Granted Patent
Utility
US 5,794,941 · App. 08/456,360
Piston ring assembly
Inventor:
John C. Lahrman
Patented Case
View Patent ↗
Granted: Aug 18, 1998
Filed: Jun 1, 1995
Inventor
John C. Lahrman
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.