Granted Patent
Utility
US 6,224,331 · App. 09/306,604
Centrifugal pump with solids cutting action
Inventors:
John Hayward, Carlos Cohen
Patented Case
View Patent ↗
Granted: May 1, 2001
Filed: May 6, 1999
Inventors
John Hayward
Carlos Cohen
Assignee (at issue)
Hayward Gordon Limited
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.