I wholeheartedly support a correctly implemented patent system in industrialized nations. Although not all inventions fall into this particular category (and we can go on and on all day about those that don't), a number of very valuable inventions require massive investments of time and money to develop and perfect. Without any assurance of the ability to recover for these investments, people would be hard-pressed to engage in them in the first place. Think, most obviously, pharmaceuticals.
A uniform patent system would require poorer countries to adhere to patent norms that would be inherently contrary to their own interests. If you have nothing to protect, and it is absolutely to your advantage to take, why should you be forced to follow along? It makes no sense to ask developing nations and others with no need for a patent system to obey the restrictions earned elsewhere. And, here's the important thing, these two completely different levels of protection can in fact peacefully co-exist. The market will correct. If a poorer country absolutely needs a particular drug developed which no other country needs, maybe then they would find use in patent or patent-like protections. Until then, it's silly to impose our will on others.