Granted Patent
Utility
US 5,871,332 · App. 08/454,777
Centrifugal pump
Inventors:
Ian Gray, John Culler, Ronald Palgrave
Patented Case
View Patent ↗
Granted: Feb 16, 1999
Filed: May 31, 1995
Inventors
Ian Gray
John Culler
Ronald Palgrave
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.