Granted Patent
Utility
US 6,827,526 · App. 10/146,244
Method and device for lining a sewer pipe
Inventor:
Darcy Warren
Patented Case
View Patent ↗
Granted: Dec 7, 2004
Filed: May 15, 2002
Inventor
Darcy Warren
Assignee (at issue)
Liqui-Force Sewer Services Inc.
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.