Electric heating – Microwave heating – Radiation protection
Patent
1996-12-27
1998-05-12
Leung, Philip H.
Electric heating
Microwave heating
Radiation protection
219743, 174 35GC, H05B 676
Patent
active
057509697
ABSTRACT:
A microwave choke apparatus for a microwave oven includes an inner door panel having a plurality of multi-pronged and double-stepped portions extended outwardly therefrom, between which multi-pronged and double-stepped toothed portions there are alternately formed a plurality of slots, an outer door panel having an upwardly bent portion at an outer periphery thereof, and a choke cover for closing an opening formed between an inner side of the bent portion of the outer door panel and respective outer flat portions of the multi-pronged and double-stepped toothed portions of the inner door panel. The apparatus effectively prevents microwaves from leaking externally through a gap between a door frame and a front panel of the microwave oven by broadening a bandwidth of a choke resonant frequency of a choke channel.
REFERENCES:
patent: 3668357 (1972-06-01), Kobayashi
patent: 3767884 (1973-10-01), Osepchuk et al.
patent: 4700034 (1987-10-01), Lee
patent: 5036171 (1991-07-01), Kim et al.
patent: 5206478 (1993-04-01), Lee
Leung Philip H.
LG Electronics Inc.
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