Granted Patent
Utility
US 5,423,978 · App. 08/004,678
Rotating biologic aquarium filter system
Inventors:
Wilfred Philip Snyder, Charles O. Fuerst, Joseph Scott Bussing
Patented Case
View Patent ↗
Granted: Jun 13, 1995
Filed: Jan 14, 1993
Inventors
Wilfred Philip Snyder
Charles O. Fuerst
Joseph Scott Bussing
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.