Apple has joined the growing list of companies opposing Motorola Mobility's request to ban imports of Xbox 360s to the US and cease sales of the console.
Along with Apple, Nokia, Intel, HP and Cisco have contacted the International Trade Commission asking it not to rule in Motorola's favour.
Motorola claims the Xbox 360 infringes on five of the telecommunications company's patents related to "secure wireless communication and transmission of video content between controller devices and game consoles".
In April an ITC judge agreed that Microsoft's hardware violates four Motorola patents and recommended that the commission ban the 4GB and 250GB versions of the Xbox console. However, a final decision is still pending.
Mark Davis, an attorney representing Apple, wrote to the ITC saying that Motorola initially committed to license patents under fair, reasonable, and non-discriminatory terms (FRAND), but is now ignoring those requirements to sue Microsoft.
"Apple respectfully submits that any exclusion order directed against Microsoft would significantly undermine the standards-setting process and frustrate the purpose of FRAND," said Davis.
Yesterday Activision Blizzard also lined up behind Microsoft.