Granted Patent
Utility
US 5,885,141 · App. 08/900,900
Portable blast wheel cleaning machine
Inventor:
Robert B. Watkin
Patented Case
View Patent ↗
Granted: Mar 23, 1999
Filed: Jul 25, 1997
Inventor
Robert B. Watkin
Assignee (at issue)
United States Filter Corporation
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.