"Heat retentive plates" as they were originally called by the inventor (Another name was "Heat storage dish) were developed and patented by Juan J. Ramirez an Industrial Engineer from El Paso Texas after surviving a stroke and brain tumor operation that forced him to abandon his career in manufacturing.
The inventor offered the license to several companies in the USA who rejected the project; a few were very interested but they practically wanted to steal the idea. The invention is patented in the USA and patent pending in China and other countries.
The plates have just hit the market through Amazon.com as "InstaHot 30 min plus" Hotsmart plates.The name describes the product well but there is lots of information on the internet about the "Hotsmart project", the plates can even help people lose weight by eating slowly.
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About Hotsmart: Officially established in El Paso TX in April 2009 as retail seller through the internet, Hotsmart is teaching the Chinese to manufacture its patented products which are being introduced to the USA market through amazon.com; HotSmart plans are to export to other countries from China. Some buyers are interested since early designs were shown at the Hong Kong fair in 2008.