Mobile payments startup Square’s origins have been thrown into dispute after a Washington University in St. Louis professor has filed a law suit alleging fraud patent infringement.

Professor Robert E. Morley has alleged that Square’s founders, Twitter chairman and co-founder Jack Dorsey and James McKelvey, froze Morley out from the business.

The complaint reads: “The business now known as Square was not created solely by Jack Dorsey and James McKelvey. It was Professor Robert Morley – and Dr. Morley alone…