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Well, actually patenting is a whole different story. You can only patent a color if it does something. In theory you could possibly patent yellow on a life jacket because it makes you more visible and more likely to be rescued. But patents eventually expire and then other companies can use the idea for free.
Trademarks never expire as long as you are still in business and still using and enforcing your trademark.
Copyrights are supposed to expire, but every time Mickey Mouse is about to go into the public domain, Disney bribes Congress to extend the expiration date of copyrights. So in effect, copyrights never expire either.
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