GT probably has the stronger case seeing as the ex CTO of Crystal Systems went to work for Arc after spending many years at Crystal Systems and subsequently GTAT. The ex CTO of Crystal Systems and the CEO of Arc went to school together...SUNY...I believe so they go back a long ways. GT had originally licenced the HEM technology from Crystal Systems for Silicon PV applications while CS kept it for Sapphire applications.
If you look up Chandra Khattak and sapphire patents there must be close to 12 + with his name...maybe 20 +.
GT tended to use law suits as an offensive strategy. It kept the small guys tied up in litigation vs. marketing and sales growth. Probably not frivolous but enough to slow them down.
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