Granted Patent
Utility
US 4,251,241 · App. 06/054,845
Cyclone-type aspirated separator for washing dirt-laden dry airstreams
Inventor:
Eugene L. Bothun
Patented Case
View Patent ↗
Granted: Feb 17, 1981
Filed: Jul 5, 1979
Inventor
Eugene L. Bothun
Assignee (at issue)
Windsor Industries, 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.