Stack Exchange network consists of 177 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
I couldn't find any option to subscribe to the newsletter and even in the dashboard, where all sites are listed, subscribing "ask patents" is not possible.
Why is that?
Newsletters have been renamed to community digests. You can subscribe to them on SE.com. You can also get there via your email settings.