There is one. It is complicated. The easiest way to prove obviousness is to find printed publications that describe the claimed invention. For obviousness, mul

There is one. It is complicated. The easiest way to prove obviousness is to find printed publications that describe the claimed invention. For obviousness, multiple printed publications can be combined as long as they are in a related field and there would be some kind of motivation for one of ordinary skill in the art to combine what they disclose.