991
Filed: Aug 2, 1989
Inventors
Richard C. Effland
David G. Wettlaufer
Assignee (at issue)
Hoechst Roussel Pharmaceuticals
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.