US 2,005,051,478 · Filed 2003-09-10

The Two-Chamber Filter That Keeps Your Pitcher Water Clean

This invention is a replacement filter cartridge for water pitchers that works by splitting liquid into two separate zones: clean water flows through the filter into an inner chamber, while the dirty stuff gets trapped in an outer chamber below. It's the engineering that lets those filtered pitcher refills actually do something.

Curated and verified by the IsItPatented Editorial team

The plain-English version

What it protects

The claim covers a filter cartridge with a specific two-chamber design: a cup-shaped filter element sitting inside a larger container, creating an inner chamber (where filtered water collects) and an outer chamber (where contaminants settle). What's protected here is the arrangement where the filter's rim seals to the container's side wall, and vertical channels on the filter's exterior guide water downward into the lower chamber. Anyone making a competing cartridge with this same cup-in-cup structure and channeled flow path would potentially infringe.

Why it matters

This patent matters because it describes the core mechanism that makes pitcher filters work reliably in household water filtration. The two-chamber design separates clean and dirty water effectively, which is essential for consumer products like Brita or similar refillable pitchers. By patenting the specific geometry and channel arrangement, the inventors protected a practical solution to a problem millions of households face daily—how to remove chlorine, sediment, and odor from tap water without buying bottled water constantly.

Real-world use

Every time you pour tap water into a filtered pitcher like Brita and wait for it to drip through the cartridge, you're relying on this two-chamber design to catch impurities below while the clean water pools on top.

Original USPTO abstract

A beverage filter cartridge has an impermeable cup-shaped out container internally subdivided by a generally cup-shaped filter element into a first chamber inside the filter and a second chamber located between the filter bottom and the container bottom. The upper rim of the filter is joined at a peripheral juncture to the container side wall, and the filter side wall has exterior channels that face the container side wall and lead downwardly from the peripheral juncture to the second chamber.

Patent details

Publication number: US 2,005,051,478
Filing date: 2003-09-10
Grant date: Application — not yet granted
Assignee: Basil Karanikos / Fredrick Rossi
Inventor(s): KARANIKOS BASIL, ROSSI FREDRICK
CPC class: B65D85/8061

View original record on Google Patents →

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