Granted Patent
Utility
US 5,175,288 · App. 07/506,587
Process for preparing purine derivatives and intermediates thereof
Inventors:
Trevor John Grinter, Graham Richard Geen, Martin Parratt
Patented Case
View Patent ↗
Granted: Dec 29, 1992
Filed: Apr 9, 1990
Inventors
Trevor John Grinter
Graham Richard Geen
Martin Parratt
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.