# US 2017/0280918 A1 · Apparatus and method for extracting dutch coffee

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- Number: US 2017/0280918 A1
- Document ID: US20170280918A1
- Status: Published application
- Kind: A1
- Application number: 15/506,952
- Filed: 2015-08-07
- Published: 2017-10-05
- Earliest claimed: 2015-07-31
- Assignees: Onedutch Co., Ltd.
- Applicants: Onedutch Co., Ltd.
- Inventors: Sung Kyun SHIN
- Web page: https://patentgrep.com/patent/US20170280918A1

## CPC

- A47J 31/24: Coffee-making apparatus in which hot water is passed through the filter under pressure, {i.e. in which the coffee grounds are extracted under pressure}(A47J31/043 {and A47J31/40} take precedence)
- A47J 31/02: Coffee-making machines with removable extraction cups, to be placed on top of drinking-vessels {i.e. coffee-makers with removable brewing vessels, to be placed on top of beverage containers, into which hot water is poured}, e.g. cafe filter (filters A47J31/06)
- A47J 31/06: Filters or strainers for coffee or tea makers {; Holders therefor}
- A47J 31/0621: {with means for varying the infusion outflow velocity, e.g. for brewing smaller quantities}
- A47J 31/0631: {with means for better or quicker spreading the infusion liquid over the filter (spreader plates for drip coffee makers A47J31/4478)}
- A47J 31/10: Coffee-making apparatus, in which the brewing vessel {, i.e. water heating container}, is placed above or in the upper part of the beverage containers {i.e. brewing vessel}; Drip coffee-makers {with the water heating container in a higher position than the brewing vessel} (A47J31/02 takes precedence)
- A47J 31/40: Beverage-making apparatus with dispensing means for adding a measured quantity of ingredients, e.g. coffee, water, sugar, cocoa, milk, tea
- A47J 31/402: {Liquid dosing devices}
- A47J 31/46: Dispensing spouts, pumps, drain valves or like liquid transporting devices
- A47J 31/52: Alarm-clock-controlled mechanisms for coffee- or tea-making apparatus {; Timers for coffee- or tea-making apparatus; Electronic control devices for coffee- or tea-making apparatus}
- A47J 31/00: Apparatus for making beverages (household machines or implements for straining foodstuffs A47J19/00; preparation of non-alcoholic beverages, e.g. by adding ingredients to fruit or vegetable juices, A23L2/00; coffee or tea pots A47G19/14; tea infusers A47G19/16; brewing of beer C12C; preparation of wine or other alcoholic beverages C12G)
- A47J: KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES

## Abstract

The present invention relates to a method for extracting Dutch coffee and an apparatus thereof, and more particularly, to a method for extracting Dutch coffee, which can exactly control a speed of extraction of Dutch coffee and an amount of coffee to be extracted by supplying water during a predetermined time repeatedly at regular time intervals in each step, can always provide Dutch coffee of a constant concentration to consumers by uniformly distributing water to a filtering container, and can provide a rich aroma of Dutch coffee by collecting the aroma of Dutch coffee not to dissipate, and an apparatus thereof. The method for extracting Dutch coffee controls an amount of extracted coffee by setting an opening time of a valve mounted between a water tank and a filtering container, controls a speed of extraction by setting one cycle length, and mechanically controls a total speed of extraction by setting a total time, and the Dutch coffee extraction apparatus includes: an upper main body frame; a lower main body frame which is formed on a lower portion of the upper main body frame and has a width shorter than that of the upper main body frame; a side frame which connects the upper main body frame and the lower main body frame with each other; a water tank which is disposed inside the upper main body frame and has a cover provided on an upper portion thereof to store water therein; a filtering container which is disposed at both sides of the lower main body frame, is connected with the water tank via a nozzle to receive water from the water tank, and stores ground coffee thereon; an extracted liquid storage container which is disposed under the filtering container to store an extracted liquid thereon; and a digital operation unit which is formed on one side of the side frame.

## Claims

### Claim 1

A Dutch coffee extraction apparatus comprising:
an upper main body frame;
a lower main body frame which is formed on a lower portion of the upper main body frame and has a width shorter than that of the upper main body frame;
a side frame which connects the upper main body frame and the lower main body frame with each other;
a water tank which is disposed inside the upper main body frame and has a cover provided on an upper portion thereof to store water therein;
a filtering container which is disposed at both sides of the lower main body frame, is connected with the water tank via a nozzle to receive water from the water tank, and stores ground coffee thereon;
an extracted liquid storage container which is disposed under the filtering container to store an extracted liquid thereon; and
a digital operation unit which is formed on one side of the side frame,
wherein the filtering container comprises:
a container main body which is formed in a cylindrical shape, penetrating from top to bottom;
a distributing means which comprises: a water supply surface which is formed on the upper end of the container main body and is downwardly inclined from the center toward the side surface so as to spray water supplied through the nozzle into the container main body; a water flow blocking surface which is upwardly inclined from the end of the water supply surface toward the side surface; a plurality of water passing holes passing through the top surface and the bottom surface of the water supply surface; and a center drop inducing means which is formed on the top surface and the bottom surface of the water supply surface at a point spaced from the center of the water supply surface toward the outer circumference by a predetermined distance, and protrudes in an annular shape so as to prevent the supplied water from flowing down along the wall surface of the filtering container;
a filtering container upper cover which is formed to cover the upper portion of the distributing means and has a water supply portion formed thereon to receive water from the water tank; and
a filtering container lower cover which has an upper portion inserted into the inner surface of the lower portion of the container main body, and a lower portion formed in a funnel shape.

### Claim 2 (depends on 1)

The Dutch coffee extraction apparatus of claim 1, wherein an extraction inducing means is inserted into the filtering container lower cover, and comprises a body which is formed in a cylindrical shape and is hollow inside, and a plurality of ribs which are formed on the cylindrical body in a radial direction to as to correspond to an inner inclined surface of the filtering container lower cover.

### Claim 3 (depends on 2)

The Dutch coffee extraction apparatus of claim 2, wherein a filter is additionally provided on the upper portions of the ribs and coffee powder is contained on the upper portion of the filter.

### Claim 4 (depends on 1)

The Dutch coffee extraction apparatus of claim 1, wherein a suction inducing means is additionally formed on the top surface of the filtering container upper cover, and is downwardly inclined from a point spaced from the circumference of the top surface by a predetermined distance to the water supply portion to prevent the aroma of extracted Dutch coffee from dissipating.

### Claim 5 (depends on 1)

The Dutch coffee extraction apparatus of claim 1, wherein each of the water passing holes is formed by passing through the water supply surface and has a diameter larger on a bottom surface than a top surface, and the water passing holes are formed to draw concentric circles on the water supply surface, and
wherein the plurality of water passing holes are formed from the center of the water supply surface along the outer circumference at regular intervals.

### Claim 6 (depends on 1)

The Dutch coffee extraction apparatus of claim 1, wherein the filtering container lower cover comprises:
a container main body insertion portion which is inserted into the container main body, being spaced from the circumference of the container main body by a predetermined distance, and is inwardly inclined;
a container main body contacting portion which protrudes from the lower portion of the container main body insertion portion outwardly, and has a sealing member inserted thereinto so as to be brought into close contact with the container main body;
a vertical portion which vertically extends from the bottom surface of the container main body contacting portion at a point inwardly spaced from the circumference of the container main body contacting portion;
a container main body seating portion which protrudes from the end of the vertical portion outwardly so as to have the end of the container main body seated thereon; and
a funnel portion which is downwardly inclined from the lower portion of the container main body seating portion toward the center, and has an extraction pipe passing through the center thereof in a vertical direction.

### Claim 7 (depends on 1)

The Dutch coffee extraction apparatus of claim 1, wherein the digital operation unit which sets to operate by adjusting a valve opening time, one cycle length, and a total time in a maceration step, an extraction step, and a concentration adjustment step, comprises:
a maceration step setting display unit which displays set times of the maceration step, and comprises a first opening interval display member for displaying one cycle length, a first opening time display member for displaying a valve opening time, and a first total time display member for displaying a total time;
an extraction step setting display unit which displays set times of the extraction step, and comprises a second opening interval display member for displaying one cycle length, a second opening time display member for displaying a valve opening time, and a second total time display member for displaying a total time; and
a concentration adjustment setting display unit which displays set times of the concentration adjustment step, and comprises a third opening interval display member for displaying one cycle length, a third opening time display member for displaying a valve opening time, and a third total time display member for displaying a total time.

### Claim 8

A method for extracting Dutch coffee, which controls an amount of extracted coffee by setting an opening time of a valve mounted between a water tank and a filtering container, controls a speed of extraction by setting one cycle length, and mechanically controls a total speed of extraction by setting a total time, the method comprising an extraction step of continuously extracting Dutch coffee, and
wherein, in the extraction step, the opening time of the valve is set to 0.01-10 seconds, one cycle length is set to 1-99 seconds, and the total time required to repeat opening and closing of the valve is set to 2-24 hours.

### Claim 9 (depends on 8)

The method of claim 8, further comprising, before the extraction step, a maceration step of macerating coffee powder by pouring water over coffee powder contained in the filtering container such that the coffee powder absorbs water and coffee is extracted, and
wherein, in the maceration step, the opening time of the valve is set to 0.1 to 99 seconds, one cycle length is set to 10-99 minutes, and the total time is set to 10 minutes to 3 hours.

### Claim 10 (depends on 8)

The method of claim 8, further comprising, after the extraction step, a concentration adjustment step of adjusting a concentration of Dutch coffee at the same time of extracting Dutch coffee, and
wherein, in the concentration adjustment step, the opening time of the valve is set to 0.01 to 10 seconds, one cycle length is set to 1-99 seconds, and the total time is set to 10 minutes to 3 hours.

### Claim 11 (depends on 9)

The method of claim 9, wherein, in the maceration step, the opening time of the valve is set such that an amount of water supplied to the filtering container is made to be 5-20 wt % of an amount of coffee powder contained in the filtering container.