Granted Patent
Utility
US 6,562,480 · App. 09/757,891
Wear resistant coating for piston rings
Inventors:
Thomas Stong, Peter Einberger, Thomas J. Smith
Patented Case
View Patent ↗
Granted: May 13, 2003
Filed: Jan 10, 2001
Inventors
Thomas Stong
Peter Einberger
Thomas J. Smith
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.