Pressurized Coffee Brewing Chamber for Large-Serving Crema
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Solution Overview
Problem
Existing coffee brewing methods fail to produce large servings of low-concentration coffee with the desirable characteristics of espresso, such as enhanced flavor and a lasting crema layer, which are essential for American coffee preferences.
Innovation Solution
A method and apparatus that involve transferring ground coffee to a brewing chamber, compressing it with a piston mechanism, and forcing pressurized hot water through the coffee using a microfilter, with a ratio of ground coffee to water volume of 6 grams per fluid ounce or less, to produce a large serving of coffee with a crema layer that lasts for at least 10 minutes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If espresso is made using traditional methods with high concentration of ground coffee to water ratio, then flavor intensity and crema quality are improved, but serving size becomes very small and coffee becomes too thick and concentrated for American preferences
Solution Approach 1:
The patent applies parameter changes by adjusting the ground coffee to water ratio from traditional espresso concentrations (typically 1:2 or higher) to a lower concentration of 6 grams per fluid ounce or less. This parameter modification allows the system to produce larger servings with lower concentration that match American coffee preferences while still maintaining the essential characteristics of espresso brewing through controlled extraction parameters.
2Manufacturing precision
If ground coffee is compressed with high pressure to improve extraction efficiency and crema formation, then flavor quality is improved, but the apparatus complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the compression function into a separate, dedicated piston mechanism that operates independently within the brewing chamber. This segmented approach allows the compression function to be optimized for extraction quality while being mechanically simple and easy to implement, rather than integrating compression into a complex multi-functional system.
Solution Approach 2:
The patent uses a piston as an intermediary mechanical element that transfers force from the user or motor to the ground coffee in a controlled manner. This intermediary mechanism provides the necessary compression for quality extraction and crema formation while keeping the overall apparatus design simple and maintainable.
3Quantity of substance
If hot water contact time with ground coffee is extended to extract more flavor compounds, then extraction efficiency is improved, but flavor components are damaged and crema quality deteriorates
Solution Approach 1:
The patent applies the 'rushing through' principle by forcing hot water through the compressed ground coffee quickly under pressure, achieving rapid extraction of flavor compounds in a short contact time. This rapid extraction method extracts sufficient flavor without the prolonged contact that would damage volatile aromatic compounds and degrade crema quality, maintaining the characteristic espresso profile.
Solution Approach 2:
The patent uses hydraulic pressure to force hot water through the compressed coffee grounds, enabling controlled, rapid extraction. The pressurized water flow achieves efficient extraction of flavor compounds while maintaining brief contact time, preventing degradation of volatile aromatic components and preserving crema quality.
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 solution effectively produces a large serving of coffee with enhanced flavor and a lasting crema layer, addressing the need for American-style coffee that maintains the flavor and visual appeal of espresso while accommodating larger serving sizes.
Implementation Method 1
compressing the ground coffee
Implementation Method 2
forcing pressurized hot water through the ground coffee
Implementation Method 3
causing brewed coffee to emerge through a micro-filter
Data Source
AI summary
Apparatus for brewing coffee comprising a brewing chamber for receiving programmable quantities of ground coffee and combining the ground coffee with quantities of hot, pressurized water, a piston for compressing the ground coffee in the brewing chamber, and an o-ring fitted to the outside of the piston so as to maintain a pressure-tight seal against the wall of the brewing chamber.