See Dave Keck's PPT presentation of 2014. May give some insight as to where GT is going.(page 11) http://files.shareholder.com/downloads/AMDA-1AHIQM/3056099923x0x734196/f59c2b85-2224-4c4d-8368-ae5d63f19365/GT%20Advanced%20Technologies%20New%20Product%20and%20Technology%20Briefing.pdf