A major shareholder and his buddy tried to steal it away from CLYW with a phony lawsuit that went uncontested. Luckily for SH, it still belongs to CLYW, and even this is still unclear until the settlement agreement is made public.
From what I remember reading, when RIM (Blackberry) got sued for patent infringement, the company that held the patent didn't have any working product, just the idea of e-mail on a wireless device.