Granted Patent
Utility
US 5,256,261 · App. 07/933,108
Membrane cell operation
Inventors:
Marek Lipsztajn, John Rizzi
Patented Case
View Patent ↗
Granted: Oct 26, 1993
Filed: Aug 21, 1992
Inventors
Marek Lipsztajn
John Rizzi
Assignee (at issue)
Sterling Canada, Inc.
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.