If it makes you feel better, you’d be over a decade late for patenting it. I had one when I graduated high school. (they’re also sold as “candle warmers” for when you want the scent of a candle without burning it)
The alternate is a small warmer that shuts off…
A) when it just sits too long and
B) when you pick up the cup. It has a small magnet in the bottom that operates a switch.
My boss had one of these in the early 80′s.
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