State Street Bank & Trust Co. v. Signature Financial Group, Inc.

Signature Financial Group (defendant) patented a 'Hub and Spoke' data-processing system using computer calculations to transform discrete public share prices into a final mutual-fund share value; after licensing negotiations with State Street Bank (plaintiff) collapsed, State Street sought a declaratory judgment that the patent was invalid, and the district court granted partial summary judgment finding the patent's claims did not cover statutory patentable subject matter. Signature appealed.