Granted Patent
Utility
US 5,285,601 · App. 08/048,925
Magnetic track self-propelled blast cleaning machine
Inventors:
Robert B. Watkin, David A. Hanson
Patented Case
View Patent ↗
Granted: Feb 15, 1994
Filed: Apr 16, 1993
Inventors
Robert B. Watkin
David A. Hanson
Assignee (at issue)
Wheelabrator Group Limited
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.