Really? There was nothing patentable about the locking mechanism on the tang or the internal arrangement of the spring and lock-release mechanism? I guess I'm surprised to hear that.
I have to agree with RX above.
There may have been something there, but even so, Schrade (or any of the companies that have made numerous 110 "copies,") could make a slightly different internal design and call it their own. Regardless, there was really nothing to be done about how the visible parts of the knife looked, I believe.
I'm by no means a Buck expert of spokesperson, but I feel that if they could have patented any sort of internal arrangement of the knife, they just wouldn't have seen it as "worth it." I wouldn't, but I'm not a knifemaker.