Granted Patent
Utility
US 5,679,253 · App. 08/382,371
Rotating biological aquarium filter system
Inventors:
Charles O. Fuerst, Roy S. Hickok
Patented Case
View Patent ↗
Granted: Oct 21, 1997
Filed: Feb 1, 1995
Inventors
Charles O. Fuerst
Roy S. Hickok
Assignee (at issue)
Aquaria, 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.