Contact Patent Office 62988 if your invention is not
obvious.
As summarized in KSR International Co. v.
Teleflex Inc., 550 U.S. 398, 417 (2007):
an unobvious combination must be
"more than the predictable use of prior art elements
according to their established functions".
http://krajec.com/blog Russ Krajec's blog and patent practice