Granted Patent
Utility
US 6,334,458 · App. 09/461,380
By-pass valve in particular for pressure-washing machines
Inventor:
Roberto Amaduzzi
Patented Case
View Patent ↗
Granted: Jan 1, 2002
Filed: Dec 15, 1999
Inventor
Roberto Amaduzzi
Assignee (at issue)
ARROW LINE S.R.L.
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.