Isn't there a limit to the exclusivity of a filed patent? Only Coca-Cola cheated with perpetual exclusivity.
I think it varies by country. In many jurisdictions it was 17-20 years but depended upon when the patent was granted, protection began etc. I'm not sure if a chess set design is even patentable or if it relies on industrial design or other form of IP. It's a legal minefield. My point is more that it is ok to ask questions on this area. I'm not too sure on all the subtleties either. But to imply that a manufacturers products may be "illegal" is a step too far unless you are fairly sure of your facts and the law surrounding them, particularly when these issues apply to many other sets/producers.
Isn't there a limit to the exclusivity of a filed patent? Only Coca-Cola cheated with perpetual exclusivity.