Granted Patent
Utility
US 5,320,489 · App. 08/069,813
Diffuser for a centrifugal pump
Inventor:
John M. McKenna
Patented Case
View Patent ↗
Granted: Jun 14, 1994
Filed: Jun 1, 1993
Inventor
John M. McKenna
Assignee (at issue)
Ingersoll-Dresser Pump Company
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.