ADAPTIX is recognized as one of the original developers of OFDMA-based system and has a portfolio of 230 issued and pending patents in 13 countries. The majority of its patents are relative to a wide range of 4G technologies.
It is worth noting, however, that Acacia Research Corporation acquired ADAPTIX in January of 2012. Acacia Research Corporation is known for acquiring patent portfolios and aggressively pursuing litigation, otherwise known as patent trolling.
source: Patently Apple