Granted Patent
Utility
US 5,971,025 · App. 09/068,585
Diaphragm valve
Inventor:
Ingvar Backlund
Patented Case
View Patent ↗
Granted: Oct 26, 1999
Filed: May 6, 1998
Inventor
Ingvar Backlund
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.