The invention also pertains to a method of cooling contents in a container with microwave radiation by a microwave oven.

Background art Refrigerators and freezers are used both domestically and in the food industry for cooling and freezing food and beverages. Other areas where it is common practice to cool and freeze substances and samples are within healthcare, medical research and the processing industry. Compressors are widely used in the fridges and freezers of today to provide a cooling/freezing, which is effective but not very fast. Such fridges/freezers also rely on being constantly activated since a lowering of the temperature to desired levels at each time of practical utilization thereof would be time-consuming.

Picnic bags, cool boxes and cooling insulator cups with inherent electric cooling through battery connection or the electric mains are sometimes used for keeping food and drinks cold during warm weather, but are limited due to the low cooling effect achieved and are often only capable of keeping the temperature of their contents at a steady level. They are not really suited to cool or freeze their contents to temperatures much lower than a temperature it had before being put in the bag, box or cup.

These and other currently known solutions for cooling or freezing food, drinks and other substances have drawbacks with achieving a limited cooling effect and thus they all provide a cooling/freezing, which is relatively slow. Furthermore the prior art coolers/freezers are not suited for short-term temporary cooling or freezing due to the waste of energy involved with them being constantly activated for cooling/freezing and the start-up period from being turned off for the prior art coolers/freezers is just to long for it to be a possible option to frequently switch them on and off at need for cooling.

There is a need for a more effective and fast cooling/freezing of foods, beverages and other substances with a cooler also incorporating means for concurrently controlling and visualizing the temperature as it is decreasing in the cooled object and/or area in which it is being cooled. Means for manual activation and deactivation of such a cooler by a simple control knob, switch or button is thus desirable.

Summary of the disclosed invention The present invention relates to a container for cooling its interior via microwaves and to a method for cooling contents in a container by microwave radiation.

The container and method provide rapid, effective and controllable cooling of contents such as food, beverages and also other substances such as samples, specimens and objects processed and treated by cooling, for example for healthcare-, research-, laboratory-and industrial processing purposes.

To achieve aims and objectives the present invention provides a container for interior cooling by reception of microwave radiation. The container comprises a lid, at least one integrated electrical cooler, at least one integrated microwave receiving rectenna, and at least one integrated microwave shield for shielding microwaves from reaching the interior of the container. Container incident microwaves are received and converted into direct-current voltage (DC) through the rectenna, which powers the electrical cooler for cooling the interior of the container.

One embodiment of the container according to the present invention comprises that the cooler is a peltier cooling element.

In another embodiment of the container according to the present invention, the rectenna comprises at least one microwave receiving antenna, a low pass filter, a rectifying diode, a DC filter and a load resistor.

In a further embodiment of the container according to the present invention, the microwave shield is a metal sheet or metal net with small apertures.

Another embodiment of the container according to the present invention comprises that the rectenna is a diode rectenna.

Yet a further embodiment of the container according to the present invention comprises that the antennas are dipole, patch or loop antennas or an array of such antennas.

Yet another embodiment of the container according to the present invention comprises that the rectenna and the microwave shield are integrated as separate layers in the walls of the container.

In a further embodiment of the container according to the present invention, a bottom wall-section comprises an outermost microwave-shield layer, a rectenna electric circuit layer and an innermost electric cooling layer.

In yet another embodiment of the container according to the present invention, a closed side wall-section comprises an outermost microwave-receiving rectenna layer, a microwave-shield layer and an innermost electric cooling layer.

In a yet further embodiment of the container according to the present invention, the lid comprises at least one of an outermost microwave receiving rectenna layer, a microwave- shield layer and an innermost cooling layer.

An additional embodiment of the container according to the present invention comprises that incident microwaves are received by the rectenna antennas in the lid-and

side wall-sections and are converted into direct-current voltage (DC) through the electric circuitry of the rectenna, which is integrated in the bottom wall-section for powering the electrical coolers in the innermost bottom and side wall-sections of the container for cooling its interior through the innermost bottom and side wall-section surfaces.

Other embodiments of the container according to the present invention comprises that it is manufactured in aluminum, plastic or ceramic material or that it is manufactured in a microwave absorbing material.

Further embodiments of the container according to the present invention comprises that it has rounded forms and that the microwave radiation is provided by a microwave oven.

Additionally one embodiment of the container according to the present invention comprises that a thermometer is integrated in the container displaying a temperature of at least one of the container, cooler and a content provided therein.

The present invention further sets forth a method for cooling contents in a container by microwave radiation. The container comprises a lid, at least one integrated electrical cooler, at least one integrated microwave receiving rectenna, and at least one integrated microwave shield for shielding microwaves from reaching the interior of the container. The method comprises the steps of: sealing the container through closing the container lid ; applying microwave radiation onto the outer surfaces of the container by utilizing a microwave oven; and wherein container incident microwaves are received and converted into direct- current voltage (DC) through the rectenna, which powers the electrical cooler for cooling the interior of the container and its contents.

One embodiment of the method according to the present invention comprises that the cooling is accomplished by an integrated peltier cooling element.

In another embodiment of the method according to the present invention, the rectenna is arranged to comprise at least one microwave receiving antenna, a low pass filter, a rectifying diode, a DC filter and a load resistor.

In a further embodiment of the method according to the present invention, the microwave shield is arranged to comprise a metal sheet or metal net with small apertures.

Another embodiment of the method according to the present invention comprises that the rectenna is arranged to comprise a diode rectenna.

Yet a further embodiment of the method according to the present invention comprises that the antennas are arranged to comprise dipole, patch or loop antennas or an array of such antennas.

Yet another embodiment of the method according to the present invention comprises that the electrical cooler, the rectenna and the microwave shield are arranged to be integrated as separate layers in the walls of the container.

In a further embodiment of a method according to the present invention, a bottom wall-section of the container is arranged to comprise an outermost microwave-shield layer, a rectenna electric circuit layer and an innermost electric cooling layer.

In yet another embodiment of a method according to the present invention, a closed side wall-section of the container is arranged to comprise an outermost microwave-receiving rectenna layer, a microwave-shield layer and an innermost electric cooling layer.

In a yet further embodiment of the method according to the present invention, the lid of the container is arranged to comprise at least one of an outermost microwave receiving rectenna layer, a microwave-shield layer and an innermost cooling layer.

An additional embodiment of the method according to the present invention comprises that incident microwaves are received by the rectenna antennas in the lid-and side wall-sections and are converted into direct-current voltage (DC) through the electric circuitry of the rectenna, arranged in the bottom wall-section, for powering the electrical coolers in the innermost bottom and side wall-sections of the container thus cooling the interior of the container through the innermost bottom and side wall-section surfaces.

Other embodiments of the method according to the present invention comprises that the container is manufactured in aluminum, plastic or ceramic material or that the container is manufactured in a microwave absorbing material.

Further embodiments of the method according to the present invention comprises that the container is manufactured with rounded forms and that wherein the microwave radiation is provided by a user activating the microwave oven.

Additionally one embodiment of the method according to the present invention comprises that a thermometer, integrated in the container, displays a temperature reading of at least one of the container, coolers and the content provided therein.

Brief description of the drawings Henceforth reference is had to the attached figures for a better understanding of the present invention and its examples and embodiments, wherein the: Fig. 1 schematically illustrates a container 10 with a rectenna 50 for interior cooling by microwave radiation, according to one embodiment of the present invention; Fig. 2 in a block diagram schematically illustrates a rectenna for receiving and converting microwave radiation into direct current for powering cooling elements in a container, according to one embodiment of the present invention; and

Fig. 3 schematically illustrates a circuit diagram of a rectenna used in a container for cooling its interior via thereby powered cooling elements, according to one embodiment of the present invention.

Detailed description of preferred embodiments The present invention sets forth a container, which is specially adapted for interior cooling by reception of microwave radiation and to a method for cooling contents in such a container by utilizing microwave radiation generated in a microwave oven.

High power is needed for accomplishing an effective and fast cooling of substances such as food, beverages and the like, which means that a powerful source of power is needed. Such power sources are both relatively bulky and expensive and the level of power generated sets forth requirements on safety regulations where humans and animals are protected during their operation.

Microwave ovens are high power generators used for warming/heating substances, preferably food and beverages, and are currently found in many homes and places of work.

The present invention according to one embodiment thereof utilizes the high power generated in a microwave oven for cooling substances by providing a container specially adapted for this purpose, which receives and utilizes the microwaves for cooling contents provided therein.

In fig. 1, a container 10 provided with a rectenna layer 50 for interior cooling by microwave radiation is schematically illustrated according to one embodiment of the present invention. Microwaves have a warming/heating effect on the water contained in substances being exposed to them. It is thus important to protect/shield a substance or content provided in the container 10 for cooling purposes from these heating rays and a container lid 20 is therefore arranged on top of the container for microwave shielding purposes. The container 10 is provided the rectenna 50 integrated as an outermost layer in the top (lid), side and bottom walls 20,30, 40 for receiving microwave-oven-generated microwaves.

The rectenna 50 comprises antennas for receiving the microwaves and electric circuitry 80 for converting the received microwaves into direct current.

A microwave shield 60 is integrated in the container walls 20,30, 40 in a separated inner layer for shielding the interior of the container from the microwaves and their heating effect.

Alternatively, the rectenna antennas are integrated outermost in the container walls 20,30, 40. The microwave shield 60 is integrated in an inner layer of the walls as heat protection for both the rectenna circuitry 80, which is integrated in a furthermore inner layer of the walls, and for the purpose of shielding the interior of the container.

An electric cooler or a plurality of such coolers 70 are integrated in an innermost layer of the container side and bottom walls 30,40.

Container incident microwaves are received with the rectenna antennas and are converted to direct current via the rectenna circuitry 80 (shown in an exploded view in fig. 1 and in fig. 3) for powering the electric coolers 70. These coolers 70 thus through the inner side and bottom wall 30,40 surfaces cool the interior of the container 10 and any contents provided therein.

Additionally, coolers can also be integrated in the top (lid) wall 20 for providing cooling through all the inner surfaces of the container walls 20,30, 40.

The rectenna 50 can for example be a diode rectenna or other types of rectennas can alternatively be used.

The rectenna antennas are, according to one embodiment of the invention, dipole, patch or loop antennas or an array of such antennas.

The microwave shield is a metal sheet or metal net with small apertures for shielding microwaves from reaching the interior of the container 10 or it can be of any other microwave reflecting material.

The cooler 70, according to one embodiment of the invention, is a peltier cooling element. Alternatively, any other kind of electrically driven cooling element can be used to cool the interior of the container according to the present invention.

The container is, in one embodiment of the invention, manufactured in aluminum, plastic or ceramic material.

The container is, in another embodiment of the invention, manufactured in a microwave absorbing material.

The container, in a further embodiment of the invention, has rounded forms for avoiding electric arcs by microwave radiation in the microwave oven.

A thermometer or temperature measuring means is, in yet another embodiment of the invention, integrated in the container for displaying the temperature of contents provided therein for cooling. The thermometer can also be provided to display the temperature of the container 10 and/or coolers 70.

A timer means or thermostat provided to a microwave oven could, in yet a further embodiment of the invention, together with a content temperature measuring means, such as a thermometer, accomplish an automatic temperature control of the contents cooled in the container. For example, a blood sample can thus be preset for cooling down to an exact temperature and the microwave oven will then automatically be turned off when the sample reaches that temperature.

Contents for quick and effective cooling in the container 10 by microwaves could for example be beverages such as soft drinks or homemade ice cream, or water can for

example be frozen to provide ice. The container 10 can also be utilized for fast and effective cooling/freezing of food and for cooling/freezing of other substances such as laboratory samples or the like.

The container according to the invention can be utilized for fast and controllable cooling and freezing of most substances and for most purposes. Only the human mind and imagination limit what can be cooled and freezed with the container and method according to the present invention.

In figs. 2 and 3, an example of a rectenna for use in the container 10 according to the present invention is schematically illustrated in a block diagram and a circuit diagram, respectively. The rectenna according to this example comprises an antenna for receiving microwaves, for example generated in a microwave oven. The received microwaves are filtered through a low pass filter, consisting of capacitors C1, C2, C3 and inductors L1, L2, for eliminating undesired ripple. Thereafter the microwaves pass through a rectifying diode D1, for example constituted of one or multiple schottsky-diodes, which generate a direct current. The thus generated direct current passes through a DC (direct current) block filter, which stabilizes the current. A load resistance RL is finally constituted of the coolers or cooling elements connected to the rectenna for being powered by the stabilized direct current for cooling purposes.

In an alternative solution, the rectenna could be used to power a motor integrated in a container for operating a pin, spoon or the like device for automatic stirring of contents in the container by microwaves. For example a soup, which is heated by the microwaves, can thus be simultaneously stirred during the heating.

The rectenna could in another solution be utilized to power and thus heat up a closed or open electric frying pan in a microwave oven. Food can then be fried on the microwave driven pan in the microwave oven, and if the frying pan is open at its top, at the same time be heated from above by the microwaves.

Microwaves in a microwave oven can together with a rectenna also be utilized to charge batteries, for example belonging to cellular phones, PDA's and the like handheld computerized devices having chargeable battery packs.

Means mentioned in the present description can be software means, hardware means or a combination of both.

The present invention has been described with non-limiting examples and embodiments. It is the attached set of claims that describe all possible embodiments for a person skilled in the art.