Granted Patent
Utility
US 5,921,748 · App. 08/894,817
Centrifugal pump
Inventor:
John Semple Frater
Patented Case
View Patent ↗
Granted: Jul 13, 1999
Filed: Nov 26, 1997
Inventor
John Semple Frater
Assignee (at issue)
Sykes Pumps Australia Pty Ltd
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.