Granted Patent
Utility
US 5,250,688 · App. 07/825,440
Purine derivatives
Inventors:
Michael R. Harnden, Richard Jarvest
Patented Case
View Patent ↗
Granted: Oct 5, 1993
Filed: Jan 22, 1992
Inventors
Michael R. Harnden
Richard Jarvest
Assignee (at issue)
Beecham Group plc
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.