Protonex LLC is a company having several different entities and operating under similar names, has lead to some confusion. Most prominent current entity seems to be PNI Sensor, - specializing in positioning and navigation sensors, particularly for military applications. Firm also associated with a previous company -- Protonex Technology Corporation -- which was a leader in fuel cell technology before its assets were sold to other companies. Finally, the name has been associated with a separate, now-bankrupt California-based entity that was involved in semiconductor manufacturing.
