Ask Will Toledo.

Yes.*

You can patent a design pattern, within a specific context (provided the patent is approved)

NAMCO infamously patented ‘Loaing Screen Games’, with its documented example being Galaga.

Thankfully that patent expired in 2015. Hope this answers your question!

Fleabag

Robert “Uncle Bob” Martin, author of several foundational texts, and coauthor of the agile manifesto provides one, which I think is good: https://blog.cleancoder.com/uncle-bob/2015/11/18/TheProgrammersOath.html