Granted Patent
Utility
US 5,284,424 · App. 07/998,431
Osmotic water purification pumping system with flush valve
Inventors:
Fredrik Dellby, Per Fonser, Peter Hagqvist
Patented Case
View Patent ↗
Granted: Feb 8, 1994
Filed: Dec 30, 1992
Inventors
Fredrik Dellby
Per Fonser
Peter Hagqvist
Assignee (at issue)
Aktiebolaget Electrolux
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.