Granted Patent
Utility
US 4,621,568 · App. 06/676,795
Rotary hydraulic cylinder
Inventor:
Edward D. Gailey
Patented Case
View Patent ↗
Granted: Nov 11, 1986
Filed: Nov 30, 1984
Inventor
Edward D. Gailey
Assignee (at issue)
The S-P Manufacturing Corporation
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.