Granted Patent
Utility
US 4,473,972 · App. 06/397,357
Blade for centrifugal blasting wheels
Inventor:
Raymond M. Leliaert
Patented Case
View Patent ↗
Granted: Oct 2, 1984
Filed: Jul 12, 1982
Inventor
Raymond M. Leliaert
Assignee (at issue)
Wheelabrator-Frye 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.