An engineer with no connection to the self-driving industry has spent $6,000 of his own money to stop Alphabet's self-driving car business Waymo from patenting key technology. Following a challenge filed by Eric Swildens, the US Patent and Trademark Office (USPTO) rejected 53 out of 56 claims in Waymo's 936 patent. He just "couldn't imagine the [lidar] circuit [described in the 936 patent] didn't exist prior," Ars Technica reported. Filed in 2013 and granted in 2016, the 936 patent was a cornerstone of Waymo's lawsuit against Uber, which began in December 2016. In a nutshell, Waymo accused the ride-hailing giant of infringing its lidar design patent and using intellectual property allegedly stolen by engineer Anthony Levandowski.