You have an invention worth protecting. Maybe it is a new software process, a hardware component, a manufacturing method, or a consumer product with a unique mechanism. You have heard that patents matter. You know competitors will copy you if you do not act. What you do not know is what actually happens after you decide to file.
Patent prosecution is the formal process of obtaining a granted patent from the United States Patent and Trademark Office (USPTO). It begins with a patent application and ends — if successful — with a patent grant that gives you the right to exclude others from making, using, selling, or importing your invention in the United States for up to 20 years from the filing date of your non-provisional application.
The process is detailed, procedural, and unforgiving of mistakes made early. This guide explains every stage in plain English so that inventors and startup founders understand what they are getting into before the first dollar is spent.
Step 1: Provisional vs. Non-Provisional — Choosing Your Entry Point
Most patent prosecution strategies begin with a decision about filing type. You have two choices: a provisional patent application or a non-provisional patent application.
The Provisional Patent Application
A provisional application (PPA) is a lower-cost, 12-month placeholder that establishes your priority date — the date the USPTO recognizes as the earliest point at which you disclosed your invention. It does not get examined, does not publish, and does not become a patent on its own. Its only job is to hold your place in line.
The strategic value of a provisional is timing. The United States operates under a first-inventor-to-file system under the America Invents Act (AIA). The inventor who files first typically wins a priority dispute. If you are still refining your product, raising a funding round, or preparing to show your invention at a trade show, a provisional buys you 12 months to do that without losing your priority date.
At the end of those 12 months, you must file a non-provisional application that claims priority to the provisional, or the provisional expires and you lose the priority date it established.
The Non-Provisional Patent Application
The non-provisional application is the real filing. It includes a specification (a detailed written description of the invention), drawings, an abstract, and most importantly, the claims. The claims are the legal boundaries of your patent — they define exactly what you own. Everything else in the application supports the claims. Only the claims matter for enforcement.
Once a non-provisional application is filed and accepted, it enters the examination queue at the USPTO. This is where patent prosecution in the formal sense begins.
Step 2: The Examination Queue and Wait Times
After filing, your application sits in a queue waiting for assignment to a patent examiner. The examiner is a USPTO employee with technical expertise in your field of invention. They are responsible for reviewing your application, searching prior art, and deciding whether your claims are patentable.
Wait times vary by technology field. In 2026, average pendency from filing to first office action — the first substantive response from the examiner — ranges from 14 to 30 months depending on the art unit (the USPTO workgroup that handles your technology area). Software-related inventions and business method patents tend to wait longer. Mechanical and chemical inventions tend to move faster.
Track One Prioritized Examination
If you need a faster result, the USPTO offers Track One prioritized examination for an additional fee. Track One applications receive a first office action within approximately three months and a final disposition within twelve months. The tradeoff is cost — the Track One fee runs into the hundreds of dollars on top of standard filing fees — and the limitation of four independent claims and thirty total claims per application. For startups that need a patent grant before closing a funding round or signing a licensing deal, Track One is often worth every dollar.
Step 3: The First Office Action
The first office action (FOA) is the examiner's first written response to your application. It almost always includes rejections. Do not be alarmed by this. A first office action with rejections is normal. Very few patent applications sail through examination without at least one rejection. Receiving rejections does not mean your invention is not patentable — it means the examiner has found issues that require a response.
The Two Most Common Rejections
The examiner will cite prior art — previously published patents, patent applications, scientific articles, or other public disclosures — to reject your claims. The two most common types of prior art rejection are anticipation and obviousness.
Anticipation (35 U.S.C. 102): An anticipation rejection means the examiner has found a single prior art reference that discloses every element of one of your claims. If every element of Claim 1 appears in a single patent filed before your priority date, Claim 1 is anticipated. The fix is to narrow the claim by adding a limitation that distinguishes your invention from that prior art reference, or to argue that the examiner has misread the prior art.
Obviousness (35 U.S.C. 103): An obviousness rejection means the examiner believes a person of ordinary skill in the field would have found it obvious to combine two or more prior art references to arrive at your claimed invention. Obviousness rejections are more flexible — and more common. Responding to them often requires a combination of claim amendments and legal argument about why the combination of references does not support the rejection.
Step 4: Responding to the Office Action
After receiving a first office action, you have three months to respond without additional fees (extendable up to six months with fees). Your response will typically include one or both of the following: claim amendments and arguments.
Claim Amendments
You can narrow your independent claims to add limitations that distinguish your invention from the cited prior art. The goal is to find the broadest claim scope that the prior art does not cover and that still captures the commercially meaningful aspects of your invention.
Narrowing claims is a strategic exercise, not just a legal one. If you narrow too far, you lose claim scope and may not be able to enforce the patent against competitors who make slight design-arounds. If you do not narrow enough, the examiner will reject the amended claims again. Getting this balance right requires both technical understanding of your invention and experience reading examiner behavior in a particular art unit.
Prosecution History Estoppel
Every amendment you make during prosecution becomes part of the prosecution history — a public record of everything filed with the USPTO during examination. Under the doctrine of prosecution history estoppel, arguments and amendments you make to distinguish prior art can limit your ability to claim equivalents later during enforcement. If you argue that your invention differs from a prior art reference because it uses Component A instead of Component B, you may be estopped from later arguing that a competitor who uses Component B infringes your patent under the doctrine of equivalents.
This is why prosecution decisions must be made with enforcement in mind from the beginning. The choices made in the patent prosecution process directly affect what the patent is worth.
Step 5: Final Rejections and What Comes Next
If the examiner is not satisfied with your response to the first office action, they may issue a final rejection. The word "final" is misleading — it does not necessarily end prosecution. It limits your options and raises the cost of continuing.
After-Final Options
After a final rejection, you have several paths forward:
Request for Continued Examination (RCE): An RCE resets prosecution. You pay an additional fee, file a new amendment or argument, and the application returns to the examiner for another round of examination. RCEs are common and often necessary. They extend the time and cost of prosecution but keep your application alive.
Appeal to the Patent Trial and Appeal Board (PTAB): If you believe the examiner has made a legal error, you can appeal to the PTAB — an administrative tribunal within the USPTO. Appeals take time (often 18 to 24 months) and cost more than an RCE, but they provide an independent review of the examiner's rejections. PTAB appeals succeed in a meaningful percentage of cases, particularly when the examiner has applied prior art incorrectly.
After-Final Consideration Pilot (AFCP) Program: The USPTO offers a program that allows applicants to submit claim amendments and request an interview with the examiner after a final rejection, without paying an RCE fee. AFCP responses are limited in scope but can resolve straightforward rejections without the cost of a full RCE.
Step 6: Continuation Applications — Protecting Your Portfolio
Patent prosecution is not always linear. While a parent application is pending, you can file continuation applications — new applications that share the same specification and priority date as the parent but contain different claims.
Continuations allow you to pursue broader claims if your original claims were narrowed during prosecution, to target specific competitors with tailored claims, or to protect improvements to the original invention. A well-managed patent portfolio uses continuations strategically to build layers of protection around a core technology.
As long as the parent application or any continuation in the chain remains pending, you can file additional continuations. This means a single invention can generate multiple patents with different claim scopes, all sharing the same early priority date.
Step 7: Notice of Allowance and Issuance Fees
When the examiner determines that your claims are patentable, they issue a notice of allowance. This is the finish line of prosecution. You have three months from the notice of allowance to pay the issue fee, after which your patent will be formally granted and published in the Official Gazette.
The issue fee varies by entity size. Large entities pay more than small entities (companies with fewer than 500 employees that have not licensed the patent to a large entity). Micro entities — independent inventors and certain other qualifying applicants — pay even less. Getting your entity size classification right matters: paying at the wrong size is an error that can require correction.
Step 8: Maintenance Fees — Keeping Your Patent Alive
A granted patent does not last 20 years for free. Utility patents require maintenance fees paid at 3.5, 7.5, and 11.5 years after the grant date. If you miss a maintenance fee, your patent lapses and enters the public domain. The USPTO does allow a six-month late payment window with a surety fee, and petitions to revive unintentionally abandoned patents are possible — but prevention is far cheaper than cure.
Many startups budget carefully for prosecution costs but overlook the long-term cost of maintaining a portfolio. A patent that generates licensing revenue or protects a core product line is worth maintaining. A patent that covers abandoned technology may not be.
Quick Answers: Patent Prosecution at a Glance
What is patent prosecution?
Patent prosecution is the process of obtaining a granted patent from the USPTO, beginning with the filing of a patent application and ending with a grant or final abandonment.
How long does patent prosecution take?
Standard prosecution takes 2 to 4 years on average. Track One prioritized examination can produce a final disposition within 12 months.
What is a provisional patent application?
A provisional is a placeholder filing that establishes a priority date. It is not examined, does not become a patent on its own, and expires after 12 months if not followed by a non-provisional application.
What happens when the USPTO rejects my claims?
You respond with claim amendments, arguments, or both. Rejections are normal and expected — they do not mean your invention is not patentable.
What is prosecution history estoppel?
It is a legal doctrine that limits your ability to recapture claim scope you surrendered through amendments or arguments during prosecution. It affects how broadly courts interpret your claims during enforcement.
Can I file additional patents based on the same invention?
Yes. Continuation applications allow you to pursue new claims while sharing the priority date of the original filing, as long as the parent application remains pending.
Working with an IP Attorney During Prosecution
Patent prosecution is not a task for self-help resources. The decisions made during prosecution — which claims to narrow, how to argue against an examiner, when to file a continuation — directly determine the commercial value of the resulting patent. A poorly prosecuted patent can be invalidated, designed around, or simply too narrow to enforce against anyone who matters.
At Concourse Law Group, Katherine Sales handles patent prosecution for inventors, startups, and established businesses. The practice is exclusively intellectual property (IP) — no general legal work, no litigation on the side. Every client gets direct access to an experienced IP attorney who understands both the technical subject matter and the prosecution strategy needed to protect it.
Katherine works with clients from the initial filing decision through grant, including provisional strategy, claim drafting, office action responses, and continuation planning. The goal is not just to get a patent — it is to get a patent that is worth having.
Frequently Asked Questions
Do I need a patent attorney to file a patent application?
You can file a patent application without an attorney — this is called filing pro se. However, the claims you file determine the scope of your patent rights, and poorly drafted claims are extremely difficult to fix after filing. For any invention with real commercial value, working with a registered patent practitioner is strongly recommended.
What is the difference between a patent agent and a patent attorney?
Both are registered to practice before the USPTO and can handle prosecution. A patent attorney also holds a law degree and can advise on broader legal matters such as licensing agreements, enforcement, and IP strategy. A patent agent can draft and prosecute applications but cannot provide legal advice outside of USPTO practice.
Can I patent software?
Software is patentable when claims are drafted to pass the two-step Alice framework under 35 U.S.C. 101. Abstract ideas are not patentable, but software claims directed to specific technical improvements — faster processing, better data structures, improved computer functionality — can and do receive patents. The claim drafting approach matters enormously.
What happens if someone else patents my invention before I do?
Under the AIA first-inventor-to-file system, the first applicant to file generally wins priority. There are limited exceptions for derivation proceedings — if you can prove the other applicant derived the invention from you — but these are difficult and expensive. The practical takeaway is to file as early as possible, even if only a provisional.
How much does patent prosecution cost?
Total prosecution costs vary widely by technology area, number of office actions, and the need for continuations. Expect attorney fees and USPTO fees combined to range from $10,000 to $25,000 or more for a standard utility patent, with additional costs for each office action response, RCE, continuation, and maintenance fee cycle.
Conclusion
Patent prosecution is a multi-year process with significant strategic decisions at every stage. The choices made during claim drafting, in response to office actions, and in continuation strategy all affect what the final patent covers and how enforceable it is.
Getting prosecution right from the start is far less expensive than trying to fix it later — or discovering after grant that the patent does not cover the product your competitor brought to market. If you are ready to begin, Concourse Law Group offers consultations for inventors and startups at any stage of the process. Contact Katherine at concourselaw.com before your competitor files first.
