What is a Patent Assertion Entity?
How PAEs acquire and assert patents, the difference between a PAE and other non-practicing entities, what to do with a demand letter, and how to lower your exposure before one arrives.
Definition
A patent assertion entity (PAE) is a company whose business is acquiring patents and generating revenue by licensing or litigating them against operating companies, rather than by making or selling products. PAEs are a subset of non-practicing entities (NPEs) and are the entities usually meant by the term "patent troll."
Key Facts
- Share of litigation: NPEs have filed roughly half or more of US district court patent cases in most recent years, concentrated in software, e-commerce, networking, and mobile
- Business model: Buy patents cheaply, often from bankrupt or exiting companies, then assert against many defendants at once and settle below the cost of defense
- Venues: Historically the Eastern and now the Western District of Texas, with Delaware and the ITC also common
- Cost of defense: Defending a patent case through trial commonly costs seven figures, which is the leverage behind five- and six-figure settlement demands
- Main defenses: Inter partes review at the Patent Trial and Appeal Board, § 101 motions to dismiss, and non-infringement based on claim construction
- Not all NPEs are PAEs: Universities, research institutes, and individual inventors also license without practicing
How a PAE Campaign Works
- Acquire: Purchase a portfolio, frequently old software or telecom patents with broad claims, sometimes through a chain of shell entities
- Target: Identify companies whose public products or websites appear to practice the claims, often dozens at a time
- Demand: Send letters or file suits offering a license for less than the cost of responding
- Settle: Most defendants settle; a few fight, and their results shape the rest of the campaign
- Repeat: Move to the next portfolio or the next set of defendants
Responding to a Demand Letter
Do not ignore it, and do not pay reflexively. Confirm the patent is in force and that maintenance fees were paid, read the independent claims against the accused feature, check the prior art and the prosecution history, and find out who else has been targeted and how those cases ended. A weak patent asserted against many companies is often being challenged already, and joining or following an existing inter partes review is far cheaper than starting one.
Lowering Exposure
- Monitor: Track assertion activity in your technology space and watch which portfolios are changing hands
- Prior art readiness: Maintain searchable prior art on your own core technology so a challenge can be mounted quickly
- Defensive portfolios and cross-licenses deter operating-company suits but do nothing against a PAE, which has no products to counter-assert against
- Collective defense: Join a defensive aggregator or industry group that buys or licenses patents before they reach PAEs
- Insurance: Patent defense coverage for companies too small to self-insure
ArcPrime's litigation intelligence tracks which entities are asserting which families, against whom, and with what outcomes, and its patent invalidation tooling finds the art for a challenge when a letter does arrive.
Frequently Asked Questions
Don't see the answer you're looking for?
Feel free to reach out to us for more info.
Are all NPEs patent trolls?
No. Non-practicing entities include universities, research institutes, and individual inventors who license inventions they developed. "Patent troll" usually refers to patent assertion entities that buy patents from others solely to assert them, and the distinction matters in policy debates and in how courts view the plaintiff.
What should I do if I receive a PAE demand letter?
Take it to patent counsel promptly, preserve documents, and do not respond substantively before the patent has been evaluated. Check that the patent is in force, compare the claims to the accused product, review prior art and prosecution history, and find out who else has been targeted. Many letters are sent broadly and the patent may already be under challenge.
Why do companies settle with PAEs?
Because defending a patent case through trial commonly costs seven figures, while the demand is often five or six. Settling can be rational even against a weak patent, which is what makes the model work. Companies that fight early and win, especially through inter partes review, become less attractive targets.
Does having my own patents protect against PAEs?
No. A defensive portfolio deters operating companies, which fear counter-assertion, but a PAE makes no products and cannot be counter-sued for infringement. Protection against PAEs comes from validity challenges, prior art readiness, monitoring, collective defense, and insurance.
What is inter partes review?
A proceeding at the Patent Trial and Appeal Board in which a challenger asks the USPTO to cancel patent claims as anticipated or obvious over patents and printed publications. It is faster and cheaper than litigating invalidity in court, and a petition filed within a year of being sued is the standard first response to a PAE suit.
Power Every Patent Decision
With One Platform
See how ArcPrime connects your portfolio, workflows, and business context to help your team make better decisions across the patent lifecycle.