Patent Litigation vs. Prosecution: What Is the Difference?

Patent prosecution and patent litigation are two distinct legal processes that serve completely different purposes in protecting intellectual property. Patent prosecution is the process of obtaining a patent through the United States Patent and Trademark Office. Patent litigation is the process of enforcing or defending a patent in federal court. One happens before a patent exists. The other happens when a patent right is disputed. Baker Law Group, PLLC represents inventors, entrepreneurs, and businesses across the country in patent litigation matters, with attorneys who understand the full lifecycle of patent protection from application through enforcement.

This page explains what patent prosecution involves, what patent litigation involves, how the two differ, and when litigation becomes necessary.

What Is Patent Prosecution?

Patent prosecution is the legal process of applying for a patent and working with the USPTO to obtain patent protection for an invention. The term prosecution refers to the back-and-forth communication between the patent applicant and the USPTO examiner who reviews the application, not to any courtroom proceeding.

The patent prosecution process begins when an inventor or their attorney files a patent application with the USPTO. The application must describe the invention in sufficient detail, include claims that define the legal boundaries of the patent protection sought, and meet all formal USPTO requirements. The quality of the claims is the most consequential element of the application since they determine exactly what the patent covers and what competitors can and cannot do.

After filing, a USPTO patent examiner reviews the application and issues an office action, which typically raises objections or rejections to some or all of the claims. The applicant’s attorney responds to the office action, arguing against rejections, amending claims, or both. This exchange can go through multiple rounds before the examiner allows the application or issues a final rejection.

Patent prosecution requires a USPTO-registered patent practitioner, either a patent attorney or a patent agent. Registration requires passing the USPTO’s patent bar examination, which tests knowledge of patent law and USPTO procedures. Not all attorneys are registered to practice before the USPTO. Choosing a practitioner who is registered and experienced in your specific technology area significantly affects the quality of protection you obtain.

The outcome of successful prosecution is a granted patent that gives the holder the right to exclude others from making, using, selling, or importing the patented invention for a defined period, typically twenty years from the filing date for utility patents.

For a detailed walkthrough of the patent application process, how to file a patent covers the steps involved from invention disclosure through USPTO filing.

What Is Patent Litigation?

Patent litigation is the legal process of resolving patent disputes in federal court. It arises when the rights established by a granted patent are challenged or infringed. Unlike patent prosecution, which is an administrative process conducted before the USPTO, patent litigation is adversarial courtroom litigation governed by the Federal Rules of Civil Procedure and federal patent statutes under 35 U.S.C.

The most common form of patent litigation is an infringement lawsuit, where the patent holder sues a party who is allegedly making, using, selling, or importing a product or process that falls within the scope of the patent’s claims without authorization. Patent litigation can also arise in the form of declaratory judgment actions, where a party accused of infringement sues the patent holder first to have the court declare that their product does not infringe or that the patent is invalid.

Patent litigation cases are filed exclusively in federal district courts since patent law is a matter of federal jurisdiction. Appeals from district court decisions go to the Court of Appeals for the Federal Circuit, which has exclusive appellate jurisdiction over patent cases nationwide. This means the same substantive law and appellate standards apply regardless of which federal district court hears the case.

Patent litigation is among the most complex and expensive forms of civil litigation. Cases regularly involve millions of dollars in dispute, highly technical subject matter requiring expert testimony, extensive discovery of technical documents and communications, claim construction hearings where the court interprets the patent’s claims, and trials that can last weeks. The average cost of patent litigation through trial runs into the millions of dollars for each side.

Our attorney at Baker Law Group, PLLC, is a USPTO-registered patent attorney who handles patent litigation matters for the firm. Our attorney’s technical background and deep knowledge of patent law gives clients the combination of subject matter expertise and litigation skill that patent cases demand across every federal jurisdiction where Baker Law Group represents clients.

A patent litigation lawyer at Baker Law Group, PLLC represents patent holders and accused infringers in federal courts nationwide and before the USPTO’s Patent Trial and Appeal Board.

Patent Prosecution vs. Patent Litigation: Key Differences

The distinction between prosecution and litigation comes down to four fundamental differences.

Purpose. Patent prosecution creates patent rights. Patent litigation enforces or challenges patent rights that already exist. You cannot litigate a patent that has not yet been granted, and prosecution becomes unnecessary once the patent is either granted or abandoned.

Forum. Patent prosecution takes place before the USPTO, an administrative agency of the federal government. Patent litigation takes place in federal district courts. The rules, procedures, and standards that apply in each forum are entirely different.

Who is involved. Patent prosecution involves the applicant, their attorney, and the USPTO examiner. Patent litigation involves the patent holder, the accused infringer, their respective legal teams, technical experts, and a federal judge and potentially a jury.

Cost and timeline. Patent prosecution typically costs between $10,000 and $30,000 or more depending on the complexity of the invention and the number of office action rounds, and can take two to five years from filing to grant. Patent litigation typically costs hundreds of thousands to millions of dollars per side and can take three to five years from filing to trial depending on the court and the complexity of the case.

Skill requirements. Both require specialized legal knowledge but in different domains. Patent prosecution requires deep knowledge of USPTO practice and procedures, claim drafting strategy, and the technical subject matter of the invention. Patent litigation requires courtroom litigation skills, federal civil procedure expertise, evidence and discovery management, and the ability to communicate complex technical concepts to judges and juries.

When Is Patent Litigation Necessary?

Patent litigation becomes necessary when a patent right is being infringed and the infringer will not stop voluntarily, or when a patent is being asserted against you and you need to defend against it. Neither outcome is automatic. Both require deliberate legal strategy and a realistic assessment of the costs and likely outcomes before filing or responding to a lawsuit.

The most common situations that lead to patent litigation include the following.

Competitor infringement. A competitor is selling a product or using a process that falls within the claims of your granted patent without a license. After sending a cease and desist letter or demand for licensing that the competitor ignores or refuses, litigation may be the only path to stopping the infringement and recovering damages.

Licensing disputes. A licensee is not paying royalties, is using the patent outside the scope of the license, or disputes the validity of the patent altogether. When licensing negotiations break down, litigation resolves the dispute.

Infringement claims against you. A patent holder asserts that your product or process infringes their patent and demands royalties or that you stop selling. You may need to litigate to challenge the validity of the patent, argue non-infringement, or negotiate a resolution from a position of strength.

Inter partes review. Inter partes review is an administrative proceeding before the USPTO’s Patent Trial and Appeal Board that allows a party to challenge the validity of a granted patent. While not traditional court litigation, IPR proceedings are adversarial and require skilled legal representation. They are often filed in parallel with or as an alternative to district court litigation.

Before pursuing patent litigation, a realistic assessment of the strength of the patent’s claims, the scope of the alleged infringement, the financial resources of both parties, and the likely damages or injunctive relief available is essential. Litigation that costs more than the potential recovery is rarely worth pursuing regardless of how strong the infringement case appears.

What patent infringement means explains the specific legal standard courts apply when evaluating infringement claims, which is the foundational question in any patent litigation decision regardless of the jurisdiction where the case is filed.

Your Patent Rights Deserve Aggressive Enforcement. We Are Ready to Fight for Them.

A granted patent gives you the right to exclude others. It does not automatically stop anyone from infringing. Enforcing that right requires legal action. Baker Law Group, PLLC focuses its patent practice on litigation, representing both patent holders pursuing infringers and businesses defending against infringement claims in federal courts nationwide.

Whether you are a patent holder whose rights are being violated or a business facing an infringement claim, our attorneys give you a direct assessment of your litigation position and a clear strategy for protecting your intellectual property in court.

Contact Baker Law Group, PLLC today to schedule a confidential consultation with a patent litigation lawyer and find out exactly where your patent rights stand and what it takes to protect them.