IP Library Granted Patent US 5,861,401
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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 5,861,401
App. No.
08/716,194
Filed
1996-09-30
Granted
1999-01-19
Kind
A