Patent ID: 8635944

Claim:
An automatically controlled coffee machine for preparing a fresh, cold, coffee-based beverage, comprising: a storage container for ground coffee or whole-bean coffee ground as needed with a grinding device; a first cold water feeding tube; a pressure-control device connected in the first cold water feeding tube to provide a required water pressure; a brewing chamber to prepare fresh coffee concentrate from the ground coffee; a metering device to meter the ground coffee from the storage device or the grinding device into the brewing chamber; a heating unit coupled to the first cold water feeding tube a hot water feeding tube coupled to the heating unit and coupled between the pressure-control device and the brewing chamber to pre-brew and brew the coffee concentrate, wherein the hot water feeding tube feeds in hot water to the brewing chamber; a monitoring unit configured to determine a concentration for the brewed coffee concentrate in the brewing chamber; a control device configured to interrupt the feed in of hot water to the brewing chamber when the monitoring unit determines the concentration of the brewed coffee concentrate in the brewing chamber reaches a specified limit and drops below the specified limit; a beverage dispenser connected to the brewing chamber to dispense the brewed coffee concentrate; a second cold water feeding tube connected to a dispenser; and a mixing chamber to mix the coffee concentrate with cold water from the second cold water feeding tube.