Granted Patent
Utility
US 4,282,215 · App. 06/170,931
Analgesic mixture of nalbuphine and acetylsalicylic acid, derivative or salt thereof
Inventors:
John R. Dudzinski, William K. Schmidt
Patented Case
View Patent ↗
Granted: Aug 4, 1981
Filed: Jul 28, 1980
Inventors
John R. Dudzinski
William K. Schmidt
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.