Navigating Patent Assertion Entity Litigation: Finding the Right Defense Counsel
NPE lawsuits surged roughly 20% in 2025, driven partly by reduced PTAB discretionary denials that embolden assertion entities to file in district court. Over half of all NPE targets have annual revenues under $25 million — meaning startups and mid-market companies bear disproportionate risk from demand letters that can escalate to seven-figure litigation costs before trial.
What Separates Effective NPE Defense Counsel
Not every patent litigator understands the economics of troll litigation. The best NPE defense firms share several traits:
- PTAB Fluency
- Inter partes review (IPR) petitions at the Patent Trial and Appeal Board remain the most powerful tool for invalidating weak patents. Firms like Fish & Richardson (471 PTAB cases, 2019–2021), Finnegan (293 cases), and Sterne Kessler (271 cases) dominate this space because they combine technical depth with procedural mastery.
- Multi-District Reach
- NPEs forum-shop aggressively — the Eastern District of Texas, Western District of Texas, and District of Delaware account for the majority of filings. Defense firms operating across 20+ districts can respond without local counsel delays.
- Early Case Assessment
- Experienced firms quickly evaluate claim scope, prior art landscape, and settlement economics to determine whether to fight, challenge at PTAB, or negotiate — avoiding the trap of over-litigating weak claims or under-fighting strong positions.
Key Defense Strategies
| Strategy | When to Use | Typical Timeline |
|---|---|---|
| IPR at PTAB | Weak prior art position of asserted patent | 12–18 months |
| Alice/§101 Motion | Software or business method patents | 3–6 months |
| Early Markman Hearing | Narrow claim construction favors defendant | 6–12 months |
| Declaratory Judgment | Pre-empt suit in favorable jurisdiction | Varies |
| Joint Defense Group | NPE targeting multiple defendants in same campaign | Ongoing |
Cost Considerations
Patent litigation typically costs $1–5 million through trial, but NPE defense firms increasingly offer alternative fee arrangements — flat fees for PTAB petitions, blended rates for early-stage defense, and success-based structures. Organizations like RPX and Unified Patents also provide collective defense mechanisms, with RPX purchasing patents preemptively and Unified filing IPRs on behalf of member companies.