How to Patent an Invention: Requirements, Filing, and Costs

To patent an invention in the United States, you confirm it qualifies for patent protection, search for prior art, file a provisional or non-provisional application with the US Patent and Trademark Office (USPTO), respond to the examiner’s rejections during a process that typically runs two or more years, pay the issue fee, and then pay maintenance fees at three points over the patent’s 20-year life.¹ Each stage has its own fees, deadlines, and legal traps, and missing any of them can cost you the patent.

Confirm Your Invention Can Be Patented

Federal law allows patents only on inventions that fit into one of four categories: a process (a series of steps producing a result), a machine, a manufactured article, or a composition of matter such as a chemical compound or alloy.² An improvement on any of those also qualifies. Three things never qualify on their own: laws of nature, natural phenomena, and abstract ideas. You cannot patent a mathematical equation, a newly discovered mineral in its natural state, or a purely abstract business concept.

The Supreme Court’s 2014 decision in Alice Corp. v. CLS Bank gave examiners a two-step test: does the claim target one of those ineligible concepts, and if so, does it add an “inventive concept” that turns it into a genuine application?³ Software and business-method claims get rejected on this basis routinely. The invention needs to do something concrete and specific.

Beyond that category question, the invention must clear three requirements: utility, novelty, and non-obviousness.⁴

Utility

The invention must actually work and provide a real benefit. A mechanical device that performs its stated function clears this bar easily. Utility becomes a real problem in pharmaceuticals and biotech, where an applicant claims a compound treats a disease but shows no evidence that it does.

Novelty

The invention must be new. It lacks novelty if it was already patented, described in a publication, in public use, on sale, or otherwise available to the public before your application’s effective filing date. If you disclosed the invention yourself, a one-year grace period lets you still file, but relying on it is risky because someone else’s independent disclosure during that year can still sink you.⁵

Non-Obviousness

Most rejections happen here. Even if the invention is technically new, the examiner will reject it if someone with ordinary skill in the field would have found it obvious given what already existed.⁶ Examiners often combine two or three existing references and call the result a predictable combination. Overcoming that usually means showing why the combination would not have been predictable or why the results were surprising.

Search for Prior Art

Before spending money on an application, look for existing patents and publications that overlap with your invention. This is how you find out whether the novelty and non-obviousness hurdles are actually clearable.

Start with the USPTO’s Patent Public Search, which covers all issued US patents and published applications. Google Patents has a friendlier interface and includes international results. For wider international coverage, the European Patent Office’s Espacenet database and WIPO’s PATENTSCOPE search patent filings from dozens of countries.⁷ Journal articles, conference papers, product manuals, and even YouTube videos can count as prior art if they were publicly available before your filing date.

A thorough search will not guarantee the examiner won’t find something you missed, but it saves you from filing a doomed application and shapes how you draft your claims.

Pick the Right Type of Application

Provisional Application

A provisional application is an informal placeholder that locks in a filing date without starting the examination clock. It does not need formal claims or an inventor’s oath, and it lets you use the “Patent Pending” label immediately.⁸ The filing fee is $65 for micro entities, $130 for small entities, and $325 for large entities.⁹

The provisional expires exactly 12 months after filing, and that deadline cannot be extended. You must file a non-provisional application within those 12 months to claim the provisional’s earlier filing date.⁸ If you miss it, you have two additional months to file a petition for restoration, but only if the delay was unintentional, and you’ll pay an extra petition fee.¹⁰ After 14 months the priority date is gone.

A provisional makes sense when you need to establish a priority date fast, such as before a trade show or product launch. The provisional must describe the invention in enough technical detail to support the claims you’ll eventually file. A vague provisional will not hold up.

Non-Provisional (Utility) Application

This is the real filing that gets examined and can become a granted patent. It needs a detailed written specification describing how to make and use the invention, at least one formal claim defining the legal boundaries of what’s protected, and drawings when the invention’s nature requires them. Minimum USPTO fees combining filing, search, and examination are $400 for a micro entity, $800 for a small entity, and $2,000 for a large entity.⁹

Design Patents Are a Separate Track

If what’s inventive is how the product looks rather than how it works, you’re looking at a design patent, which protects the ornamental appearance of an article of manufacture.¹¹ Design patents last 15 years from grant and require no maintenance fees.¹² If both the look and the function are inventive, you can pursue both types on the same product. Everything else below concerns utility patents.

Know Your Entity Status Before You Pay

The USPTO charges different fees depending on the applicant’s size, and the discounts are large.

Large entity: any applicant that does not qualify as small or micro. Pays full fees.
Small entity: individual inventors, businesses with fewer than 500 employees, and nonprofit organizations, provided they haven’t licensed rights to a large entity. Small entities pay 60% of the large-entity fee.¹³
Micro entity: a small entity that also has not been named as inventor on more than four previously filed US patent applications and whose gross income does not exceed three times the US median household income (approximately $251,000 as of September 2025). Micro entities pay 75% less than large entities. The income threshold adjusts annually.¹⁴

You have to re-certify entity status every time you pay a fee. If your circumstances change, such as licensing to a large company or crossing the income threshold, you must pay the higher rate going forward.

File the Application

Non-provisional applications are filed electronically through the USPTO’s Patent Center.¹⁵ The submission includes the specification (written description, claims, abstract), any drawings, the filing fee, and an application data sheet identifying the inventors and applicant. Most applicants also submit an Information Disclosure Statement listing prior art they know about, which ties directly to a legal duty covered below.

Getting the claims right is the most consequential part of drafting. Claims that are too narrow let competitors design around them. Claims that are too broad invite rejection. Practitioners typically draft in layers: a few broad independent claims covering the core concept, followed by narrower dependent claims that add specific features. If the broad claims get rejected, the narrower ones may survive.

What Happens During Examination

The Wait for the First Office Action

After filing, the USPTO assigns your application to an examiner who specializes in the relevant technology. The examiner runs an independent prior art search and evaluates whether the claims meet all legal requirements. As of early 2026, the average wait for a first Office Action is about 22 months from filing, and wait times vary by technology area.¹⁶

Responding to Rejections

The first Office Action almost always includes rejections. That’s normal. The examiner typically rejects claims as obvious over multiple prior art references or as lacking novelty over a single reference. You get a set period, usually three months and extendable for a fee, to respond with amended claims, legal arguments, or both. This back-and-forth is called prosecution, and it’s where the real negotiation over what the patent will cover happens.

If the examiner isn’t persuaded, the next action is typically marked “final.” A final rejection is a procedural marker, not the end. Your options include filing a Request for Continued Examination (which reopens prosecution and requires paying the examination fee again), filing a continuation application, or appealing to the Patent Trial and Appeal Board. Each path costs more time and money, but many patents are granted after one or more rounds of final rejection.

Allowance and Grant

When the examiner decides the claims are patentable, the USPTO mails a Notice of Allowance specifying the issue fee. You have three months from that notice to pay: $258 for micro entities, $516 for small entities, or $1,290 for large entities.¹⁷⁹ That three-month deadline cannot be extended. Miss it and the application goes abandoned. Once the issue fee is paid, the patent typically grants within a few weeks.

If You Cannot Wait

The USPTO’s Track One prioritized examination aims for a final disposition within 12 months of filing. The extra fee is $903 for micro entities, $1,806 for small entities, or $4,515 for large entities, on top of regular filing fees.⁹¹⁸

Your Legal Duty to Disclose Prior Art

Every person substantively involved in a patent application, including the inventor and the attorney, has a legal duty to disclose all information they know of that is material to patentability.¹⁹ In practice, that means submitting an Information Disclosure Statement listing every prior art reference or document you’re aware of that could affect patentability, including references that hurt your case.

Information is material if it establishes a case that a claim is unpatentable, or if it contradicts a position you’ve taken during prosecution. Hiding a damaging reference is one of the fastest ways to lose a patent: a court can declare the whole patent unenforceable for “inequitable conduct” if it finds you intentionally withheld material information. File the disclosure early, ideally before the first Office Action, to avoid the extra fees and complications that apply to late submissions.²⁰

Keep the Patent Alive After It Issues

Getting the patent is not the end of the cost. Utility patents require maintenance fee payments at three intervals:⁹

3.5 years after grant: $430 (micro), $860 (small), $2,150 (large)
7.5 years after grant: $808 (micro), $1,616 (small), $4,040 (large)
11.5 years after grant: $1,656 (micro), $3,312 (small), $8,280 (large)

Miss a payment and there’s a six-month grace period with a surcharge. Miss the grace period and the patent expires.²¹ Restoration after that is possible only if the delay was unintentional and requires a petition and additional fees. Calendar these dates the day the patent issues.

Once granted, mark your products with the patent number, or use a free publicly accessible webpage linking the product to the patent number. Marking preserves your right to collect damages from infringers. Without it, you can only recover damages from the date you actually notified the infringer, potentially forfeiting years of back damages.

Protection Outside the United States

A US patent only protects the invention inside the United States. For protection abroad, the Patent Cooperation Treaty (PCT) gives you a streamlined path to file in over 150 countries through a single international application. The PCT filing generally must happen within 12 months of your earliest US filing date to claim priority.²²

A PCT filing does not create an international patent. No such thing exists. It buys time: up to 30 months from your original priority date before you must enter the national phase in each country where you want protection, paying that country’s fees and meeting its requirements. That extra time lets you evaluate commercial potential in different markets before committing to foreign prosecution costs.

What the Whole Process Costs

For a micro entity filing a utility patent without an attorney, the minimum USPTO fees from provisional filing through grant are roughly $65 for the provisional, $400 for the non-provisional filing, and $258 for the issue fee, about $723 total before maintenance. Small entities pay about double, and large entities roughly five times the micro rate.

Most applicants also hire a patent attorney or agent. Professional fees for drafting and prosecuting a utility application commonly run $5,000 to $15,000 or more depending on complexity. Formal patent drawings, if you don’t prepare them yourself, typically cost $30 to $125 per sheet.

Maintenance fees over the patent’s 20-year life add another $2,894 for micro entities, $5,788 for small entities, or $14,470 for large entities. Budget for the full lifecycle before deciding whether patent protection makes financial sense for a particular invention.

1
United States Patent and Trademark Office. MPEP 2701 – Patent Term
2
Office of the Law Revision Counsel. 35 US Code 101 – Inventions Patentable
3
Justia US Supreme Court. Alice Corp v CLS Bank Intl, 573 US 208 (2014)
4
United States Patent and Trademark Office. Patent Essentials – Section: What Can Be Patented?
5
Office of the Law Revision Counsel. 35 US Code 102 – Conditions for Patentability; Novelty – Section: Exceptions
6
Office of the Law Revision Counsel. 35 US Code 103 – Conditions for Patentability; Non-Obvious Subject Matter
7
United States Patent and Trademark Office. Search for Patents – Section: Search International Patent Offices
8
United States Patent and Trademark Office. Provisional Application for Patent
9
United States Patent and Trademark Office. USPTO Fee Schedule
10
United States Patent and Trademark Office. Restoration of Benefit of a Provisional Application or Priority Foreign Application
11
United States Patent and Trademark Office. MPEP 1502 – Definition of a Design
12
United States Patent and Trademark Office. MPEP 1505 – Term of Design Patent
13
eCFR. 37 CFR 1.27 – Definition of Small Entities and Establishing Status
14
United States Patent and Trademark Office. Micro Entity Status
15
United States Patent and Trademark Office. File Online
16
United States Patent and Trademark Office. Patents Pendency Data – Section: First Office Action Pendency
17
United States Patent and Trademark Office. MPEP 1303 – Notice of Allowance
18
United States Patent and Trademark Office. USPTO’s Prioritized Patent Examination Program
19
eCFR. 37 CFR 1.56 – Duty to Disclose Information Material to Patentability
20
United States Patent and Trademark Office. MPEP 609 – Information Disclosure Statement
21
Office of the Law Revision Counsel. 35 US Code 41 – Patent Fees
22
United States Patent and Trademark Office. MPEP 1842 – Basic Flow Under the PCT