In Net MoneyIN, Inc. v. VeriSign, Inc., 545 F.3d 1359 (Fed.Cir.2008), the Court addressed a patentee's argument that reference to a computer provides sufficient structure for a claim drafted in means-plus-function form. In Net MoneyIN, the computer was not a general purpose computer; the patentee contended that the reference to a "bank computer" provided sufficient structure to support the function of "generating an authorization indicia in response to queries containing a customer account number and amount." Id. at 1365. The patentee argued that "a person skilled in the art would know that such a computer would be programmed to compare account data and amount data to those data structures and generate an authorization indicia if credit were available." Id. at 1366-67. The Court rejected that argument and explained that when a computer is referenced as support for a function in a means-plus-function claim, there must be some explanation of how the computer performs the claimed function: To avoid purely functional claiming in cases involving computer-implemented inventions, we have consistently required that the structure disclosed in the specification be more than simply a general purpose computer or microprocessor. Because general purpose computers can be programmed to perform very different tasks in very different ways, simply disclosing a computer as the structure designated to perform a particular function does not limit the scope of the claim to the corresponding structure, material, or acts that perform the function, as required by section 112 paragraph 6. Thus, in a means-plus-function claim in which the disclosed structure is a computer, or microprocessor, programmed to carry out an algorithm, the disclosed structure is not the general purpose computer, but rather the special purpose computer programmed to perform the disclosed algorithm. Consequently, a means-plus-function claim element for which the only disclosed structure is a general purpose computer is invalid if the specification fails to disclose an algorithm for performing the claimed function. Id. at 1367. Because there was no disclosed algorithm in that case, the Court held that the claims were invalid for lack of a sufficient recitation of structure. Id.