Apple had originally applied for the Thunderbolt trademark in Canada and the U.S. generating some questions about the ownership of the trademark, and the ability for 3rd parties to use the term."As part of our collaboration with Apple, they did some of the initial trademark filings. Intel has full rights to the Thunderbolt trademark now and into the future. The Thunderbolt name will be used going forward on all platforms, irrespective of operating system."
Article Link: Intel Does Own the Thunderbolt Trademark, Not Apple