Granted Patent
Utility
US 5,870,818 · App. 08/888,423
Method for manufacturing a pole piece for electromagnetic friction clutch
Inventor:
Joseph J. Bisaga
Patented Case
View Patent ↗
Granted: Feb 16, 1999
Filed: Jul 7, 1997
Inventor
Joseph J. Bisaga
Assignee (at issue)
DANA 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.