Granted Patent
Utility
US 5,722,666 · App. 08/654,129
Pipe coupler gasket with triangular sealing ridges
Inventor:
David E. Sisk
Patented Case
View Patent ↗
Granted: Mar 3, 1998
Filed: May 28, 1996
Inventor
David E. Sisk
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.