Granted Patent
Utility
US 6,276,396 · App. 09/449,926
Directional control valves
Inventor:
Douglas F Kirkman
Patented Case
View Patent ↗
Granted: Aug 21, 2001
Filed: Dec 2, 1999
Inventor
Douglas F Kirkman
Assignee (at issue)
Mandeville Engineering Limited
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.