io9+ reports: [edited]
The vessel is the brainchild of Logan Maxwell and Dean Verhoeven. Together, the pair founded a company – Joeveo – and launched a Kickstarter for their mug, which they call the "Temperfect."
Maxwell tells io9 the Temperfect mug is engineered to bring scalding beverages to a hot-but-drinkable temperature and keep it there.The Temperfect is designed to bring coffee or tea (which are typically brewed at around 200 °F) to an ideal drinking temperature in about two minutes, and keep it there for hours on end.
Your conventional insulated mug prevents heat loss by sandwiching a vacuum between two walls. The Temperfect works in a similar fashion, but adds a third wall to the mix. Like a regular thermos, the Temperfect has a vacuum between its outer and middle walls, but between its middle and inner walls is a non-toxic chemical that Maxwell calls "Material X".
At room temperature, Material X is a solid, but pour a hot beverage into the mug and it quickly absorbs any excess heat, becoming a liquid while rapidly dropping the temperature of your brew. The excess heat is stored in Material X, and dissipates back into the coffee as it cools. The so-called "phase change" mug resembles similar prototypes first cooked up in the 1960s that never made it to market due to manufacturing hangups.