This is one of those situations where you would be better off asking Ionics first.
If you want to get into legalities about using the logo then they have to produce a certificate of copyright dating when it was registered.
If this is all a bit to much hassle I would adapt thier logo slightly to suit you and then use it. Make sure you adapt it enough to make a variable difference, then register it under copyright and its yours!!
Best wishes,
Trev