Granted Patent
Utility
US 5,238,255 · App. 07/833,771
Oil ring assembly
Inventor:
Steven J. Sytsma
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Feb 11, 1992
Inventor
Steven J. Sytsma
Assignee (at issue)
Sealed Power Technologies Limited Partnership
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.