Granted Patent
Utility
US 6,250,332 · App. 09/402,194
Diaphragm valve
Inventor:
Ingvar Backlund
Patented Case
View Patent ↗
Granted: Jun 26, 2001
Filed: Oct 1, 1999
Inventor
Ingvar Backlund
Assignee (at issue)
Robovalve AB
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.