Delaware’s federal court on Wednesday joined several district courts across the country in ruling that the U.S. Supreme Court’s TC Heartland decision did not change the law governing where patent infringement cases can be filed, a blow to defendants looking to transfer cases.

U.S. District Judge Gregory M. Sleet of the District of Delaware sided with judges in at least four other districts who have said the landmark ruling did not create new law. Rather, he said, it simply affirmed a 60-year-old Supreme Court decision that held companies reside only in their states of incorporation.