568 U.S. 251 (2013) Cited 2,722 times 40 Legal Analyses
Holding insubstantial the federal question whether patent lawyers being sued for malpractice could have succeeded in a prior federal patent suit by timely raising a particular argument, because "[n]o matter how the state courts resolve that hypothetical ‘case within a case,’ it w[ould] not change the real-world result of the prior federal patent litigation. [Plaintiff's] patent w[ould] remain invalid."