Eight to fifteen thousand dollars. That is what a patent attorney runs for a basic utility patent, before the USPTO's own fees, which add maybe $1,800 for a small outfit. Software or biotech? Throw that range out. You are at $15,000 to $30,000, and I have seen plenty climb past it.
People wince at the attorney number and shrug at the government one. They have it backwards. Here is why.
Key takeaway: you are not buying a document. You are buying claims, the handful of sentences that decide exactly what your patent owns, written to survive an examiner and hold up when a competitor comes knocking.
Where the money goes
Almost all of it is drafting. The attorney has to understand your invention, write it up, then write the claims. The claims are everything. Too narrow and a rival walks around them by Tuesday. Too broad and the examiner throws them out. Threading that needle is the whole job, and it is why experience is not cheap.
What runs it up
The field, more than anything. A simple gadget is one price. A software method, more. A drug formulation, more again. After that it is the count of claims, and the office actions, the examiner's written rejections, which you will trade letters over for two or three years before anything gets granted. Every round is more hours on the clock.
Attorney, agent, or brave
A patent agent can draft and file, often for less. What they cannot do is take you to court or paper the deals around your patent. An attorney does both. Filing it yourself? Legal, sure. Wise, almost never, not for anything you mean to sell. A badly written patent is worse than none, because it hands you confidence you have not earned.
Do not skip the provisional
Most inventors I work with start with a provisional. It is cheaper, two to four thousand in fees, and it nails down your filing date for a year while you decide whether the full swing is worth it. It buys time. It is not, despite the name, a finished patent.