I was thinking the same thing Dave.
Thank goodness that noone has patented thumstuds for opening folders or pocket clips or generic serrations on the blade or liner locks or heck, even steering wheels for cars.
I mean I can see patenting the size and orientation of the hole for opening and also a small tooth on the spine shaped in a particular way (referring to the Emerson Wave feature) or especially Onion's assisted opening feature. But to patent "using a hole to open a folder" or "an extention of the spine to catch the pocket corner" seems a little excessive.
But hey, I am keenly aware that lots of time and $$ go into research and development of these concepts. If $50 a year is a good deal (I'm not in the market, don't know) then good for Spyderco for allowing the little guy to take a whack.
Anyone have any idea how many other patents there are that cover a wide range of possibilities? Someone mentioned CRKT and Buck... what do they have reserved?