Microwave heating apparatus

Details Microwave heating apparatus Microwave heating apparatus

Filed on

1976-04-27

Date issued

1978-10-17

Examiner

Grimley, Arthur T.

Patent Class

Electric heating

SubClass

Metal heating

SubSubClass

Of cylinders

Other Related Categories

219 1055E, H05B 906

Type

Patent

Status

active

Patent number

041210786

Description

ABSTRACT:
Microwave heating apparatus employing at least one surface waveguide which is provided in a lower portion of the apparatus below an article to be heated receives microwave output, directly or via a tubular waveguide, from an oscillator means, and acts to concentrate microwave energy in a specific region of the apparatus, whereby heating is rendered more efficient and unevenness of heating in the vertical plane is avoided. For improved evenness of heating in the horizontal plane the surface waveguide may be rotated either by separate drive means or by air supplied to cool the oscillator means, or the article to be heated may be rotated or moved reciprocally while the surface waveguide is moving or is stationary. The improved concentration of microwave energy permits greater economy, and offers a particular advantage for producing highly a baked or hardened outer surface without overheating of other portions of an article to be heated.

REFERENCES:
patent: 3478187 (1969-11-01), Agdur et al.
patent: 3626135 (1971-12-01), Fitzmayer
patent: 3810248 (1974-05-01), Risman et al.
patent: 3885118 (1975-05-01), Valtersson
patent: 4019009 (1977-04-01), Kusunoki et al.

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