Granted Patent
Utility
US 5,667,672 · App. 08/628,824
Aquarium undergravel filter
Inventors:
Steven Convertino, Jonas Ivasauskas
Patented Case
View Patent ↗
Granted: Sep 16, 1997
Filed: Apr 5, 1996
Inventors
Steven Convertino
Jonas Ivasauskas
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.