Granted Patent
Utility
US 6,821,311 · App. 10/030,263
Method for treating fertilizer process solutions
Inventors:
Janne Karonen, Anders Weckman
Patented Case
View Patent ↗
Granted: Nov 23, 2004
Filed: Apr 8, 2002
Inventors
Janne Karonen
Anders Weckman
Assignee (at issue)
Kemira Growhow Oyj
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.