Patent Assertion Entities: What They Are and How Companies Actually Respond

When a company you have never heard of sends you a demand letter claiming your app or platform infringes their patent, your first instinct might be to assume it is a mistake. It usually is not. These demands often come from patent assertion entities — sometimes called PAEs or, less charitably, patent trolls — and the way they operate is different enough from ordinary patent litigation that it changes how you should think about responding.

What a Patent Assertion Entity Actually Is

A patent assertion entity is a company whose primary business is licensing patents, not making or selling products. PAEs acquire patents — sometimes from bankrupt companies, sometimes from individual inventors, sometimes from corporations pruning their portfolios — and then generate revenue by demanding licensing fees from companies they accuse of infringement.

Because PAEs do not make products, they cannot be countersued for infringing your patents. That asymmetry is the core of their leverage. A practicing competitor fears a countersuit; a PAE does not. They also tend to hold patents specifically because those patents are broad, hard to design around, or cover technology that has become widely adopted.

Not every PAE demand is legally meritless. Some PAEs hold valid, enforceable patents that genuinely read on what you are doing. Others hold patents that are weak, expired, or obviously inapplicable. The demand letter itself rarely tells you which situation you are in.

Why PAEs Target Smaller Companies and Startups

Large corporations get PAE demands too, but startups and mid-sized software companies are frequent targets for specific reasons.

The Settlement Math

PAEs often calculate their demand around what litigation would cost you, not what the patent is actually worth. Patent litigation through trial is expensive — legal fees alone routinely run into hundreds of thousands of dollars or more. A PAE offering to settle for $30,000 to $80,000 is betting you will pay rather than fight, even if the patent is weak. That bet is frequently correct.

Broad Software Patents

Software patents granted in the late 1990s and 2000s were sometimes written broadly enough to arguably cover common functionality — things like session management, push notifications, or basic e-commerce flows. PAEs accumulate these patents and assert them against many defendants simultaneously, spreading litigation costs while multiplying licensing revenue.

Limited Resources to Fight Back

A startup with six months of runway cannot easily afford the discovery process in a patent case. PAEs understand this. The pressure is designed to make settlement feel like the rational choice regardless of whether the patent is valid or infringed.

How Companies Actually Respond

There is no single right answer, but there is a range of options companies and their counsel evaluate.

Ignoring the Letter

This is rarely advisable. Ignoring a demand does not make it go away and can occasionally complicate your position later.

Evaluating the Patent and the Claim

Before doing anything else, you need to understand what the asserted patent actually claims and whether your product plausibly falls within those claims. This means reading the claims carefully — not the abstract, not the title, the actual claims — and comparing them to what you ship. This analysis is where an attorney earns their fee.

Searching for Invalidity

If the patent is weak, prior art may exist that the USPTO never saw. Inter partes review at the USPTO is one formal mechanism for challenging a granted patent. Invalidity arguments can also be raised as a defense in litigation itself. Finding strong prior art early changes your negotiating position significantly.

Negotiating a License

Many PAE disputes end in a license. The terms matter — a license that is too broad can affect future investors and acquirers, and some licenses carry most-favored-nation clauses or field-of-use provisions that create problems downstream. Never treat a PAE license as a simple payment to make something go away without reading what you are actually signing.

Litigating or Joining a Defense Group

Some companies fight. Others join organizations that pool resources to challenge PAE patents across multiple defendants. Both options exist but require resources and a legal team experienced in patent litigation.

Practical Takeaways

• A demand letter from a company you have never heard of is not automatically frivolous — take it seriously enough to evaluate it properly.
• The settlement amount in a PAE demand is usually calibrated to your litigation costs, not the patent's value; knowing this helps you negotiate.
• Read the actual patent claims before assuming the demand has merit or lacks it — the abstract and title are not the legal scope of the patent.
• Prior art searches are one of the first things a patent attorney will do when evaluating a PAE demand; strong prior art fundamentally changes your options.
• Any license you sign with a PAE becomes part of your company's IP record and can affect future due diligence — review the terms carefully before signing.
• If multiple companies in your industry have received the same demand, coordinated responses or inter partes review filings may be more cost-effective than responding alone.

This guide is general education, not legal advice, and does not create an attorney–client relationship. For your specific situation, talk to a registered patent attorney.