Granted Patent
Utility
US 5,201,152 · App. 07/922,881
Containment device for contaminated building demolition
Inventor:
David C. Heffner
Patented Case
View Patent ↗
Granted: Apr 13, 1993
Filed: Jul 31, 1992
Inventor
David C. Heffner
Assignee (at issue)
The Babcock & Wilcox Company
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.