Granted Patent
Utility
US 5,861,401 · App. 08/716,194
N-heterocyclyl sulphonamide derivatives and their use as endothelin antagonists
Inventor:
Robert Hugh Bradbury
Patented Case
View Patent ↗
Granted: Jan 19, 1999
Filed: Sep 30, 1996
Inventor
Robert Hugh Bradbury
Assignee (at issue)
Zeneca 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.