Granted Patent
Utility
US 4,925,848 · App. 07/187,648
Derivative of codeine useful as an agonist and process for the preparation of it
Inventors:
John Lewis, Colin F. Smith
Patented Case
View Patent ↗
Granted: May 15, 1990
Filed: Apr 28, 1988
Inventors
John Lewis
Colin F. Smith
Assignee (at issue)
Reckitt & Colman Products Limited
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.