Granted Patent
Utility
US 6,520,719 · App. 09/513,957
Apparatus for installing a flexible cured in place lateral seal in an existing main pipeline
Inventors:
John Tweedie, Kerry D. Severs
Patented Case
View Patent ↗
Granted: Feb 18, 2003
Filed: Feb 28, 2000
Inventors
John Tweedie
Kerry D. Severs
Assignee (at issue)
Insituform (Netherlands) B.V.
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.