Granted Patent
Utility
US 6,818,129 · App. 10/017,077
Ion exchange removal of metal ions from wastewater
Inventors:
Philip Mason Kemp, James L. Filson, Stanley R. Kaars, Frank L. Sassaman
Patented Case
View Patent ↗
Granted: Nov 16, 2004
Filed: Dec 14, 2001
Inventors
Philip Mason Kemp
James L. Filson
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.