Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Why is Ask Patents not present in the above grid?
Because patents.SE is still in Private Beta.
Sites will be listed there once they enter Public Beta.
(Sadly I'm having more trouble than expected finding canonical references for this though.)
Looks like it's there now:
6 years ago
2 years ago