Almost every US patent application has twenty claims, and it is not a coincidence. The USPTO filing fee covers up to twenty total claims and up to three independent claims. Everything past that carries an excess claim fee, and the fee structure has quietly standardized how American applications are written. The real question is not how many claims you are allowed — it is how many distinct positions your invention can actually support.
The fee structure that sets the default
| Item | What the base filing fee covers | Beyond that |
|---|---|---|
| Total claims | 20 | An excess fee per claim, roughly $100 at the small-entity rate |
| Independent claims | 3 | A larger per-claim fee, several hundred dollars each undiscounted |
| Multiple dependent claims | None included | A single substantial surcharge; each is counted as its many dependencies |
Rates change periodically and small and micro entity discounts cut them by 60 and 80 percent, so check the current USPTO fee schedule before budgeting — and confirm your status first, because the difference is large: the micro entity qualification rules are stricter than most founders assume. Multiple dependent claims are essentially never used in US practice because of how they are counted.
What the claims are doing
Claims are not descriptions of the invention. They are the boundary of the legal right, and each one is read as a standalone definition. Infringement requires every element of a claim to be present in the accused product, which produces the fundamental tradeoff: fewer elements means broader coverage and more exposure to prior art; more elements means narrower coverage and easier allowance. How patent claims work covers the structure in detail.
That tradeoff is why a claim set is layered rather than uniform. The independent claims stake out the broadest position you think is defensible. The dependent claims are fallback positions, each adding a feature, so that when the examiner knocks out claim 1 there is already a narrower claim on file with support.
The practical answer
For a typical mechanical or electronic product, a well-constructed US application lands at:
- 2 to 3 independent claims — usually one apparatus, one method, and where relevant one system or computer-readable-medium claim
- 15 to 18 dependent claims distributed across them
- 20 total, staying inside the base fee
That is a default, not a rule — deviate deliberately, with a reason.
Why different independent claim types matter
An apparatus claim covers the thing. A method claim covers the steps of using or making it. They catch different infringers: a competitor who sells the device infringes the apparatus claim, while a service provider who performs the process may only infringe the method claim. If your invention is really a way of manufacturing something, the method claim is the main asset — see patenting a manufacturing process instead of a product, and note the detectability problem that comes with it.
When more than twenty claims is justified
- Genuinely different embodiments that a single claim cannot cover — a handheld version and a benchtop version with different mechanisms.
- Chemical or materials cases where ranges, compositions, and processes multiply legitimately.
- High-value assets where the extra few thousand dollars is trivial against the commercial stakes.
- Anticipating design-arounds. If you can already predict three ways a competitor would avoid claim 1, claims aimed at each of those are worth their fee.
When fewer is smarter
Padding a claim set with trivial dependents — "wherein the housing is plastic," "wherein the fastener is a screw" — buys nothing. It does not broaden coverage, it does not create useful fallbacks, and it gives an examiner and later a challenger more surface to work with. Each claim should represent a feature you would genuinely want as a fallback position if the broader claim fell.
There is also a prosecution cost. Every claim has to be examined, argued, and amended, and a bloated set makes each office action response more expensive. That compounds across the two or three rounds most applications take — the full arithmetic is in what a US patent costs.
Restriction requirements: the thing nobody expects
If your claims cover what the examiner considers two or more distinct inventions, you will get a restriction requirement under 35 U.S.C. 121. You then elect one group for examination, and the rest are withdrawn. They are not lost — you can pursue them in a divisional application that keeps the original priority date — but you pay a second full filing and prosecution cycle.
This is a common outcome when an application mixes an apparatus, a method of manufacturing it, and a method of using it. It is not a disaster, and sometimes it is deliberate: filing broadly and letting the examiner sort the families can be a reasonable strategy if you have the budget for divisionals. What it should not be is a surprise.
The foreign filing angle
Claim counts that are free in the US are expensive elsewhere. The EPO charges a fee for each claim past fifteen and a steeper one past fifty, and several national offices apply their own escalations. If a PCT and national-phase entries are planned, it is common to file a US-optimized set of twenty and then trim to fifteen or fewer on entry into Europe. Budget for that in advance — how the EPO process works and what it costs covers the fee structure, and which countries to file in is the decision that comes first.
Continuations are how you get more claims later
The most useful thing to understand about claim count is that it is not a one-shot decision. As long as one application in the family stays pending, you can file a continuation with a new claim set drawn to the same disclosure — including claims deliberately shaped around a competitor's product that did not exist when you filed. That is far more valuable than thirty claims filed blind on day one. The constraint is that continuations cannot add new matter, so the original specification has to be rich enough to support them; the limits are covered in what you can amend after filing, and a thin specification is one of the recurring mistakes on a first patent application.
Projects House is an engineering firm, not a law firm — the claim set is your patent attorney's work product. What we supply is the input that makes a claim set worth having: fully documented alternative embodiments, dimensioned variants, and an honest engineering assessment of how a competent competitor would build around your design. If your application is being drafted from a single prototype, talk to us through the contact form before it is filed.