“ The injunction was asked for only as an incident of a finding that the title was vested in the complainant. 'The bill . . . must be regarded and treated as a proceeding to enforce the specific execution of the contracts referred to and not as one to protect the complainants in the exclusive enjoyment of a patent right. . . . It is to prevent the fraudulent violation of these contracts, therefore, that the complainant seeks the aid of the court and asks for an injunction.' Brown v. ”