Electric heating – Microwave heating – Radiation protection
Patent
1996-12-13
1999-11-09
Leung, Philip H.
Electric heating
Microwave heating
Radiation protection
219744, 126198, 174 35MS, H05B 676
Patent
active
059819278
ABSTRACT:
A microwave oven comprises a cabinet and a door attached to the cabinet to form a food processing chamber. The door has a screen, an absorbing film, and a frame. The screen reflects microwave energy away from the absorbing film, the screen has a plurality of screen lines and a plurality of screen openings defined by the plurality of screen lines, and the screen has a screen period. The absorbing film absorbs microwave energy passing through the screen. The frame supports the screen and the absorbing film in order to form a window through the door and to maintain leakage of microwave energy through the door from the food processing chamber below a predetermined level. The frame supports the screen and the absorbing film so that the screen and the absorbing film are separated by a distance which is as least as great as the screen period, and the screen and the absorbing film are electrically attached to the frame.
REFERENCES:
patent: 2920174 (1960-01-01), Haagensen
patent: 4695694 (1987-09-01), Hill et al.
patent: 4745247 (1988-05-01), Fukumoto
TECHNIT, Data Sheet EMC-710, Copyright 1972 Technical Wire Products, Inc.
UK Search Report, dated Apr. 16, 1998, Application No. GB 9726489.9.
Fritts Rex E.
Miller Thomas L.
Osepchuk John
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