Granted Patent
Utility
US 6,494,434 · App. 09/904,426
Butterfly valve
Inventor:
Friedrich Geiser
Patented Case
View Patent ↗
Granted: Dec 17, 2002
Filed: Jul 12, 2001
Inventor
Friedrich Geiser
Assignee (at issue)
VAT Holding AG
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.