IPTE = International Premium Travel Experience. It was a program done around 2009 which introduced new cabins for the pmUA 747, 767, and 777 fleets. ITPE has been mostly eliminated now with the introduction of Polaris and modern Y cabins and the only remnant of it exists with the 772HD F cabin.

More info UAL's IPTE (International Premium Travel Experience) - New C and F Cabins Update