Granted Patent
Utility
US 6,131,441 · App. 09/159,226
Apparatus and method for isolating or testing a pipe segment
Inventors:
Guy Berube, Glenn Carson
Patented Case
View Patent ↗
Granted: Oct 17, 2000
Filed: Sep 23, 1998
Inventors
Guy Berube
Glenn Carson
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.