An electrically heated water kettle comprises a vessel for holding a liquid for extraction of tea, coffee or other food material. The vessel includes a partially open immersible container sized to allow the passage of water between the walls of the vessel. The container is capable of holding the mat
An electrically heated water kettle comprises a vessel for holding a liquid for extraction of tea, coffee or other food material. The vessel includes a partially open immersible container sized to allow the passage of water between the walls of the vessel. The container is capable of holding the material while an opening in the container allows the entrance of water into the container upon immersion of the container in the water. The heated kettle incorporates structure to hold the container out of the water until the water reaches an appropriate extraction temperature and to immerse or withdraw the container into or from the water as is necessary to accomplish the extraction.
대표청구항▼
What is claimed is: 1. An electrically powered heated kettle comprising an unsealed vessel for holding a vaporizable liquid, a heater capable of heating the liquid in said vessel to the boiling point of the liquid at the prevailing atmospheric pressure, an electrical heater controller to adjust the
What is claimed is: 1. An electrically powered heated kettle comprising an unsealed vessel for holding a vaporizable liquid, a heater capable of heating the liquid in said vessel to the boiling point of the liquid at the prevailing atmospheric pressure, an electrical heater controller to adjust the amount of power delivered to said heater, an electronic signal processor to direct said controller to adjust the amount of electrical power to said heater, an electrical sensor located to generate an electrical signal that varies predictably with the temperature of the liquid or the air/vapor mixture directly adjacent the liquid in said vessel as the liquid is heated by said heater to the boiling point, and to transmit said signal to said electrical signal processor, whereby said processor can determine the instant in time that the rate of rise of liquid temperature essentially goes to zero and can therefore establish that the liquid is boiling and direct said controller to reduce the amount of electrical power delivered to said heater. 2. An electrically powered heated kettle according to claim 1 where said controller reduces the amount of electrical power delivered to said heater in order to reduce or terminate boiling of the liquid. 3. An electrically powered heated kettle according to claim 1 including at least one manually actuated control to preset the desired liquid temperature or other operating parameters for said electronic signal processor and controller. 4. An electrically powered heated kettle according to claim 1 where said processor can store said signal or value representing the temperature of the liquid boiling point. 5. An electrically heated water kettle comprising an electrical heater, a heater controller, a thermal sensor located to generate a signal predictably responsive to the temperature of the water or its vapor, an associated electronic processor to monitor the signal output of said sensor while the water is being heated and to sense the rate of rise of that output signal indicative of water temperature to detect the instant in time that the rate of rise of water temperature goes essentially to zero, which the electronic processor can identify as the beginning of boiling at the local atmospheric pressure and direct the heater controller to reduce the electrical power applied to the heater. 6. An electrically heated water kettle for holding water comprising at least one heater of the water, a controller to adjust the amount of heat applied to the water, a thermal detector with a parameter that is predictably responsive to the temperature of the water or its vapor, an electronic processor to monitor that responsive parameter as the water is heated and to determine the rate of change of that parameter in order to establish the instant in time that the rate of temperature rise goes to zero as an indication of the beginning of water boiling at the local atmospheric pressure and to then cause said controller to reduce the electrical power applied to said at least one heater. 7. An electrically powered heated water kettle comprising a heater for the water, a temperature sensor mounted in thermal contact with one of the water and the kettle to create a signal directly correlatable with the water temperature in the kettle, an electrical processor/controller to receive said signal from the sensor to determine the rate of rise of said signal and to control power function selected from the group consisting of turning off, and adjusting the amount of power delivered to said heater when the rate of change of the water temperature reaches a predetermined rate. 8. An electrically powered heated water kettle to claim 7 where the processor/controller controls the power function when the rate of rise of the water temperature signal approaches zero indicating the water is boiling. 9. An electrically powered heated water kettle according to claim 7 where the processor/controller turns off or reduces the amount of power delivered to said heater when the rate of rise of the water temperature signal becomes higher than a predetermined rate indicating the water level in the kettle is too low or the kettle is in the process of boiling dry. 10. An electrically powered heated water kettle comprising a heater for the water, a temperature sensor mounted in thermal contact with one of the water, the vapor space and the kettle to create a signal directly correlatable with the temperature of the water in the kettle, and an electrical processor/controller to receive said signal from said sensor to monitor the rate of change of that signal and to adjust the amount of power delivered to the heater in accordance with the measured rate of temperature change or according to the change in that rate. 11. An electrically powered heated water kettle according to claim 10 where the processor/controller appropriately adjusts the power to the heater when the rate of water temperature change or when the rate of change of that rate indicates that the water is at or approaching boiling or that an abnormal or potentially unsafe operating condition exists. 12. An electrically powered heated water kettle according to claim 11 where the potentially unsafe condition is that the water is boiling and that the kettle is in danger of boiling dry. 13. An electrically powered heated water kettle according to claim 11 where the abnormal operating condition is insufficient or no water in the kettle and the kettle is in danger of boiling dry. 14. An electrically powered heated water kettle comprising a heater for the water, a temperature sensor mounted in thermal contact with one of the water, the vapor space and the kettle to create a signal directly related to the water in the kettle, an electrical processor/controller that receives said signal from the sensor and controls the amount of power delivered to the heater in accordance with the users control settings and the measured rate of temperature change of the water and reduces the amount of power to the heater if the rate of change of water temperature is abnormal indicating the kettle is dry or in the process of boiling dry. 15. An electrically powered heated water kettle comprising a heater for the water, a temperature sensor mounted in thermal contact with the water, the vapor space of kettle to create a signal directly correlatable with the temperature of water in the kettle, an electrical processor/controller to receive said signal from the sensor to monitor the rate of change of that signal with time and to adjust the amount of power delivered to the heater in accordance with the measured rate of temperature change with time or according to the change of that rate with time. 16. An electrically powered heater water kettle according to claim 15 where the processor/controller monitors the rate of change of the water temperature with time to determine during periods of water heating and cooling the amount of water in the kettle, to determine the presence of operational abnormalities, and at all times based on these determinations to adjust operating parameters to optimize kettle performance or to correct operational abnormalities. 17. An electrically powered heated kettle according to claim 15 where the processor/controller monitors the rate of change of the water temperature with time to determine during periods of water heating and cooling the amount of water in the kettle, to determine the presence of operational abnormalities and at all times based on these determinations can actuate displays or otherwise signal the user to take appropriate action that will optimize, modify, or correct the kettle performance. 18. An electrically powered heated water kettle comprising a heater for the water, a temperature sensor mounted in thermal contact with the water, the vapor space or kettle to create a signal directly correlatable with the temperature of the water in the kettle, an electrical processor/controller to receive such signal from the sensor to monitor the rate of change of that signal when the water is being heated by said heater and when the water is allowed to cool with no power applied to the heater and to determine from the rates of change the actual amount of water in the kettle and whether the kettle lid is closed. 19. An electrically powered heated water kettle comprising a heater for the water, a temperature sensor mounted in thermal contact with the water, the vapor space or kettle to create a signal directly correlatable with the temperature of the water in the kettle, an electrical processor/controller to receive said signal from the sensor to monitor the rate of change of that signal with time and to adjust the amount of power delivered to the heater in accordance with the measured rate of temperature change with time or according to the change of the rate with time. 20. An electrically powered heated water kettle according to claim 19 where said electrical processor/controller can store said signal, compute the rate of change of said signal to determine the instant in time when the rate of rise of the water temperature goes to zero and can therefore establish that the liquid is boiling and can at that time reduce the amount of electrical power delivered to the heater. 21. An electrical powered water kettle according to claim 19 comprising at least one water heater. 22. An electrical powered water kettle according to claim 19 which also comprises a manually actuated control that can be set by the user to a desired water temperature where said processor/controller can monitor the signal from said sensor and reduce the power to said heater as the water temperature approaches said desired water temperature. 23. An electrically powered heated water kettle according to claim 19 where the processor/controller appropriately adjusts the power to the heater when the rate of water temperature change or when the rate of change of that rate indicates that the water is at or approaching boiling or that an abnormal or potentially unsafe operating condition exists. 24. An electrically powered heated water kettle according to claim 23 where the potentially unsafe condition is that the water is boiling and that the kettle is in danger of boiling dry. 25. An electrically powered heated water kettle according to claim 23 where the abnormal operating condition is an inadequate amount of water or no water in the kettle and the kettle is in danger of boiling dry. 26. An electrically powered heated water kettle according to claim 19 where the processor/controller can store the received signals from the sensor, determine the rate of change of the water temperature with time and make appropriate adjustments to the amount of power delivered to the heater or kettle. 27. An electrically powered heated water kettle according to claim 26 where the processor/controller establishes and stores the temperature at which water boils at the local atmospheric pressure, and controls power to the heater at subsequent time to prevent the water from boiling. 28. An electrically powered heated water kettle according to claim 19 comprising an electrically powered visual display to indicate the water level in the kettle where the processor/controller determines the rate of change of the water temperature as the temperature is rising, uses that rate to compute the level or amount of water in the kettle and transmits that information to the visual display. 29. An electrically powered heated water kettle comprising a heater for the water, a temperature sensor mounted in thermal contact with one of the water and the kettle to create a signal directly correlatable with the water temperature in the kettle, and an electrical processor/controller to receive said signal from the sensor to determine the rate of rise of said signal and to turn on a lower powered heater or to reduce power to maintain a slowly boiling condition.
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이 특허에 인용된 특허 (5)
Sham John C. K.,HKX ; Kunavongvorakul Kumkit,THX, Automatic French Press beverage maker.
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