Electric heating – Microwave heating – With control system
Patent
1998-03-02
2000-03-21
Leung, Philip H.
Electric heating
Microwave heating
With control system
711714, 711725, 711502, 116216, 374149, 99325, 426 88, H05B 668, G01K 1112
Patent
active
060405651
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to a vessel, particularly to a vessel having walls of a material which permits heating of the content of the vesssel by radiation, in particular micro-wave radiation.
Such vessels, and the term vessel is used here to include also packages and containers of different kinds which normally, at least partially, have walls of a material which depends on the actual kind of heating. If the heating takes place by heat radiation of the type infrared heat radiation from e.g. a cooking plate, the material may be metal, at least in the bottom. If the heating takes places by means of the nowadays very common heating type using micro-vawes, then the material may be cardboard or plastics or the like. Below, to facilitate, such vessels, along with the instant content in each case, will sometimes be referred to as "object".
Common to all types of heating is the problem of accurately controlling the temperature, e.g. to prevent that the temperature is insufficient for the application in question or to prevent that the vessel as used bursts up and starts leaking due to too a high internal pressure within the vessel, which may happen if the temperature has unintentionally become too high. This problem has been solved, to essential proportions, by the invention that constitutes the subject matter of the patent . . . (Swedish patent application number 95 01942, filed May 24, 1995).
According to the just mentioned patent a solution of the recited problem has been achieved in that the vessel is provided with an information carrier having one or more optically readable control information fields which information carrier is adapted to be used in order to indicate the temperature of the object as the object is heated in an oven. Here, it is conceivable, for instance, to watch visually how the information carrier shifts color as the desired temperature has been reached, so that the heating procedure may be stopped then.
However, the information carrier is preferably adapted to cooperate with an optical reading device of the oven and a control device to control the heating procedure at least partially in dependence of the read temperature information.
According to the invention it is preferred that the information carrier is arranged directly on the heating object, e.g. as a disposable label or, alternatively, as a device for repeated use, which device is applied on the object, its vessel, package or container, e.g. as the heating is performed.
According to the said patent it is preferred that the label or device comprises a field of temperature sensitive color which exhibits a color shift at the desired end temperature of the object, preferably the ready-temperature of a food-stuff or a beverage.
It is conceivable, according to the invention, that the information carrier has the shape of a label or a device for use in an oven having a lighting within the oven cavity, in which case the information carrier preferably is characterized in that the field with temperature sensitive color is composed of two layers, viz. an uppermost layer, which shifts from transparent into non-transparent, or vice versa, at a color shift, and a lowermost layer, which exhibits fluorescense at activation by the oven cavity lighting.
In the patent it has been stated that the invention generally is based on the concept that it is possible to utilize optical reading for the provision of a control system for an oven, which is partially associated with the oven itself, and the technical establishment thereof, and which is partially associated with the object or the food-stuff which should be subjected to heating/preparation, and, further, the realization that such a system, particularly the case with feed-back control, which in known ovens is solely associated with the technical establishment of the oven, may achieve considerable simplifications in the design of the control system of the oven and the general operation of the oven, and that this may be achieved while utilizing cost efficient t
REFERENCES:
patent: 4786773 (1988-11-01), Keefer
patent: 4839485 (1989-06-01), Koch et al.
patent: 4933525 (1990-06-01), Phillips
patent: 5011042 (1991-04-01), Bunce et al.
patent: 5321232 (1994-06-01), Ogle
patent: 5426280 (1995-06-01), Smith
patent: 5504311 (1996-04-01), DuBuis et al.
CD Food Technology AB
Leung Philip H.
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