Anywhere from 18 to 30 months, typically.

The US Patent and Trademark office reports an average time of 22 months.

It takes time to document the invention properly then find and hire a good patent attorney or patent agent. Having done so, then comes the time necessary to properly explain and fully disclose the concept to the patent practitioner, which sounds more simple in theory than it often is in practice - every invention is different and presumably new!

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