How to File a Patent

Step 1

Before you file — do your prior art search

Prior art is any public disclosure — a published patent, a journal article, a product for sale, a conference talk — that predates your patent application and describes your invention. The USPTO uses prior art to determine whether your invention is novel and non-obvious. If an examiner finds prior art that anticipates your claims, you get a rejection. If they find references that make your invention obvious in combination, you get a different kind of rejection. Either way, prior art you didn't find before filing becomes an expensive surprise 18 months later.

Google Patents (patents.google.com) is the most usable interface for prior art searches and your best starting point. Search by technical terms, not by your product's marketing name. If you're building a "smart lock," search "electromagnetic door latch wireless authentication" — describe the mechanism, not the product. Use the date filter to find art that predates your intended filing date. Skim abstracts quickly; read claims carefully only when the abstract looks relevant.

USPTO's Patent Public Search (ppubs.uspto.gov) is the official database and offers advanced field-specific searching that Google Patents doesn't expose. Search by CPC (Cooperative Patent Classification) codes for comprehensive results within a technology area. Find your CPC code by looking at similar patents on Google Patents — it's listed in the classification section.

Two specific rejection types dominate patent prosecution and you should know them before you search. A 35 USC § 102 rejection (anticipation) means the examiner found a single prior art reference that discloses every element of your claim. A 35 USC § 103 rejection (obviousness) means the examiner combined two or more references to argue that someone skilled in the field would have found your combination obvious. Section 103 rejections are far more common and harder to overcome. When searching, look not just for exact matches but for combinations of references that together cover your invention.

Run a quick sanity check before diving deep: PatentBrief Idea Check lets you describe your invention in plain English and surfaces similar patents instantly. It's not a substitute for a thorough search, but it's a fast first filter that can save you hours of digging in the wrong direction.

Step 2

Choose your patent type

The USPTO issues three categories of patents. Filing the wrong type — or pursuing one when you needed another — is a mistake that costs years and thousands of dollars. Choose based on what you're actually protecting.

For most technology and software founders, utility patents are the right choice. A utility patent covers the functional aspects of your invention — how it works, how it's made, how it's used. Design patents cover only the ornamental appearance (think Apple's rounded-rectangle iPhone patent) and are considerably faster and cheaper to obtain. Plant patents are irrelevant unless you're in agricultural biotech.

Step 3

File a provisional patent application

A provisional patent application does two things: it establishes your priority date and grants you "patent pending" status for 12 months. That's it. A provisional is never examined by an USPTO examiner. It never becomes a patent on its own. Think of it as a legal timestamp that says "as of this date, this inventor had this invention."

Why does this matter? Since the America Invents Act of 2013, the US operates on a strict first-to-file system. The inventor who files first gets the patent — not the inventor who conceived the idea first. If you're building something novel and not yet ready to file a full non-provisional, a provisional application is what stands between you and a competitor who could file the same idea tomorrow.

Filing fees for a provisional: approximately $320 for micro entities (independent inventors not assigned to a university or large company), $800 for small entities (businesses with fewer than 500 employees), and $1,600 for large entities. Micro entity status requires that you meet income and filing history criteria — confirm your eligibility before checking that box.

A provisional should include: a detailed written description of how your invention works (enough that someone skilled in the field could replicate it), informal drawings or diagrams showing the key elements, and a description of the best mode you know of implementing the invention. It does not need formal patent claims, though including draft claims helps you think through the scope you want to protect. The more complete your provisional, the more useful it is as a priority document.

The 12-month deadline is absolute. There is no grace period, no extension, no "close enough." If you file your provisional on June 1 and miss the June 1 deadline the following year, your priority date is gone entirely. You can still file a non-provisional afterward, but any public disclosures made in the intervening period become prior art against you. Set a calendar reminder for 11 months out. Some inventors skip the provisional entirely if they're ready to file a complete non-provisional — that's a legitimate choice if your application is fully drafted.

Step 4

Prepare your non-provisional application

A non-provisional patent application is the real application — the one that gets examined, prosecuted, and either granted or rejected. It has five required sections. Every one matters.

Claim drafting tip — use "comprising" not "consisting." In patent law, "comprising" means "including at least" — a claim that recites elements A, B, and C using "comprising" reads on any device that has A, B, and C plus additional elements. "Consisting of" means exactly and only those elements — far narrower. Nearly every independent claim should use "comprising."

Filing fees for a non-provisional: approximately $800 for micro entities, $1,600 for small entities, and $2,000–$3,000+ for large entities for the basic filing, search, and examination fees. These are USPTO government fees only — attorney preparation adds substantially more.

Step 5

File with the USPTO

All USPTO filings go through Patent Center, the USPTO's online filing system (which replaced EFS-Web in 2022). You'll need to create a USPTO.gov account if you don't have one. The system accepts PDF documents for the specification, claims, and abstract, and either PDF or specially formatted TIF/PDF for drawings.

After filing, you receive a filing receipt within a few days containing your application serial number, filing date, and confirmation of the documents received. Your filing date is the date the USPTO receives your application — not when you submit it. If you file at 11:58 PM on December 31, your filing date is December 31. Keep your filing receipt; it's the official record of your priority date.

Track your application status using Patent Center's PAIR module (Patent Application Information Retrieval). PAIR shows every document filed or issued in your application, examiner assignments, and the current status. Check it regularly — office actions can expire if you miss a response deadline. Once your application is published (typically 18 months from earliest priority date), it becomes publicly searchable and your "patent pending" status is visible to the world.

Step 6

The examination process

After filing, your application enters a queue. It is assigned to an Art Unit — a group of examiners who specialize in your technology area — and then to a specific examiner. The examiner conducts a prior art search (separate from yours), reviews your claims, and issues a written office action.

The average wait for a first office action is approximately 22 months for standard examination. Track One prioritized examination reduces this to 6–12 months for an additional fee of approximately $2,000–$4,000 (small vs. large entity). Most first office actions contain at least some rejections — a clean allowance on the first action is the exception, not the rule.

When the office action arrives, you have 3 months to respond (extendable to 6 months with extension fees, which escalate each month you extend). Your response can: amend your claims to distinguish them from the prior art, argue that the examiner's rejection is legally or factually incorrect, or both. Most successful prosecutions involve some combination of amendment and argument.

Responding effectively: When amending claims, you can only narrow them — you cannot add new matter that wasn't in the original specification. When arguing against rejections, cite specific differences between your claims and the cited references. Don't rely solely on amendment; examiners respond better when you also make arguments for why their rejection was wrong.

If the examiner is satisfied with your response, they issue a Notice of Allowance. You then pay the issue fee (approximately $1,200 for small entities) within 3 months, and your patent is granted. The patent number and full text are published in the Official Gazette. If the examiner maintains their rejections after two rounds, you can appeal to the Patent Trial and Appeal Board (PTAB) or file a continuation application to restart prosecution.

Step 7

After grant — maintenance fees and your options

A granted patent requires maintenance fees to stay in force. For utility patents, these are due at 3.5, 7.5, and 11.5 years from the grant date. Small entity fees: approximately $800 at 3.5 years, $1,800 at 7.5 years, and $3,700 at 11.5 years. Missing a maintenance fee deadline results in the patent going abandoned and entering the public domain — it cannot be revived without showing the delay was unintentional and paying a surcharge.

A granted patent gives you the right to exclude others from making, using, selling, offering for sale, or importing your invention in the United States. What you can do with it: license it to others for royalties, sell or assign it outright, use it defensively to block competitor filings in your space, or enforce it in federal district court if someone infringes. Enforcement is expensive — patent litigation averages $3–5 million per side — so most startup patent strategies focus on licensing and deterrence rather than litigation.

Timeline & Cost Summary

The full timeline at a glance

Professional Help

Do you need a patent attorney?

Honest answer: for most technology and software inventions, yes. Claim drafting is a highly specialized legal skill that takes years to develop. The claims you file are the claims you're stuck with — you cannot broaden them later. An engineer who drafts overly narrow claims might spend $1,000 on USPTO fees and get a patent that a competitor can design around in an afternoon. A well-drafted set of claims from an experienced practitioner might cost $8,000 in attorney fees but provide meaningful competitive protection.

Patent attorney vs. patent agent: Both are licensed by the USPTO to practice patent law (prosecuting applications). A patent attorney is also a licensed attorney who can advise on IP strategy, licensing agreements, and litigation. A patent agent is technically registered to file and prosecute applications but is not a licensed attorney. Both require passing the USPTO's registration exam (the "patent bar"), which requires a technical undergraduate degree.

Estimated total cost with an attorney: $5,000–$15,000 for a utility patent through grant, depending on complexity and number of office action rounds. Biotech and pharmaceutical patents typically run higher ($15,000–$30,000+) due to specification complexity.

If cost is a constraint, the USPTO's Pro Se Assistance Program and the Patent Pro Bono Program match qualifying inventors with volunteer attorneys at no cost. PatentBrief is a patent education tool, not a law firm, and nothing on this page constitutes legal advice. For professional guidance on your specific invention, consult a registered patent attorney or agent.

FAQ

Common questions