Granted Patent
Utility
US 5,211,379 · App. 07/813,292
Continuously self-compensating hydraulic positioner
Inventor:
Clyde R. Porter
Patented Case
View Patent ↗
Granted: May 18, 1993
Filed: Dec 18, 1991
Inventor
Clyde R. Porter
Assignee (at issue)
P. L. Porter Co.
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.