Granted Patent
Utility
US 6,783,339 · App. 10/331,898
Hydraulic motor with a separate spool valve
Inventors:
Xingen Dong, Brad P. Shupe
Patented Case
View Patent ↗
Granted: Aug 31, 2004
Filed: Dec 30, 2002
Inventors
Xingen Dong
Brad P. Shupe
Assignee (at issue)
Parker-Hannifin 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.