Granted Patent
Utility
US 6,524,487 · App. 09/900,149
Methods and compositions using lanthanum for removing phosphate from water
Inventors:
Robert Kulperger, Richard Okun, Glenn Munford
Patented Case
View Patent ↗
Granted: Feb 25, 2003
Filed: Jul 9, 2001
Inventors
Robert Kulperger
Richard Okun
Glenn Munford
Assignee (at issue)
Natural Chemistry, 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.