To apply for a patent, you search existing patents to confirm your invention is new, choose the right type of patent, prepare a written application that describes the invention and defines your claims, file it through the United States Patent and Trademark Office’s Patent Center portal with the correct fees, and then work through an examination process that usually takes two years or more before a patent issues. Government filing fees alone run from $400 for a micro entity to $2,000 for a large entity, and the total cost grows through examination, issuance, and maintenance. Every stage has firm deadlines, and a missed one can cost you the invention permanently.
Step 1: Search for Existing Patents and Publications
Federal law bars a patent if the invention was already patented, described in a publication, in public use, or on sale before your filing date.1Office of the Law Revision Counsel. 35 USC 102 – Conditions for Patentability; Novelty Even without an exact match, your application will be rejected if the differences between your invention and existing technology would be obvious to someone working in the field.2Office of the Law Revision Counsel. 35 USC 103 – Conditions for Patentability; Non-obvious Subject Matter
Start with the USPTO Patent Public Search tool, which contains full-text records of granted patents from 1971 forward.3USPTO. Advanced Search Overview QRG – Patent Public Search The Global Dossier gives you free access to examination histories from patent offices worldwide, useful for seeing how similar inventions fared abroad.4United States Patent and Trademark Office. Global Dossier A clean search does not guarantee approval, but it tells you how broadly you can realistically claim protection and helps you write stronger claims later.
The One-Year Grace Period on Your Own Disclosures
If you publicly disclosed your invention yourself, federal law gives you twelve months from that disclosure to file. A disclosure by the inventor within that window does not count as prior art against the application.5Office of the Law Revision Counsel. 35 US Code 102 – Conditions for Patentability; Novelty Relying on the grace period is risky. Most other countries do not offer one, so a public disclosure before filing can permanently destroy your ability to patent the same invention abroad.
Step 2: Choose the Right Type of Patent
The USPTO issues three kinds, and picking the wrong one is expensive to fix.
- A utility patent covers new and useful processes, machines, manufactured articles, or compositions of matter. It protects how something works and is by far the most common type. Utility patents last 20 years from the filing date, provided maintenance fees are paid.6Office of the Law Revision Counsel. 35 USC 101 – Inventions Patentable7USPTO. Patent Term
- A design patent covers the ornamental appearance of a manufactured article, not its function. For applications filed on or after May 13, 2015, design patents last 15 years from the date of grant.8Office of the Law Revision Counsel. 35 USC 171 – Patents for Designs
- A plant patent covers new varieties of plants reproduced asexually, through cuttings or grafts rather than seeds. Plant patents last 20 years from filing.9Office of the Law Revision Counsel. 35 USC 161 – Patents for Plants
If your invention has both a novel mechanism and a distinctive look, you may need a utility patent and a design patent. One does not substitute for the other.
Step 3: Decide Between a Provisional and Non-Provisional Application
Most inventors face an early decision: file a provisional application first, or go straight to the non-provisional application that gets examined. A provisional locks in an early filing date at a lower cost, lets you mark the product “Patent Pending,” and gives you 12 months to decide whether to invest in the full application.10United States Patent and Trademark Office. Provisional Application for Patent
A provisional needs a written description detailed enough to meet the same technical disclosure standard as a non-provisional, along with any drawings needed to understand the invention, a cover sheet, and the filing fee. It does not need formal claims or a signed oath, and the USPTO never examines it. If you don’t file a corresponding non-provisional within 12 months, the provisional expires and you lose the filing date.
Treating the provisional as a rough sketch is a common and costly mistake. If the description doesn’t fully support the claims you later file in the non-provisional, the USPTO will not give those claims credit for the earlier filing date. Write it as carefully as you’d write the final application.
Step 4: Confirm Your Entity Status
Your entity status sets the fee you pay at nearly every stage. The USPTO offers two discount tiers below the standard large-entity rate.11United States Patent and Trademark Office. Save on Fees with Small and Micro Entity Status
- Small entity status brings a 60% discount on most fees. Individual inventors, businesses with fewer than 500 employees, and nonprofits qualify, as long as they haven’t licensed the invention to a large entity.
- Micro entity status brings an 80% discount. You must already qualify as a small entity, each inventor must have been named on no more than four previously filed applications, and each must have earned no more than $251,190 in gross income for the prior calendar year. The invention cannot be licensed to any entity exceeding that income threshold.12United States Patent and Trademark Office. Micro Entity Status
The income threshold changes yearly with national median household income, so check the USPTO’s micro entity page before filing. If your status changes after filing, you have to start paying at the correct higher rate going forward. Claiming a discount you don’t qualify for can jeopardize the patent itself.
Step 5: Prepare the Application Documents
A non-provisional application is a package of interrelated documents, each with its own formatting and content rules. Missing or defective documents trigger a notice of missing parts, which delays the application and adds fees.
Specification and Claims
The specification is the core of the application. It must describe the invention in enough detail that a person skilled in the relevant field could build and use it without guessing.13Office of the Law Revision Counsel. 35 USC 112 – Specification The claims, which conclude the specification, define the exact legal boundaries of your patent. The specification explains what the invention is and how it works; the claims stake out the territory you’re asking the government to protect.
Poorly drafted claims are where most applications get into trouble. Claims that are too vague get rejected as indefinite. Claims that are too narrow produce a patent competitors can design around. Claims that are too broad get invalidated by prior art. This is where hiring a patent attorney or agent tends to pay for itself. Professional fees to draft and file a utility application typically run between $3,500 and $20,000 depending on complexity.
Drawings
Drawings are required whenever they help someone understand the invention, which in practice means almost always.14eCFR. 37 CFR 1.84 – Standards for Drawings The USPTO enforces strict rules on line quality, shading, margins, labeling, and views. Photographs are only accepted when drawings are impractical, such as for microscopic structures or living organisms.
Application Data Sheet
The Application Data Sheet lists inventor names, legal residences, correspondence addresses, and other identifying information. If you’re claiming benefit of an earlier provisional, this is where you list its serial number and filing date.15USPTO. Important Information for Completing an Application Data Sheet (ADS) The USPTO recommends generating the ADS through Patent Center rather than uploading a PDF, because the web version can pre-populate data and helps put benefit claims in the correct reverse-chronological order.
Oath or Declaration and Abstract
Each named inventor must sign a declaration stating they believe themselves to be the original inventor and acknowledging their duty to disclose information relevant to patentability. False statements in this document can permanently invalidate the patent.
You also need an abstract: a single paragraph, ideally 50 to 150 words, summarizing the technical disclosure. The abstract cannot exceed 15 lines and must appear on its own separate sheet.16USPTO. 608 Disclosure
Information Disclosure Statement
You have a legal duty to tell the USPTO about anything you know that is relevant to patentability. The Information Disclosure Statement is the formal vehicle. Filing it within three months of your filing date or before the first office action costs nothing extra; the USPTO will consider it without additional fees or certifications.17USPTO. 609 Information Disclosure Statement Later filings require a certification or a fee, and submissions after a notice of allowance require both. When in doubt, disclose. A court that finds you withheld material information with intent to deceive can declare the entire patent unenforceable.
Step 6: File the Application and Pay the Fees
You submit the completed application through Patent Center, which handles document uploads, fee payments, and status tracking. At filing, you owe three separate government fees: a basic filing fee, a search fee, and an examination fee. For a standard utility application:18eCFR. 37 CFR 1.16 – National Application Filing, Search, and Examination Fees
- Large entity: $2,000 total ($350 filing, $770 search, $880 examination)
- Small entity: $800 total ($140 filing, $308 search, $352 examination)
- Micro entity: $400 total ($70 filing, $154 search, $176 examination)
These are base fees. Extra independent claims beyond three, total claims beyond twenty, and applications over a certain page count each add surcharges. Paying the wrong amount produces a notice of missing parts and late fees. Once everything is processed, Patent Center issues an Electronic Acknowledgment Receipt with your filing date and application number, and that receipt is your permanent proof of filing.
Publication After 18 Months
Most utility and plant applications are published 18 months after the earliest filing date claimed. Publication is automatic and makes your application public even before examination begins.19USPTO. Eighteen-Month Publication of Patent Applications Design applications are not published before grant. You can request non-publication at filing, but only if you certify you have not and will not file abroad in a country requiring 18-month publication.
Faster Examination Through Track One
If waiting two years is not workable, the Track One program targets a final decision within 12 months of granting prioritized status. The application can contain no more than four independent claims and thirty total claims, with no multiple dependent claims. The prioritized examination fee is $4,515 for a large entity, $1,806 for a small entity, or $903 for a micro entity, on top of the standard filing fees.
Filing Abroad Requires a License First
If you plan to file in other countries for an invention made in the United States, federal law requires a foreign filing license from the USPTO. You cannot file abroad until at least six months after your U.S. filing unless you receive the license sooner.20Office of the Law Revision Counsel. 35 US Code 184 – Filing of Application in Foreign Country Filing abroad without the license can cost you your U.S. patent rights entirely. In most cases, the license is granted automatically and printed on your filing receipt.
Step 7: Work Through Examination
After filing, your application joins a queue. A patent examiner in the relevant technology center eventually reviews your claims against prior art and the statutory requirements. The current average wait for that first review is about 22 months, though it varies by field. Some technology areas see first actions in under 19 months; biotechnology and chemical applications can take 27 months or more.21United States Patent and Trademark Office. Pendency – Patents Dashboard
The examiner’s first written response is an Office Action. It usually rejects some or all of your claims, citing specific prior art or legal deficiencies. First-action rejections are normal. This is where most of the back-and-forth in patent prosecution happens.
Deadlines for Responding
By statute, you have up to six months to respond to most Office Actions. The USPTO almost always shortens that to two or three months in the action itself. You can buy time in one-month increments up to the six-month limit, with each additional month costing more than the last.22United States Patent and Trademark Office. Responding to Office Actions Miss the six-month deadline and the application goes abandoned.
Your response can amend the claims, argue that the examiner is wrong, or both. You can also request an interview to discuss the rejections directly with the examiner. The USPTO encourages using its Automated Interview Request form to schedule these conversations.23USPTO. 713 Interviews
Final Rejections and Continued Examination
If the examiner isn’t persuaded, you may receive a “final” Office Action. The label is misleading. You can file a Request for Continued Examination (RCE), which reopens prosecution with new amendments or arguments. A first RCE costs $1,500 for a large entity, $600 for a small entity, or $300 for a micro entity. A second or later RCE costs $2,860, $1,144, or $572 respectively. You can also appeal to the Patent Trial and Appeal Board if you believe the examiner’s legal analysis is wrong.
Step 8: Pay the Issue Fee and Keep the Patent Alive
When the examiner concludes your claims are patentable, you receive a Notice of Allowance. You then have three months to pay the issue fee: $1,290 for a large entity, $516 for a small entity, or $258 for a micro entity. Once paid, the patent is granted and published.
Granting is not the end of the money. Utility patents require three maintenance fee payments to stay in force for the full 20-year term. Miss one and the patent expires.
- Due 3.5 years after grant: $2,150 large entity, $860 small, $430 micro
- Due 7.5 years after grant: $4,040 large entity, $1,616 small, $808 micro
- Due 11.5 years after grant: $8,280 large entity, $3,312 small, $1,656 micro
Each payment window opens six months before the due date. If you miss it, a six-month grace period follows, but you owe a surcharge of $540, $216, or $108 depending on entity status on top of the maintenance fee.24eCFR. 37 CFR 1.362 – Time for Payment of Maintenance Fees Miss the grace period and the patent expires. You can petition to revive it by showing the delay was unintentional, but the petition requires additional fees and a sworn statement, and delays longer than two years face heightened scrutiny.25USPTO. 2590 – Acceptance of Delayed Payment of Maintenance Fee in Expired Patent to Reinstate Patent
Design patents and plant patents do not require maintenance fees. A large-entity inventor who holds a utility patent for the full 20 years will pay $14,470 in maintenance fees alone, on top of every filing and examination cost. Factor those numbers in before you start.