US 4,297,557 AGranted

Microwave oven temperature indicator and control means

AssigneeRobertshaw Controls Company

InventorsHugh J. Tyler, William H. Conway

Life of this patent

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Abstract

There is disclosed a telemetric temperature probe for telemetry of temperatures of comestibles which are heated within microwave ovens. The probe includes a temperature responsive circuit for generating a signal responsive to the temperature of the comestible and an electromagnetic wave broadcasting circuit for telemetric transmission of the signal to a remote receiver which can conveniently be incorporated in the microwave oven and coupled to its control circuit. The probe is provided with facilities to derive power necessary for its operation from the microwave energy generated by the oven and includes, for this purpose, an antenna to receive microwave energy, a rectifier circuit for developing direct current power therefrom and a voltage regulation circuit to produce a source of direct current of controlled voltage for operation of the temperature responsive circuit and the broadcasting circuit.

Claims6

Dependent claims

The combination of a microwave oven and telemetric temperature probe therefor which comprises:

(a) a microwave oven housing having internal walls defining and providing microwave shielding about an oven cavity;
(b) a telemetric temperature probe including:
(b.sub.1) microwave antenna means and power supply circuit means in circuit therewith to generate a power supply from received microwave radiation;
(b.sub.2) temperature responsive oscillator circuit mean driven by said power supply means to generate an oscillatory signal temperature modulated frequency and of a frequency distinct from said microwave frequency;
(b.sub.3) electromagnetic wave transmission means to broadcast said oscillatory signal;
and
(b.sub.4) a probe housing having shielding means surrounding said power supply circuit means, oscillator circuit means and wave transmission means and of selective permeability to limit transmission of microwave energy while permitting transmission of said broadcast oscillatory signal;
(c) signal receiver means mounted in said oven to receive said broadcast oscillatory signal;
and
(d) shielding means, of selective permeability to limit transmission of microwave energy while permitting transmission of said broadcast oscillatory signal, in said oven and surrounding said signal receiver means.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/682,198Filed 3 May 1976
Granted: 27 Oct 1981
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

H05B 6/6467
Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors: using detectors with R.F. transmitters
A47J 36/027
Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay: cooking- or baking-vessels specially adapted for…
A47J 36/32
Parts, details or accessories of cooking-vessels: time-controlled igniting mechanisms or alarm devices
F24C 7/02
Stoves or ranges heated by electric energy: using microwaves