On November 9 2009, the Supreme Court heard oral argument in In re Bilski, a case that will likely impact whether business methods, already patented and to be patented, are eligible for patent protection under US law. Patent-eligibility under section 101 of the US patent code is one of several hurdles to patentability, and requires that an invention be a "new and useful process, machine, manufacture, or composition of matter". Not all processes are patent-eligible. Although the Supreme Court has not yet precisely defined what is required of a process to be eligible, it has identified what is not eligible for patenting – laws of nature, natural phenomena, and abstract ideas (the Diehr test).