Granted Patent
Utility
US 5,527,130 · App. 08/070,271
Environmentally safe underground piping system
Inventor:
Michael C. Webb
Patented Case
View Patent ↗
Granted: Jun 18, 1996
Filed: Jun 1, 1993
Inventor
Michael C. Webb
Assignee (at issue)
Environ Products, 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.