Ask HN: How do I know if my startup is infringing on patents?
With all of the patents out there, what is the best way to figure out which features I've added might infringe on a patent/idea I've never heard of?
Of course when in doubt an attorney has his/her usages. Also others here may have better or more experience.
But for the vast majority of startups, this is not something you should be worrying about early on. Let the lawyers sort it out later during due diligence. Worry about getting customers first. You should consult your legal counsel (rather than the internet) about your specific case, but in general...build the damn thing and start selling it, instead of looking for excuses not to.