For many student and other early-stage projects, the goal is of a patent search to find out what already exists or is currently being developed. This "state-of-the art" type search typically does NOT give enough information to know if a particular idea is patentable or infringes on an existing patent, but it does give information about what has been tried already and how similar an idea is to what has been patented.
If you're getting too many results or too many irrelevant results, you probably should narrow your search down to just inventions that are in the same category as yours. Use the Cooperative Patent Classification system to find the classification for your invention, and then narrow down your search from there.
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