Granted Patent
Utility
US 5,944,051 · App. 08/937,618
Sprinkler drain and test valve
Inventor:
Augustus W. Johnson
Patented Case
View Patent ↗
Granted: Aug 31, 1999
Filed: Sep 25, 1997
Inventor
Augustus W. Johnson
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.