Science You Can Use: Engineer Designs Mug to Keep Coffee Temperature Just Right

12.11.2013 |

Dean Verhoeven (left) and Logan Maxwell (right). Maxwell began tinkering with ideas for the Temperfect mug (in his hand) as an undergrad at NC State.

Dean Verhoeven (left) and Logan Maxwell (right). Maxwell began tinkering with ideas for the Temperfect mug (in his hand) as an undergrad at NC State.

Some people think that university researchers are so occupied with their laboratories that they’ve lost sight of the world outside the ivory tower of academia. I would refer those people to Logan Maxwell, a researcher at NC State who has developed a coffee mug that will keep your coffee hot – but not too hot – for hours at a time. And what could be more practical than that?

“Our goal was to create a coffee mug that will take piping hot coffee and cool it to a hot, but drinkable, temperature – and keep it at that temperature for a long time,” says Logan Maxwell, a research assistant at NC State and co-founder of Joeveo, the company that makes the “Temperfect” mug.

Maxwell came up with the idea as an undergraduate at NC State (he graduated in May 2013), and developed his first prototypes as part of his senior design project. The idea is fairly simple.

The Temperfect is an insulated mug with three walls. Between the outer and middle walls is a vacuum, like a conventional insulated mug. But between the middle wall and the inner wall of the mug is a non-toxic chemical that we’ll call “Material X.” Material X is useful for putting into coffee mugs because it “melts” at 140 degrees Fahrenheit.

At room temperature, Material X is a solid. But when you pour hot coffee into the mug, the heat dissipates through the stainless steel inner wall of the mug and is absorbed by Material X, which becomes a liquid. This pulls the temperature of the coffee down to 140 degrees F. As the coffee cools, Material X releases its heat back through the lining of the mug – keeping the coffee hot.

“I did some research and found that most coffee is served at between 200 F and 185 F, and that coffee can burn you at any temperature above 140 F,” Maxwell says. “So we set our ‘ideal’ temperature at 140 F.”

The concept of a “phase-change” coffee mug to keep beverages warm was patented in the 1960s, but never made it to the marketplace due to manufacturing difficulties. But Maxwell happened to meet an engineer named Dean Verhoeven who had already solved the manufacturing problem and done extensive design work of his own. Dean and Maxwell teamed up and Joeveo was born.

The two recently launched a Kickstarter campaign to finance an initial production run of Temperfect mugs, and reached their funding goal in less than two weeks. However, anyone interested in supporting the project (and getting one of the first mugs) can donate before Jan. 1, 2014.

“NC State’s senior design project pushed me to think entrepreneurially, and that was the impetus for the Temperfect mug,” Maxwell says. “Without that push from NC State, and the support I got from my professors, I would have never started the project, never met Dean, and this never would have happened for me.”

Editor’s Note: It makes sense that scientists would be thinking about coffee. After all, a 2011 poll found that researchers drink more coffee than any other profession.



6 Responses to “Science You Can Use: Engineer Designs Mug to Keep Coffee Temperature Just Right”

  1. How brilliant!?! I must have one. Nice work!

  2. Trish Cromer says:

    I MUST have one for my husband, I know people DRINK coffee but, my husband LIVES for/on coffee. Have you seen uncle Si with his tea cup well this is my husband with his coffee cup, please tell me when or how I can get one of these cups. By the way, GREAT idea keep up the good work.

    Thanks,
    Trish Cromer, NC

  3. Hello
    I like to purchse your coffe cup. Where can I get it ?.

  4. Where can I buy one?

  5. […] mug? A cup that holds coffee at just the right temperature. Matt Shipman on a hot […]

  6. Hi everyone! It’s Logan from the article. If you would like to purchase a mug you can pre-order one here:

    http://www.kickstarter.com/projects/deandavidv/the-temperfect-mug-coffee-and-tea-at-the-perfect-t

    Use the grey buttons on the right side of the page to pick which mug you want and we will get it to you as soon as we can after our initial production run this Spring!

Leave a Reply