Granted Patent
Utility
US 6,056,006 · App. 09/223,099
Piston pressure regulator
Inventor:
Phillip J. Hagerty
Patented Case
View Patent ↗
Granted: May 2, 2000
Filed: Dec 30, 1998
Inventor
Phillip J. Hagerty
Assignee (at issue)
Marshall Excelsior 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.