Granted Patent
Utility
US 5,117,741 · App. 07/465,909
Double wall hydraulic cylinder
Inventor:
Paul D. Richards
Patented Case
View Patent ↗
Granted: Jun 2, 1992
Filed: Jan 16, 1990
Inventor
Paul D. Richards
Assignee (at issue)
Sta-Rite 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.