Granted Patent
Utility
US 5,617,892 · App. 08/509,207
Irrigation system shut-off valve
Inventor:
Peter J. Pappas
Patented Case
View Patent ↗
Granted: Apr 8, 1997
Filed: Jul 31, 1995
Inventor
Peter J. Pappas
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.