Granted Patent
Utility
US 6,557,536 · App. 09/863,853
Safety shut-off valve for crankcase emission control system
Inventor:
Stephen Burgess
Patented Case
View Patent ↗
Granted: May 6, 2003
Filed: May 23, 2001
Inventor
Stephen Burgess
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.