“Section 112 of the Patent Act provides that a patent’s ‘specification shall contain a written description of the invention, and of the manner and process of making and using it,’ sufficient ‘to enable any person skilled in the art . . . to make and use the’ invention. 35 U.S.C. § 112(a). The requirement that the specification teach skilled artisans ‘to make and use’ the invention is referred to as the ‘enablement’ requirement. Markman v. Westview Instruments, Inc., 517 U.S. 370, 379 (1996). The questions presented are:”