Granted Patent
Utility
US 6,315,906 · App. 09/113,981
Removing metal ions from wastewater
Inventors:
Frank L. Sassaman, James L. Filson, Philip Mason Kemp
Patented Case
View Patent ↗
Granted: Nov 13, 2001
Filed: Jul 10, 1998
Inventors
Frank L. Sassaman
James L. Filson
Philip Mason Kemp
Assignee (at issue)
United States Filter 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.