Granted Patent
Utility
US 6,477,982 · App. 09/142,358
Substances and method for the production of water suitable for aquariums or garden ponds
Inventor:
Gunter Ritter
Patented Case
View Patent ↗
Granted: Nov 12, 2002
Filed: May 24, 1999
Inventor
Gunter Ritter
Assignee (at issue)
WARNER-LAMBERT COMPANY LLC
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.