Granted Patent
Utility
US 4,944,653 · App. 07/172,577
Plastic centrifugal pump
Inventor:
Robert D. Wilkes
Patented Case
View Patent ↗
Granted: Jul 31, 1990
Filed: Mar 24, 1988
Inventor
Robert D. Wilkes
Assignee (at issue)
Jacuzzi 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.