When I first began promoting the Spyderco Clipits in Europe (circa 1986), they were referred to as: "self opening knives" and "new fashion knives". Europe was still into the stag handled folders and fixed blades. They weren't "Tactical" folding knives until; Bob Terzuola, Kit Carson, Blackie Collins and Pat Crawford began to focus on the genre. The US Custom knifemakers Guild was quite influential in that area in the mid to late 80's.
I think much of our innovation was due to our "cowboy" attitude as the Europeans referred to often.
I would have to add Blackie Collins to your list. Our patent office says that until the late 70's / early 80's, the patents on knives had been relatively dormant. The new Renaissance, according to them, began with the Collins "Bolt-Action" patent and the Glesser "Clipit" patent. (The "kids" of the 50's grew up )
Then the patents on knives began to increase greatly.
The American innovation in knives that has emerged in the past 30 years is surprising. (There are so many lock ideas that Spyderco is making a model that will recognize folding knife lock innovation).