Non-Practicing Entity

A non-practicing entity (NPE) is a patent holder that does not manufacture products or provide services based on the patents it holds. The term is neutral and descriptive — it encompasses universities, individual inventors, research foundations, corporate licensing divisions, and pure patent assertion entities (PAEs). The key characteristic is that the entity's patent portfolio is not tied to a manufacturing or services business; the entity earns revenue solely or primarily from licensing fees and litigation settlements. Universities are the most prominent 'legitimate' NPEs — MIT, Stanford, and major research institutions all license patents from their research programs and sue infringers. At the other end of the spectrum are PAEs (sometimes called 'patent trolls') that acquire low-quality or expired patents and send mass demand letters seeking nuisance settlements below the cost of litigation. The legal rights of NPEs are the same as those of operating companies — patents grant the same exclusive rights regardless of whether the holder makes products. NPEs have equal access to courts, equal ability to seek injunctions (though eBay v. MercExchange made injunctions far harder to obtain for NPEs post-2006), and equal entitlement to damages. The policy debate centers on whether NPE litigation — particularly PAE assertion campaigns — produces social value (monetizing underused patents, rewarding inventors) or harm (tax on productive industry, suppressing innovation).

'Patent troll' is a pejorative label applied to NPEs engaged in abusive patent assertion — specifically, patent assertion entities (PAEs) that acquire low-quality patents in bulk and send mass demand letters or file suits targeting many companies simultaneously, seeking nuisance settlements below the cost of litigation. The term 'patent troll' deliberately invokes predatory connotations and is used by critics of the NPE model to distinguish abusive behavior from legitimate licensing. Key differences in practice: A university NPE licenses patents arising from genuine research, seeks market-rate royalties, and sues infringers who refuse reasonable licenses. A PAE 'troll' acquires patents after the invention is already in widespread use (so the patentee cannot claim credit for inducing the innovation), sends vague demand letters asserting patents that may be invalid or obviously non-infringed, targets many defendants at low per-defendant cost (often targeting end users rather than product manufacturers), and demands settlements designed to be cheaper than the cost of a defense. The 'patent troll' label is contested. Some economists argue PAEs serve a legitimate function as intermediaries between individual inventors and markets; others argue PAEs primarily extract wealth rather than create it. Legislation (America Invents Act, Innovation Act proposals) has targeted abusive PAE behavior while attempting to avoid restricting legitimate NPE licensing.

It is very difficult for an NPE to obtain a permanent injunction against a practicing company after eBay Inc. v. MercExchange, L.L.C. (S.Ct. 2006). Before eBay, winning patent holders typically received injunctions as a matter of course. eBay held that courts must apply a four-factor test for injunctions: (1) irreparable harm; (2) inadequate remedy at law (money damages insufficient); (3) balance of hardships favoring the plaintiff; (4) public interest not disserved by the injunction. For an NPE that does not compete with the infringer and can be made whole by a reasonable royalty, showing irreparable harm and inadequate legal remedy is extremely difficult. Post-eBay courts routinely deny permanent injunctions to NPEs, awarding ongoing royalties (compulsory license rate) instead. This dramatically reduced the leverage of NPE patent assertions — before eBay, the threat of an injunction (shutting down a profitable product line) created enormous settlement pressure. After eBay, defendants know that even if they lose on the merits, the likely remedy is a court-determined royalty, not an injunction. This has made NPE assertions more predictable in outcome but less existentially threatening to defendants. Temporary restraining orders and preliminary injunctions remain possible but are equally difficult for NPEs to obtain.

A demand letter from an NPE typically asserts that your products or services infringe one or more patents and demands either (1) a licensing fee, (2) a meeting to discuss licensing terms, or (3) cessation of the allegedly infringing activity. Many state attorneys general have taken action against demand letters that are overly vague, make false representations, or are sent without a reasonable pre-suit investigation. The FTC has also investigated and taken action against abusive PAE demand letter campaigns. What to do when you receive a demand letter: (1) Do not ignore it — even if the assertion appears frivolous, ignoring a demand letter can later support a willfulness finding if the claim has any merit. (2) Engage a patent attorney to evaluate the letter and the asserted patent. (3) Obtain the file history of the asserted patent (freely available at the USPTO Patent Center) and assess validity and claim scope. (4) Evaluate whether your products actually fall within the claims. (5) Consider whether to respond, license, challenge the patent's validity (IPR), or litigate. (6) Check whether the patent was asserted against other companies — coordinated defense groups sometimes share costs. (7) If the letter is vague or the patents appear invalid, a non-response or a politely declining letter is sometimes appropriate, especially for small businesses receiving mass-mailing campaigns. 28 states have enacted laws requiring that demand letters meet minimum specificity requirements or face unfair business practice claims.