Granted Patent
Utility
US 5,971,029 · App. 08/500,645
Dual containment pipe system and method of installation
Inventors:
Stainton Casey Smith, Randall J. Mach
Patented Case
View Patent ↗
Granted: Oct 26, 1999
Filed: Jul 11, 1995
Inventors
Stainton Casey Smith
Randall J. Mach
Assignee (at issue)
Instituform (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.