Granted Patent
Utility
US 6,708,728 · App. 09/907,121
Installation of cured in place liners with air and steam and installation apparatus
Inventors:
Franklin Driver, Weiping Wang
Patented Case
View Patent ↗
Granted: Mar 23, 2004
Filed: Jul 17, 2001
Inventors
Franklin Driver
Weiping Wang
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.