Granted Patent
Utility
US 5,693,389 · App. 08/553,412
Polyester composition
Inventor:
John Jamieson Liggat
Patented Case
View Patent ↗
Granted: Dec 2, 1997
Filed: Apr 17, 1996
Inventor
John Jamieson Liggat
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.