Phase shift device for microwave oven door seal

Details Phase shift device for microwave oven door seal Phase shift device for microwave oven door seal

1977-09-22

1978-10-24

Grimley, Arthur T.

Electric heating

Metal heating

Of cylinders

219 1055F, H05B 906

Patent

active

041223233

ABSTRACT:
A pair of phase shift devices is provided for sealing a microwave oven against the leakage of microwave energy. Each phase shift device is in the form of a conductive channel member having sides of unequal width. The narrower channel side is positioned parallel to and slightly spaced from an inner surface of the door to define a capacitive gap therebetween. The wider channel side extends perpendicularly outwardly from one of the cavity walls and is effectively electrically connected thereto at the microwave frequency. The devices are particularly adapted to be used in combination with a metal mesh gasket seal and, when so used, not only serve as a backup for the metal mesh gasket but also reduce the likelihood of gasket failure. The nature of the phase shift device permits it to be easily retrofitted to a microwave oven already in service.

REFERENCES:
patent: 3304401 (1967-02-01), Long
patent: 3629537 (1971-12-01), Haagensen
patent: 3812316 (1974-05-01), Milburn
patent: 3846608 (1974-11-01), Vera Valles
patent: 4013861 (1977-03-01), Westfall
patent: 4053731 (1977-10-01), Foerstner
patent: 4059742 (1977-11-01), Baron

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