In order to get a patent, the design must be orignal or it has to be a combination of ideas that become original.
Like the 1 piece ferrule tip. A ferrule or a tip on it's own is not original, but combing the two is.
When a patent search is done, it goes back to the earlyist known patents. In the case of a cue tip patent that could be as far back as 1857 or when the first patent of that feature or similar feature was lodged.
Copyright is different and pertains to a specific design or logo or statement. Most music is copyright, and last for about 40 or 50 years, not sure on the exact time frame.
But a patent must be continually paid for , otherwise it will expire. When it is expired, then it becomes public domain.
However, some patents expire , but is continued on in an other patent number, as new features are developed or discovered.
As for cues and the makers having a patent to be valuable, is like saying a car is not woth 23000 because they do not have a patent on it. The patent is really nothing to do with the price.
The price comes from fair market value, or from what the particular cuemakers time and resources to create the cue for that person.
Ultimatley the price is what some one is prepared to pay. But when you want a particular item and it is only available from X supplier, then X suppliers price is the value of the product.
In Patrick's line about seeing something and it being patented years later, take the example of none standard spaced fluted reamers. Many toolmakers like myself made these for more years than can be recalled. Only they were not available comercially. And now will not be , as Boeing recently got a patent on none evenly spaced fluted reamers. Even though they were made by many people through out the world, Boeing now has a patent which prevents myself from selling such an item.
Hope this helps, Neil,
Ps if you paid $15000 for your cue and you like it, and no one else in the world has a cue that is like your cue, I would think that if you refused to sell it for less than you paid for it, it would still be worth $15000.