Granted Patent
Utility
US 5,017,701 · App. 07/383,859
Process for the preparation of purine derivatives
Inventors:
Trevor John Grinter, Peter M. Kincey
Patented Case
View Patent ↗
Granted: May 21, 1991
Filed: Jul 21, 1989
Inventors
Trevor John Grinter
Peter M. Kincey
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.