Granted Patent
Utility
US 6,830,680 · App. 10/311,067
Filtering method for swimming pools with water flow rate multiplying unit
Inventor:
Joel Queirel
Patented Case
View Patent ↗
Granted: Dec 14, 2004
Filed: Dec 13, 2002
Inventor
Joel Queirel
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.