Granted Patent
Utility
US 5,338,003 · App. 07/889,792
Dual seal ball valve
Inventor:
John Beson
Patented Case
View Patent ↗
Granted: Aug 16, 1994
Filed: May 28, 1992
Inventor
John Beson
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.