Granted Patent
Utility
US 5,736,166 · App. 08/661,832
Flow-through apparatus for lining of pipelines
Inventor:
Richard C. Polivka
Patented Case
View Patent ↗
Granted: Apr 7, 1998
Filed: Jun 11, 1996
Inventor
Richard C. Polivka
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.