First off Let me say that if you want to know more about INFI, go to the busse forum, do some searches, if you still have some questions i am sure that they can answer them, the strider Forum really isnt the right place for a in depth disscussion of INFI.
Yes Busse is the only company that uses INFI, it is probably mixed up by Jerry Busse is his back yard from the springs of old chevy trucks, he most likely melts them down in a coleman gas fired grill, says the proper incantation then adds the secret ingredient "CHEMICAL X" i would guess that INFI is mixed up best on the night of a full moon.
To get a Strider made from INFI would most likely require some sort of arranged marriage between the Busse and strider families, and those types of things are no longer in style these days (at least in the US).
Let me just say that i am sure that Strider knives would not use any steel or heat treat that wouldnt get the job done.
Let's let this thread die.