The initial checklist to detect obviousness is the scope and content of prior art, the differences between alleged innovation and prior art, and what constitutes ordinary skill in the art. However, the article linked below discusses secondary considerations.
http://www.the-business-of-patents.com/obviousness.html
1) Commercial success
2) Long-felt but unsolved needs
3) Failure of others
Commercial success points to the market demand for the alleged innovation, which validates both societal need and practicality. If many people are willing to pay for an invention, the invention clearly merits the appreciation and approval of the public.
Long-felt but unsolved needs refer to innovations that make life easier or better by addressing inconveniences and inefficiencies. An outstanding example is the folded cardboard holder for take-out coffees. Before it was invented, people had do deal with excessively hot cups with nothing to shield their hands from the heat. Cup holders were invented so that this unsolved problem could be addressed.
Failure of others refers to previous attempts at addressing some unsolved need. The guiding principle is that a new innovation, if it attempts to do what others failed to do before and benefits society, wouldn't be considered obvious. The problem might have been obvious but the solution was clearly innovative in some way, to distinguish itself from past failures.
https://www.youtube.com/watch?v=YQn32A_UgZY
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