Taken from PCWorld Magazine, February 2012 Edition

Since Intel has trademarked the Ultrabook name, the company isn’t going to let PC makers slap the lable on just any skinny laptop.  A few requirements are involved. According to Intel, a laptop has to meet these five characteristics to qualify for the Ultrabook label.

Quick Startup – Going from hibernate to keyboard interaction must take 7 seconds or less. Resume from sleep should be even faster than that.

Long Battery Life – The minimum for a single charge of the battery is 5 hours, and some models promise up to 8 hours.

Thinness – Ultrabooks need to be less than 21mm (0.82 inch) thick. Most models that have come out so far are much thinner.

Enhanced Security – The laptop firmware has to support Intel’s Anti-Theft and Identity Protection Technology.

Powered by Intel – You didn’t expect Intel to allow AMD CPU’s did you?