But, Essential's Phone beat Keyssa to the punch by launching with a magnetic connector for modular parts and wireless data transfers in September. Keyssa claims Essential held design and tech talks with it for 10 months, before dumping it in favor of its rival SiBEAM's chip in November 2016. The lawsuit alleges that the Essential Phone carries many of the wireless connector elements Keyssa developed specifically for handsets -- from antenna designs to methods of testing phones during production. Keyssa said it's been working on its tech since 2009, and signed a non-disclosure agreement blocking Essential from using its feature. Now, it's taking the matter to a San Francisco federal court.

Essential's path to its debut smartphone has been a bumpy one, plagued by delays, privacy blunders, and trademark disputes. Just when it thought it was in the clear, it's staring down yet another obstacle.