In that case (Sakraida 1976), the Court held that a combination which only unites old elements with no change in their respective functions is precluded from patentability under 103(a).
http://www.patentlyo.com/patent/2006/10/ksr_v_teleflex_.html
因此，各舊元件的組合，必須是舊元件都有了新的功能，才能具有進步性。
