Granted Patent
Utility
US 4,985,196 · App. 07/114,949
Pipe liner process
Inventors:
Patrick R. Ledoux, Lue Fourgaut
Patented Case
View Patent ↗
Granted: Jan 15, 1991
Filed: Oct 30, 1987
Inventors
Patrick R. Ledoux
Lue Fourgaut
Assignee (at issue)
Pipe Liners, 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.