Granted Patent
Utility
US 5,116,509 · App. 07/404,728
Electrodeionization and ultraviolet light treatment method for purifying water
Inventor:
Janet C. White
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: Sep 8, 1989
Inventor
Janet C. White
Assignee (at issue)
Millipore Corporation
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.