Granted Patent
Utility
US 5,115,936 · App. 07/644,511
Double wall underground storage tank
Inventor:
David H. Bartlow
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: Jan 23, 1991
Inventor
David H. Bartlow
Assignee (at issue)
Owens-Corning Fiberglas Corp.
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.