He also tried desperately to get HP to make it an official HP product. HP wasn't interested.
https://www.bizjournals.com/atlanta/blog/atlantech/2013/01/w...
https://www.bizjournals.com/atlanta/blog/atlantech/2013/01/w...
I think in today's world, he would definitely be sued.
This is in fact one of the ways that an employee can retain rights to an IP or product that is otherwise within the scope of the company's active businesses.