Granted Patent
Utility
US 6,346,195 · App. 09/113,982
Ion exchange removal of metal ions from wastewater
Inventors:
James L. Filson, Philip Mason Kemp, Stanley R. Kaars, Frank L. Sassaman
Patented Case
View Patent ↗
Granted: Feb 12, 2002
Filed: Jul 10, 1998
Inventors
James L. Filson
Philip Mason Kemp
Stanley R. Kaars
Frank L. Sassaman
Assignee (at issue)
USFilter 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.