Granted Patent
Utility
US 5,176,171 · App. 07/780,096
Check valve
Inventor:
Bo Andersson
Patented Case
View Patent ↗
Granted: Jan 5, 1993
Filed: Oct 17, 1991
Inventor
Bo Andersson
Assignee (at issue)
FLOMATIC CORPORATION
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.