Granted Patent
Utility
US 5,906,733 · App. 08/875,613
Liquid cleaning system including back-flushing filter and centrifugal cleaner therefor
Inventor:
Ronald J. Purvey
Patented Case
View Patent ↗
Granted: May 25, 1999
Filed: Jul 31, 1997
Inventor
Ronald J. Purvey
Assignee (at issue)
The Glacier Metal Company 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.