Granted Patent
Utility
US 5,397,463 · App. 08/136,116
Aerobic aquarium filter chamber
Inventor:
Klaus Woltmann
Patented Case
View Patent ↗
Granted: Mar 14, 1995
Filed: Oct 13, 1993
Inventor
Klaus Woltmann
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.