Cold Brew System with Double-Layer Filter Bag to Reduce Mess and Leaks

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Solution Overview

Problem

Existing cold brew coffee and tea systems are inconvenient, messy, and often require multiple sachets or result in inconsistent taste due to loose grounds, and are not leak-proof, leading to potential spills.

Innovation Solution

A self-contained system with a brewing vessel, double-layer filter bag, and tap spout that allows for easy brewing, storage, and dispensing of cold-brew beverages without additional utensils, using a single filter bag to produce over 80 fluid ounces of beverage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If loose coffee grounds are used in French press or infusion pitchers, then brewing is effective, but setup and cleaning become inconvenient and messy

Engineering Contradiction:

Improveease of setup and cleaningVSAvoidmess during setup and cleaning

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The patent employs disposable filter bags containing pre-measured coffee grounds. These single-use bags eliminate the mess of loose grounds during setup and cleaning, as users simply dispose of the bag after brewing. This directly addresses the contradiction by sacrificing the reusability of the filter medium to gain convenience and cleanliness.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The filter bag acts as an intermediary between the water and the coffee grounds. It contains the grounds during brewing, allowing easy setup without handling loose grounds, and simplifies cleaning by containing all spent grounds within the disposable bag for single-step disposal.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If multiple coffee sachets are used to achieve appropriate strength, then brewing capacity is sufficient, but the system becomes more complex and requires dilution

Engineering Contradiction:

Improvecoffee strength and volumeVSAvoidnumber of sachets and dilution steps

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The filter bag is designed as a universal container that can hold any amount of coffee grounds needed for the desired beverage strength. Users can adjust the coffee-to-water ratio by varying the amount of grounds added to the single bag, eliminating the need for multiple sachets or dilution steps while maintaining brewing capacity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system allows users to change the concentration parameter by adjusting the amount of coffee grounds in the single filter bag rather than using multiple fixed-dose sachets. This provides flexibility in achieving desired strength without increasing system complexity or requiring dilution.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If existing brew bag systems are used, then dispensing is simplified, but they are not leak-proof and cause spills during setup and dispensing

Engineering Contradiction:

Improvedispensing convenienceVSAvoidleak-proof performance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent incorporates a tap spout mechanism that replicates the reliable sealing and controlled dispensing features found in commercial beverage containers. This tap spout design provides leak-proof performance during storage and transport while maintaining ease of operation during dispensing, overcoming the limitations of simpler brew bag systems.

Inventive Principle:

Principle #26Copying

4Ease of operation

If a single filter bag is used to produce large volume beverage, then convenience is improved, but consistent taste becomes difficult to achieve

Engineering Contradiction:

Improvebrewing convenienceVSAvoidtaste consistency

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The filter bags are pre-filled with precisely measured amounts of coffee grounds during manufacturing. This preliminary action ensures consistent dosing for each bag, maintaining taste consistency even when using a single bag to brew large volumes. Users simply need to add water, eliminating the variability that would result from manual measurement.

Inventive Principle:

Principle #10Preliminary action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The system provides a smooth, flavorful, and unconcentrated beverage that can be consumed directly, reducing mess and spillage while ensuring consistent taste and convenience.

Implementation Method 1

The head of the plunger contains a screen that permits the brewed coffee to pass through while forcing the now used coffee grounds to the bottom of the carafe

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Implementation Method 2

Since many of the bitter oils and acids contained in coffee are soluble only at high temperature, coffee brewed with hot or boiling water is characterized by a harsh acrid taste. Thus, cold-brewing coffee effectively avoids this problem.

Methodology Applied

Scientific EffectCold extraction: Diffusion

Data Source

PatentUS20260060468A1System and process for preparing a cold brewed beverage

Publication Date: 2026.03.05 BEAN LAB LLC

AI summary

The subject invention relates to a system for producing and dispensing a liquid extract of coffee or tea that can be brewed in cold or room temperature water and that can be stored fresh in a refrigerator or cooler. The cold brew system comprises a brewing vessel and a double-layer filter bag system designed to reduce spilling and leaks and to improve the smoothness and flavor of the brewed beverage.