Granted Patent
Utility
US 5,213,025 · App. 07/783,407
Conical rod piston
Inventor:
Roy J. Rozek
Patented Case
View Patent ↗
Granted: May 25, 1993
Filed: Oct 28, 1991
Inventor
Roy J. Rozek
Assignee (at issue)
THOMAS INDUSTRIES, INC.
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.