Electric heating – Metal heating – Of cylinders
Patent
1977-05-10
1979-01-30
Grimley, Arthur T.
Electric heating
Metal heating
Of cylinders
H05B 906
Patent
active
041374410
ABSTRACT:
A microwave oven having a door with a peripheral microwave seal structure which is fabricated from one or more die formed aluminum parts and solid dielectric inserts to form a resonant transmission line structure with peripheral oven wall portions, with transmission of microwave energy in the seal around the periphery of the door prevented by impedance discontinuities, and leakage of microwave energy through the seal is prevented by impedance mismatch or resonant choke action of the seal structure, and the size of a notch in a solid dielectric insert in a quarter wavelength shorted branch line of the seal is selected for different production runs of the oven to compensate for dimensional changes in different die stamped metal parts or assembled door structures due to assembly jig changes, stamping die wear or assembly procedures.
REFERENCES:
patent: 3668357 (1972-06-01), Kobayashi
patent: 3767884 (1973-10-01), Osepchuk et al.
patent: 4053731 (1977-10-01), Foerstner
Amana Refrigeration Inc.
Arnold H. W.
Bartlett M. D.
Grimley Arthur T.
Pannone J. D.
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