Direct comparison
Patent Prosecution vs. Patent Litigation
How patent prosecution differs from patent litigation: attorneys, timelines, and cost structures -- and why TTOs need to understand both.
Side-by-side comparison
| Dimension | Patent Prosecution | Patent Litigation |
|---|---|---|
| What it is | The administrative process of obtaining a patent: drafting, filing, and negotiating claim scope with a patent examiner until the application is allowed and issued, or abandoned. | The adversarial process of enforcing or challenging an already-granted patent: a lawsuit, or an administrative proceeding such as inter partes review, between the patent owner and an alleged infringer or validity challenger. |
| When it happens | Before grant -- starts at filing and ends at issuance or abandonment. | After grant -- only arises once a patent exists and is allegedly infringed or challenged. |
| Nature of the process | Non-adversarial. The examiner tests the application against patentability law; there is no opposing party. | Adversarial. Two opposing parties, each represented by counsel, dispute infringement, validity, or both. |
| Forum | The USPTO (or a foreign patent office) -- correspondence with an assigned examiner, entirely administrative. | Federal district court for an infringement suit, or the Patent Trial and Appeal Board (PTAB) for a post-grant validity challenge such as inter partes review (IPR). |
| Type of counsel | A registered patent attorney or patent agent admitted to practice before the USPTO -- technical fluency and precise claim drafting matter most. See <a href='/guides/patent-lawyer-requirements'>patent lawyer requirements</a> and the <a href='/guides/uspto-exam-patent-bar'>USPTO patent bar exam</a>. | A litigator, often but not always also patent-registered, with trial and evidentiary practice experience -- claim construction argument, discovery, expert-witness management, and courtroom advocacy matter most. |
| Typical timeline | Roughly one to several years from filing to issuance, depending on examiner art unit and office-action rounds. See <a href='/guides/how-long-do-patents-last'>How Long Do Patents Last?</a> | A district court infringement suit commonly runs two or more years to trial; a PTAB inter partes review runs on a statutory clock -- a final written decision is due within one year of institution, extendable up to six months for good cause (35 U.S.C. section 316(a)(11)). |
| Cost driver | Attorney drafting/filing time plus USPTO fees, scaled to entity size and claim complexity. See <a href='/guides/cost-of-filing-a-patent'>Cost of Filing a Patent</a>. | Discovery, expert witnesses, and trial preparation dominate cost, scaling with the amount at risk. Industry surveys (AIPLA's Report of the Economic Survey) commonly report total litigation cost through trial ranging from the high hundreds of thousands of dollars up to several million dollars, depending on the case. |
| What's decided | Whether a patent issues at all, and how broad its claims are. | Whether an existing patent is infringed, valid, and enforceable, and what remedy follows. |
| TTO's role | Client and portfolio manager -- decides which inventions to file and how aggressively to pursue claim scope, while outside counsel drafts and prosecutes. See <a href='/dictionary/term/patent-prosecution'>Patent Prosecution</a>. | Usually a secondary or supporting role -- enforcement is often licensee-driven, and validity challenges against a university's own patent are typically defended jointly with outside litigation counsel. |
Common questions
FAQ
Is a patent prosecution attorney the same as a patent litigator?+
Not necessarily. Only a patent attorney or patent agent registered with the USPTO may prosecute an application, while litigation is handled by attorneys admitted to the relevant court, who are often but not always also patent-registered. The two require different core skills -- claim drafting and prosecution strategy versus trial advocacy and evidentiary practice -- so many firms staff them with different specialists.
Can the same law firm handle both prosecution and litigation for a university's patents?+
Yes -- many full-service IP firms offer both practice groups. In practice, a university TTO commonly uses separate counsel, or a separate practice group within the same firm, for each function, partly because the skill sets differ and partly to avoid a conflict if the firm that prosecuted a patent is later asked to litigate its validity.
What is inter partes review, and where does it fit relative to prosecution and litigation?+
Inter partes review (IPR) is a post-grant proceeding before the Patent Trial and Appeal Board that lets a third party challenge an already-issued patent's claims on novelty or obviousness grounds. It falls within the litigation category -- it happens after grant and is adversarial -- but runs before the PTAB rather than a federal district court, on the one-year statutory decision clock.
Why does a university tech transfer office need to understand both processes?+
Prosecution decisions made early -- how broad the claims are, how the specification is drafted, what prior art is disclosed -- directly shape how defensible the resulting patent is if it is ever litigated or challenged later. A TTO with no visibility into litigation risk can end up with a portfolio that is procedurally complete but weak in the one place it is actually tested.
