Granted Patent
Utility
US 6,227,797 · App. 09/281,608
Rotary pump with hydrodynamically suspended impeller
Inventors:
Peter Andrew Watterson, Geoffrey Douglas Tansley, John Woodard
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Mar 30, 1999
Inventors
Peter Andrew Watterson
Geoffrey Douglas Tansley
John Woodard
Assignee (at issue)
Ventrassist Pty Ltd. and University of Technology, Sydney
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.