Since it's a frequent topic of discussion here, it's worth pointing out that Chile is still not bound by the Patent Cooperation Treaty (http://www.uspto.gov/web/offices/pac/dapp/pctstate.html), although they are taking some steps in that direction (http://chile.usembassy.gov/press20090731_mou.html).

If you have a product that you think might be popular enough to run afoul of the U.S. patent mafia, it might be worth consulting with someone versed in Chilean patent law and trying out a launch there instead.