In Re Bilski (2007-1130)
Previously, a process was considered directed to patent-eligible subject matter if the process provided a useful, concrete and tangible result. Now, however, that is not enough. Instead, the process must be tied to a particular machine or apparatus, or, alternatively transform a particular article into a different state or thing. Moreover, the use of a specific machine or transformation of an article must impose meaningful limits to impart patent-eligibility. Also, the involvement of the machine or transformation must not merely be insignificant extra-solution activity.