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[Phys-L] Why didn't I think this. (mirror dispersal of microwave energy[1])

Costco advertises an oven with “concave reflection technology” which claims to heat the object uniformly. After an unconscionably long time, I found the technology description. Instead of a rotating platform or a fan, the oven uses (a) concave mirror(s). Here’s the patent:

bc intends to purchase the Daewoo oven from Costco (only $65 delivered)

p.s. Our current oven stratifies the energy, so one must stir the coffee otherwise the top burns and the bottom is cool. If it were inverted ….

[1] Especially since I've shown and told (at AAPT section and SCPTA meetings ) microwave optics.