Granted Patent
Utility
US 5,445,494 · App. 08/148,951
Multi-stage centrifugal pump with canned magnetic bearing
Inventor:
Lloyd D. Hanson
Patented Case
View Patent ↗
Granted: Aug 29, 1995
Filed: Nov 8, 1993
Inventor
Lloyd D. Hanson
Assignee (at issue)
BW/IP International, 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.