Would you search the internet for plates for keeping food hot? I was making a big mistake; nobody thinks that's possible, ok, then lets call them plates for keeping food warm.
HotSmart plates remain still hot after 30 minutes, need just one minute preheating in a full size microwave oven (1200 Watts) and can even be handled safely with the bare hands by the rim which does not get hot.
See also: http://www.EatSlowlySite.com
Patients with Lou Gehrig's disease (ALS) or weight loss surgery (WLS) can use them to keep food warm.