Granted Patent
Utility
US 4,814,079 · App. 07/177,456
Spirally wrapped reverse osmosis membrane cell
Inventor:
Burnett M. Schneider
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Apr 4, 1988
Inventor
Burnett M. Schneider
Assignee (at issue)
Aqua-Chem, 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.