Granted Patent
Utility
US 6,123,110 · App. 09/390,606
Dual containment pipe system and a manhole system
Inventors:
Stainton Casey Smith, Randall J. Mach
Patented Case
View Patent ↗
Granted: Sep 26, 2000
Filed: Sep 3, 1999
Inventors
Stainton Casey Smith
Randall J. Mach
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.