Granted Patent
Utility
US 5,224,621 · App. 07/925,343
Double wall underground storage tank
Inventors:
Edward B. Cannan, Jr., Joseph R. Wiegand, David H. Bartlow
Patented Case
View Patent ↗
Granted: Jul 6, 1993
Filed: Aug 4, 1992
Inventors
Edward B. Cannan, Jr.
Joseph R. Wiegand
David H. Bartlow
Assignee (at issue)
Owens-Corning Fiberglas Technology, 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.