Granted Patent
Utility
US 4,818,840 · App. 07/133,145
Method of making an electromagnetic coupling disc
Inventors:
Dwight E. Booth, Gerry Lippincott
Patented Case
View Patent ↗
Granted: Apr 4, 1989
Filed: Dec 14, 1987
Inventors
Dwight E. Booth
Gerry Lippincott
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.