[Audio] Subject Matter Eligibility Challenges in Post-Grant Proceedings — Patents: Post-Grant Podcast

Why It Matters

Section 101 challenges in PGR can invalidate patents early, reshaping portfolio risk and litigation strategy for technology firms.

Key Takeaways

• PGR offers nine‑month filing window after patent issuance
• Broad estoppel can block later infringement suits
• Section 101 challenges increasingly viable in post‑grant
• USPTO issued new memos clarifying eligibility analysis
• Strategic timing crucial for effective PGR defense

Pulse Analysis

Section 101 has become a pivotal battleground for patent owners and challengers alike. After landmark Supreme Court decisions such as *Alice Corp.* and *Mayo*, courts have tightened the definition of patent‑eligible subject matter, especially for software and biotech inventions. Companies now face heightened scrutiny when their patents are examined for abstract ideas or natural phenomena, prompting many to reassess the strength of their portfolios before they reach the market.

Post‑grant review offers a unique window to contest a patent’s eligibility within nine months of issuance. This early‑stage forum not only allows the USPTO to re‑evaluate claims under the latest eligibility standards but also imposes a broad estoppel that can prevent the patent owner from later asserting infringement. Recent USPTO memoranda, including the "Reminders on Evaluating Subject Matter Eligibility" and the notice of MPEP changes after *Ex Parte Desjardins*, provide clearer criteria for examiners and practitioners, making PGR a more predictable, though still high‑stakes, avenue for challengers.

For businesses, the convergence of stricter Section 101 jurisprudence and refined PGR procedures means proactive patent strategy is essential. Firms should monitor USPTO guidance, align filing timelines with product launches, and consider defensive PGR filings to safeguard critical technology. Early eligibility challenges can save millions in litigation costs and preserve market freedom, while missed opportunities may leave patents vulnerable to later invalidation. Staying ahead of these developments positions companies to manage risk and maintain competitive advantage in an increasingly litigious IP landscape.