Granted Patent
Utility
US 6,190,121 · App. 09/250,069
Centrifugal pump with solids cutting action
Inventors:
John Hayward, Carlos Cohen
Patented Case
View Patent ↗
Granted: Feb 20, 2001
Filed: Feb 12, 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.