I quickly read the "Stoly" case (Fed. Treasury Enter. Sojuzplodoimport v. Spirits Int'l N.V., No. 06-3532-cv (2d Cir. Oct. 8, 2010)) when it came a little over a week ago but didn't write anything because I figured it was such a unique and complicated set of facts that, who cares?, really. But a colleague spurred me into more closely re-reading it, and I now see two larger legal points here.
First, where an incontestable registration has later been assigned, a challenge to the assignment is not precluded by section 1115(b)'s provision that incontestability is "conclusive evidence of . . . registrant's ownership of the mark" because where there's a dispute as to the validity of an assignment, an assignee is not necessarily the registrant. And where an assignee's rights are at issue, the recordation of the assignment at the PTO is only "prima facie evidence of execution" of the assignment. Thus, to tap into the "conclusive evidence of ownership" provided by incontestability, an assignee whose assignment is challenged must first prove up a valid assignment.
Second, while the "antecedent question" of the validity of the assignment might be a question of state or even foreign law, federal courts have jurisdiction to hear disputes as to the validity of assignment of a federal registration under the Lanham Act if the challenger specifically seeks any of the remedies provided by the Act.