IP litigation is the legal process of resolving disputes over intellectual property rights — patents, trademarks, copyrights, and trade secrets — whether in federal court, before a specialized administrative board, or at the International Trade Commission. These cases decide who owns a creation, whether someone copied it, and what the copier owes. They are expensive and slow: median costs for even lower-stakes patent disputes exceed $1 million per side, and a typical case runs two to four years from complaint to final judgment. The procedure, deadlines, and available remedies all shift depending on which type of intellectual property is at stake.
What IP Litigation Covers
The four categories of intellectual property each come with their own rules, and the type of right drives nearly every strategic decision that follows.
Patents give an inventor exclusive control over who makes, uses, sells, or imports an invention. Utility patents last 20 years from the application filing date.1United States Patent and Trademark Office. MPEP 2701 – Patent Term Design patents, which cover ornamental appearance, last 15 years from grant.2Office of the Law Revision Counsel. 35 USC 173 – Term of Design Patent Plant patents form a third category.
Trademarks protect brand identifiers — names, logos, slogans — that signal to consumers where a product comes from. Trademark rights can last indefinitely, but only if the owner keeps using the mark in commerce and files required maintenance documents at the USPTO: a declaration of continued use between years five and six, a combined use declaration and renewal between years nine and ten, and renewals every ten years after that.3United States Patent and Trademark Office. Keeping Your Registration Alive Miss a deadline and the registration dies.
Copyright protects original creative works the moment they are fixed in tangible form.4U.S. Copyright Office. Copyright Registration Toolkit But protection is not the same as the right to sue. You generally cannot file a copyright infringement case in federal court until the work has been registered (or registration has been refused) with the U.S. Copyright Office.5Office of the Law Revision Counsel. 17 US Code 411 – Registration and Civil Infringement Actions Registration also unlocks statutory damages and attorney fees, which is why it matters even for works protected the moment they are created.
Trade secrets cover confidential business information — a formula, a customer list, a process — that gives the owner a competitive edge because outsiders don’t know it. There is no registration. Protection lasts only as long as the information actually stays secret and the owner takes reasonable steps to keep it that way.6United States Patent and Trademark Office. Intellectual Property Toolkit – Trade Secrets Once the secret escapes, the protection is gone permanently.
What People Actually Fight About
Most IP cases fall into three recurring buckets. Identifying which one you have determines what you need to prove.
Infringement
Infringement is the core of IP litigation. In patent cases, infringement means making, using, selling, offering to sell, or importing a patented invention without permission.7Office of the Law Revision Counsel. 35 USC 271 – Infringement of Patent Trademark infringement turns on likelihood of confusion: would another party’s use of a similar mark confuse consumers about who stands behind a product. Copyright infringement involves reproducing, distributing, performing, or displaying a protected work without authorization.
Copyright defendants often raise fair use. Four statutory factors control the analysis: the purpose and character of the use (commercial versus nonprofit or educational), the nature of the copyrighted work, how much was used relative to the whole, and the effect on the market for the original.8Office of the Law Revision Counsel. 17 USC 107 – Limitations on Exclusive Rights: Fair Use No single factor is decisive. A use that transforms the original into something with a different purpose stands on the firmest ground.
Validity Challenges
Sometimes a defendant attacks the IP right itself instead of arguing non-infringement. A patent can be challenged as invalid if the invention was already publicly known before the filing date or would have been obvious to someone skilled in the field.9Office of the Law Revision Counsel. 35 USC 102 – Conditions for Patentability: Novelty A trademark registration can be attacked as merely descriptive or as having become generic. These challenges can be raised as defenses in court or pursued separately in administrative proceedings at the USPTO.
Ownership Disputes
Fights over who owns a piece of IP are more common than most people expect. They arise between co-inventors, between employers and departing employees, and between companies after mergers where IP assignments were drafted sloppily. The usual root cause is a missing or vague written agreement about who owns what.
Where IP Cases Are Decided
Not every IP dispute lands in the same forum. The right at issue and the nature of the problem determine who has authority to hear it.
Federal District Courts
Federal district courts handle most IP litigation. Federal courts have exclusive jurisdiction over patent and copyright claims; state courts cannot hear them at all.10U.S. Copyright Office. 28 USC 1338 – Patents, Plant Variety Protection, Copyrights, Mask Works, Designs, Trademarks, and Unfair Competition Trademark cases can be filed in state or federal court, but most go federal because the Lanham Act offers stronger remedies. Patent suits must be filed in the district where the defendant resides or where it has committed infringement and has a regular, established place of business.11Office of the Law Revision Counsel. 28 US Code 1400 – Patents and Copyrights, Mask Works, and Designs
The Court of Appeals for the Federal Circuit
Patent appeals go exclusively to the Court of Appeals for the Federal Circuit in Washington, D.C., not to the regional circuit courts.12Office of the Law Revision Counsel. 28 US Code 1295 – Jurisdiction of the United States Court of Appeals for the Federal Circuit This specialized court was created to produce nationwide consistency in patent law. Copyright and trademark appeals, by contrast, go to whichever regional circuit covers the district court below.
International Trade Commission
When infringing products are being imported into the United States, the IP owner can file a Section 337 complaint at the International Trade Commission. If the ITC finds a violation, it can issue an exclusion order directing U.S. Customs to block the goods at the border.13United States International Trade Commission. About Section 337 ITC proceedings move faster than district court cases and are especially useful against overseas manufacturers who may be hard to reach in a U.S. court.
USPTO Administrative Boards
The Patent Trial and Appeal Board (PTAB) reviews whether issued patents are valid. The most common vehicle is inter partes review, where a challenger argues the invention was already known or obvious.14United States Patent and Trademark Office. Inter Partes Review Once the PTAB institutes the case, it must issue a final decision within 12 months, with a possible six-month extension. That timeline makes PTAB a popular tool for defendants hit with a patent infringement suit.
On the trademark side, the Trademark Trial and Appeal Board (TTAB) handles oppositions to new applications and petitions to cancel existing registrations.15United States Patent and Trademark Office. Trademark Trial and Appeal Board The TTAB decides whether a mark should be registered or stay registered. It cannot award damages or issue injunctions.
How a Case Actually Moves
A typical IP case in federal court moves through several distinct phases over roughly two to four years. Most of the money is spent well before trial.
Filing and Response
The plaintiff files a complaint identifying the IP rights at issue and the relief sought. The defendant then either answers point by point or moves to dismiss on legal grounds. If the court denies the motion to dismiss, the defendant files an answer and the case proceeds.
Discovery
Discovery is where cases are won and lost, and it is routinely the most expensive phase. Both sides exchange internal documents, respond to written questions, and sit for depositions. In patent cases, document volumes can be enormous. Expert witnesses prepare detailed reports on technical questions (does the accused product infringe?) and financial ones (what is the harm worth?). Discovery often stretches a year or more, and disputes over what must be produced regularly land in front of the judge.
Claim Construction in Patent Cases
Patent litigation has a step the other IP cases don’t: claim construction, often called a Markman hearing. The judge interprets the specific language of the patent claims to define what the patent actually covers. This is frequently the pivotal moment in a patent case, because how the claims are read determines whether the accused product falls inside their scope. Many patent cases settle shortly after claim construction, once both sides can see which way the case is tilting.
Summary Judgment
After discovery closes, either side can ask the court to decide the case, or specific issues within it, without a trial. Summary judgment is granted when there is no genuine dispute about the material facts and the moving party is entitled to win as a matter of law.16Legal Information Institute. Rule 56 – Summary Judgment A summary judgment motion must be filed no later than 30 days after discovery closes unless the court orders otherwise. If the motion fails, the case heads to trial.
Trial
IP trials are heard by a jury or by a judge alone. The plaintiff puts on infringement and damages evidence, the defendant presents its defenses, and each side calls experts. Patent trials typically run a week or two; trademark and copyright trials are usually shorter. Jury trials are common in IP cases, especially when significant damages are on the line.
Appeal
The losing party can appeal. Patent appeals go to the Federal Circuit, which reviews both the legal rulings and whether sufficient evidence supported the verdict. Once briefed, Federal Circuit cases are typically calendared for oral argument during the first full week of the month.17United States Court of Appeals for the Federal Circuit. The Life of an Appeal A dissatisfied party can petition for rehearing en banc and ultimately seek Supreme Court review, though the Court takes very few IP cases each term.
Deadlines That Can End a Case
Waiting too long to sue can cost you the case or sharply limit what you can recover. The deadlines vary by IP type.
- Patents: no deadline to sue during the life of the patent, but damages are available only for infringement that occurred within six years before you filed. Every year of delay is a year of damages lost.18Office of the Law Revision Counsel. 35 USC 286 – Time Limitation on Damages
- Copyrights: three years from when the claim accrued.19Office of the Law Revision Counsel. 17 US Code 507 – Limitations on Actions
- Trade secrets: three years from when the misappropriation was discovered or should have been discovered through reasonable diligence under the federal Defend Trade Secrets Act. A continuing misappropriation counts as a single claim for limitations purposes.20Office of the Law Revision Counsel. 18 US Code 1836 – Civil Proceedings
- Trademarks: the Lanham Act has no specific statute of limitations. Federal courts borrow from analogous state statutes and apply the equitable doctrine of laches, asking whether the owner waited unreasonably long and whether the delay prejudiced the defendant. Because trademark infringement is treated as ongoing, delay does not automatically bar suit, but it can limit remedies for past harm.
What the Winner Gets
If the IP owner prevails, several forms of relief are on the table. Which ones actually land depends on the evidence, the type of right, and whether the infringement was deliberate.
Injunctions
An injunction orders the infringer to stop. Courts can grant a preliminary injunction early in the case or a permanent injunction after trial.21Office of the Law Revision Counsel. 15 US Code 1116 – Injunctive Relief Injunctions are not automatic even when infringement is proven. The Supreme Court requires a patent holder to show irreparable harm, that money damages are inadequate, that the balance of hardships tips in their favor, and that the public interest would not be harmed.
Monetary Damages
The baseline patent remedy is damages adequate to compensate for the infringement, never less than a reasonable royalty.22Office of the Law Revision Counsel. 35 USC 284 – Damages If the patent holder can prove lost sales, lost profits may be available instead, which are often much larger. Reasonable royalty calculations are notoriously complex; courts commonly weigh fifteen Georgia-Pacific factors to reconstruct what the parties would have agreed to in a hypothetical licensing negotiation at the time infringement began.
In trademark cases, a winning plaintiff can recover the defendant’s profits, actual damages, and the costs of the action.23Office of the Law Revision Counsel. 15 USC 1117 – Recovery for Violation of Rights Copyright owners can choose between actual damages (plus the infringer’s profits) or statutory damages ranging from $750 to $30,000 per work infringed, as the court finds just.24Office of the Law Revision Counsel. 17 USC 504 – Remedies for Infringement: Damages and Profits Statutory damages are especially valuable when actual harm is hard to quantify.
Enhanced Damages for Willful Infringement
Deliberate infringement escalates the financial exposure. In patent cases, the court can increase damages up to three times the amount found.22Office of the Law Revision Counsel. 35 USC 284 – Damages Courts reserve the maximum for the most egregious cases and have broad discretion over whether to enhance at all. In trademark cases involving counterfeit marks, the court must award treble damages or treble profits (whichever is greater) unless extenuating circumstances exist.23Office of the Law Revision Counsel. 15 USC 1117 – Recovery for Violation of Rights For copyright, willful infringement can push statutory damages up to $150,000 per work.24Office of the Law Revision Counsel. 17 USC 504 – Remedies for Infringement: Damages and Profits
Attorney Fees
The default American rule is that each side pays its own attorney fees. IP law creates an exception: in “exceptional” cases, the court can award reasonable attorney fees to the prevailing party in patent and trademark litigation.23Office of the Law Revision Counsel. 15 USC 1117 – Recovery for Violation of Rights The Supreme Court has defined an exceptional case as one that stands out from the pack based on the weakness of a party’s legal position or the unreasonable way the case was litigated. Litigation misconduct, frivolous claims, and inequitable conduct during the patent application process all push a case toward exceptional status. Even then, the award is discretionary.
Settlement
Most IP cases settle before verdict. Settlements often take the form of a license agreement with ongoing royalties, a lump-sum payment, or an agreement to stop the challenged activity. Expense, duration, and unpredictability all push both sides toward negotiation. Cases often settle right after a defining ruling (claim construction in a patent case, or the denial of a motion to dismiss) clarifies where each side stands.
What IP Litigation Costs
IP litigation is expensive by any measure, and the costs scale with what’s at stake. Industry surveys consistently show that in patent cases with less than $1 million at risk, median total costs through trial and appeal run roughly $600,000 to $700,000 per side. When the amount in controversy climbs above $25 million, median costs can exceed $4 million per side. Copyright cases tend to run cheaper but still commonly exceed $1 million per side when significant damages are involved. Trade secret and trademark cases fall in between.
Discovery consumes the largest share of the budget. Document review, depositions, and expert reports account for the majority of legal fees in nearly every IP case. The quality of expert witnesses often matters more than any other single variable: technical experts explain how an accused product works and whether it falls within a patent’s scope, while financial experts build the damages models that can swing a verdict by millions. That cost reality explains both why settlement is so common and why faster alternatives like PTAB proceedings have become popular ways to resolve the validity question without paying for a full district court trial.