Some are more obvious than others. I think that is a major problem with patents - all inventions are treated the same. However there is a big difference betwee

Some are more obvious than others. I think that is a major problem with patents - all inventions are treated the same. However there is a big difference between something reasonably new that took a decade of r&d work to get right and a tiny change to an existing invention which took a day and is an obvious logical progession from what came before which everyone would have came up with.