A quick wiki search and you will see ALL of the items you list have been patented. Once you have a patent you can rent your idea to others. Look up pop top cans. It's amazing how many styles have been tried.
http://en.m.wikipedia.org/wiki/Beverage_can#section_6
Excellently replied, saved me the trouble of saying the same thing.
Let's all not forget: Patents expire. That's why now you can get a reproduction NES/SNES unit made by a Chinese company that plays the cartridges just fine, for hours of retro fun, dirt cheap. So as much as a patent granted may seem like it locks away innovation, in reality all it does is what it is supposed to do: protect the inventor's investment by securing for the inventor a limited period of exclusivity on the sale of that invention.
Now if only copyrights still expired ever...