Granted Patent
Utility
US 5,344,285 · App. 08/131,345
Centrifugal pump with monolithic diffuser and return vane channel ring member
Inventors:
Mark O'Sullivan, Timothy L. Wotring
Patented Case
View Patent ↗
Granted: Sep 6, 1994
Filed: Oct 4, 1993
Inventors
Mark O'Sullivan
Timothy L. Wotring
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.