Hi Yablanowitz,
Thanx for the explanation. It's that "going broke" part that most don't realize. There is no "patent police", only the lawyers.
BTW, knives of Alaska has been using their "finger hole" on their fixed blade for quite some time.
Hi ClintB,
It is quite difficult to come up with a concept, produce it, promote the hell out of it, fight to keep it and watch others run with it. It is frustrting for an inventor / designer to spend years developing and producing a concept only to have others receive the benefit.
It does often influence those to stop creating.
Spyderco also invented the pocket clip that is probably on your knife. Just about every knife company in the world has used that one. I can pat myself on the back and say "well done", but I can't pat my crew and vendors on the back, I have to pay them.
Spyderco does in fact have a trademark on the useage of a round hole at a certain location on the blade of a folding knife. I don't think there is any question about the origin, regardless of patents or trademarks.
We are putting that trademark round hole on the blade of every knife we make, folders and fixed blades, and on the handle of every balisong we make.
Regarding "the wheel", it is my belief tha one person invented / designed that as well (Mr. Wheel

) No doubt before patents and trademarks were "invented".
sal