Controversy over the CSIRO patent arose in 2006 after the organisation won an injunction against Buffalo Technology in an infringement suit filed in Federal Court in the Eastern District of Texas. The injunction was subsequently suspended on appeal, with the Court of Appeals for the Federal Circuit finding that the judge in Texas should have allowed a trial to proceed on Buffalo's challenge to the validity of the CSIRO patent. In 2007, CSIRO declined to provide an assurance to the IEEE that it would not sue companies which refused to take a license for use in 802.11n-compliant devices, while at the same time continuing to defend legal challenges to the validity of the patent brought by Intel, Dell, Microsoft, Hewlett-Packard and Netgear.