Granted Patent
Utility
US 4,891,077 · App. 07/263,371
Method of making an electromagnetic coupling disc
Inventors:
Thomas P. Roll, Dwight E. Booth
Patented Case
View Patent ↗
Granted: Jan 2, 1990
Filed: Oct 27, 1988
Inventors
Thomas P. Roll
Dwight E. Booth
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.