Granted Patent
Utility
US 5,427,474 · App. 08/008,752
Double containment piping system and centralization seal therefor
Inventor:
Terrel W. Silvers
Patented Case
View Patent ↗
Granted: Jun 27, 1995
Filed: Jan 25, 1993
Inventor
Terrel W. Silvers
Assignee (at issue)
Ameron, 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.