A frustration I've had in the past when conducting patent searches was that regular search only went so far. This is due to a number of reasons, such as patents being poorly translated from other languages, or due to intentionally broad and non-specific language being used to broaden the scope of the patent.
However, I often noticed that the patent drawings were usually quite accurate, often times either being drawn by a professional, or by using commercial CAD software. I then wanted to try to implement reverse image search to identify similar patents by searching using prior art.