Granted Patent
Utility
US 6,629,682 · App. 09/759,025
Vacuum valve
Inventor:
Bernhard Duelli
Patented Case
View Patent ↗
Granted: Oct 7, 2003
Filed: Jan 11, 2001
Inventor
Bernhard Duelli
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.