"(4) Bilski v. Doll: A decision that revisits earlier decisions on patent standards in which the Federal Circuit limited patentability to inventions (1) tied to a particular machine or (2) that transform an “article” into a different state or thing. The court also confirmed previous cases holding that fundamental principles of mathematics or science are not patentable. But, since the claims in Bilski were not tied to particular hardware, the court did not consider the viability of patenting specific functions carried out by a computer. Now, how the phrase “tied to a particular machine” will be applied to software patents."
Source: http://www.patentbaristas.com/archives/2009/01/06/wegners-top-ten-patent-cases-in-2009/


