It's also interesting that they seem to be somewhat oblivious of the US demand. At least it seemed like that. My guess is that they could have sold one of the machines to a US based entrepreneur. I can pretty much envision somone making that chalk in a garage and selling it to universities/individuals.
I also think that it's somewhat short sighted to assume procurement by the employer is needed. Especially in "brainy" jobs it's pretty common for people to be willing to spend their own money for tools they use on the job. If my school only provides chalk X I'm pretty much willing to spend some of my own money for the better chalk if I can't change their mind.
Maybe they were just "too big" and targeting a commodity market instead of going for the smaller premium market.