Granted Patent
Utility
US 5,571,397 · App. 08/498,446
Boron nitride exhaust seal
Inventor:
David Charles Weber
Patented Case
View Patent ↗
Granted: Nov 5, 1996
Filed: Jul 5, 1995
Inventor
David Charles Weber
Assignee (at issue)
Ford Motor Company
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.