# US 9,434,918 B1 · System for aging beer

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- Number: US 9,434,918 B1
- Document ID: US9434918B1
- Status: Granted
- Kind: B1
- Application number: 14/669,504
- Filed: 2015-03-26
- Published: 2016-09-29
- Granted: 2016-09-06
- Earliest claimed: 2015-03-26
- Applicants: Sandya Lakshmi Narasimhan; Dave Narasimhan; Joseph Francis Leibrandt
- Inventors: Sandya Lakshmi Narasimhan; Dave Narasimhan; Joseph Francis Leibrandt
- Web page: https://patentgrep.com/patent/US9434918B1

## CPC

- C12H 1/22: Ageing or ripening by storing, e.g. lagering of beer
- C12C 12/00: Processes specially adapted for making special kinds of beer
- C12H 1/16: by physical means, e.g. irradiation
- F25D 17/042: {Air treating means within refrigerated spaces (air conditioning in general F24F)}
- F25B 21/02: using Peltier effect; using Nernst-Ettinghausen effect
- F25D 31/007: {Bottles or cans}
- F25D 2317/04131: Control means therefor
- F25D 2331/803: Bottles
- F25D 2500/04: Calculation of parameters
- F25D 2600/06: Controlling according to a predetermined profile
- C12H: PASTEURISATION, STERILISATION, PRESERVATION, PURIFICATION, CLARIFICATION OR AGEING OF ALCOHOLIC BEVERAGES; METHODS FOR ALTERING THE ALCOHOL CONTENT OF FERMENTED SOLUTIONS OR ALCOHOLIC BEVERAGES (simulation ageing by flavouring C12G3/06)
- C12C: BEER; PREPARATION OF BEER BY FERMENTATION (ageing or ripening by storing C12H1/22; methods for reducing the alcohol content after fermentation C12H3/00; methods for increasing the alcohol content after fermentation C12H6/00; venting devices for casks, barrels or the like C12L9/00); PREPARATION OF MALT FOR MAKING BEER; PREPARATION OF HOPS FOR MAKING BEER
- F25D: REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR (refrigerated showcases A47F3/04; thermally-insulated vessels for domestic use A47J41/00; refrigerated vehicles, see the appropriate subclasses of classes B60 - B64; containers with thermal insulation in general B65D81/38; heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants, or materials for the production of heat or cold by chemical reactions other than by combustion C09K5/00; thermally-insulated vessels for liquefied or solidified gases F17C; air-conditioning or air-humidification F24F; refrigeration machines, plants, or systems F25B; cooling of instruments or comparable apparatus without refrigeration G12B)
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS

## Abstract

An insulated beer fridge stores and ages corked craft beer in a vertical orientation for a period of several months to years without degrading the cork stopper used to seal the bottle. Cork shrinkage is prevented by controlling the humidity within the beer fridge container within a range of 50% to 70% relative humidity. An optimal beer aging temperature in the range of 10° C. (50° F.) to 15.6° C. (60° F.) is maintained by a refrigeration system. Relative humidity within the beer fridge containment is actively maintained by a humidity replenishment mechanism. A controller calculates the amount of water needed to bring the relative humidity to 50% to 70% at the beer fridge temperature. Beers are stored in the beer fridge on trays, which can be pulled for removal of aged beer and addition of new corked craft beer.

## Claims

### Claim 1

An insulated beer refrigerator system, comprising
a. a beer refrigerator container having a sealed enclosure with a darkened green glass front door preventing exposure of stored beer to blue or ultraviolet rays or sunlight, which can degrade beer rapidly;
b. said beer refrigerator system having a temperature maintaining subsystem keeping beer refrigerator interior temperature in the range of 10° C. (50° F.) to 15.6° C. (60° F.) and having a humidity maintaining subsystem, keeping beer refrigerator interior relative humidity in the range of 50% to 70%, said subsystems working in combination;
c. said temperature maintaining subsystem comprising a thermal sensor and a knob for setting a temperature set point associated with a cooling system, for driving and circulating cooled air into the interior of the beer refrigerator;
d. said humidity maintaining subsystem comprising a humidity sensor for measuring relative humidity of the beer refrigerator interior, and being operative when the relative humidity measured is less than 50% to cause the humidity maintaining subsystem to calculate, using an equation (A) with measured beer refrigerator temperature, an amount of water per cubic meter to be injected into the interior of the beer refrigerator by a humidity replacement means to bring the relative humidity in the range of 50% to 70%;
e. said humidity replacement means delivering the calculated amount of water into the cooled air supply path of the beer refrigerator;
f. said beer refrigerator having a plurality of corked craft beer bottles stored vertically on a plurality of sliding trays, wherein the sliding trays provide for removal of an aged beer or adding new beer;
g. said beer refrigerator having an interior light with wavelength in the range of 510 nm to 650 nm, for illuminating the interior of the beer refrigerator when the front door is opened;
whereby said beer refrigerator has an optimal beer aging temperature and the amount of relative humidity maintained in combination by a control system within the beer refrigerator inhibits cork shrinkage, which prevents ingress of air and spoilage of beer.

### Claim 2 (depends on 1)

The insulated beer refrigerator system as recited by claim 1, wherein said darkened green glass front door allows light only of wavelengths ranging from 510 nm to 650 nm.

### Claim 3 (depends on 1)

The insulated beer refrigerator system as recited by claim 1, wherein said cooled air is circulated around the stored beer bottles using an air-circulating fan.

### Claim 4 (depends on 1)

The insulated beer refrigerator system as recited by claim 1, wherein the temperature sensor is a thermocouple.

### Claim 5 (depends on 1)

The insulated beer refrigerator system as recited by claim 1, wherein the temperature sensor is a resistance thermometer.

### Claim 6 (depends on 1)

The insulated beer refrigerator system as recited by claim 1, wherein the humidity sensor is a thin polymer film capacitor.

### Claim 7 (depends on 1)

The insulated beer refrigerator system as recited by claim 1, wherein the humidity sensor is a resistive humidity sensor.

### Claim 8 (depends on 1)

The insulated beer refrigerator system as recited by claim 1, wherein said front door is hinged at one end.

### Claim 9 (depends on 1)

The insulated beer refrigerator system as recited by claim 1, wherein said front door is a sliding glass door.

### Claim 10 (depends on 1)

The insulated beer refrigerator system as recited by claim 1, wherein said control system drives a cooling system that is a refrigeration machine capable of cooling contents only in the range of 10° C. (50° F.) to 15.6° C.

### Claim 11 (depends on 1)

The insulated beer refrigerator system as recited by claim 1, wherein said control system drives a cooling system that is a thermoelectric cooler.

### Claim 12 (depends on 1)

The insulated beer fridge system as recited by claim 1, wherein said humidity replacement means is an atomized spray of a calculated magnitude of water into the beer refrigerator interior.

### Claim 13 (depends on 1)

The insulated beer refrigerator system as recited by claim 1, wherein said humidity replacement means is volatilized steam of a calculated magnitude of water into the beer refrigerator interior.

### Claim 14 (depends on 1)

The insulated beer refrigerator system as recited by claim 1, wherein a soaked porous substrate evaporates a calculated magnitude of water into the beer refrigerator interior.

### Claim 15 (depends on 1)

The insulated beer refrigerator system as recited by claim 1, wherein said container has a vent hole to prevent pressure build up within the beer refrigerator interior.

### Claim 16 (depends on 1)

The insulated beer refrigerator system as recited by claim 1, wherein said corked craft beer bottles are about 750 ml.

### Claim 17 (depends on 1)

The insulated beer refrigerator system as recited by claim 1, wherein said corked craft beer bottles are smaller than 750 ml.

### Claim 18 (depends on 1)

The insulated beer refrigerator system as recited by claim 1, wherein said beer refrigerator has a dimension of about 96 cm×76 cm×62 cm, small enough to fit within a home.

### Claim 19 (depends on 1)

The insulated beer refrigerator system as recited by claim 1, wherein said beer refrigerator has a dimension of about 152 cm×76 cm-×62 cm, large enough to store and age craft beer in a beer pub or restaurant.