Hidden Leverage in Plain Sight – Reassessing Mature Patent Value in the Current Enforcement Environment

This article was originally published as a Sterne Kessler insight.

Historically, some operating companies treated older patents in their portfolio as background assets—useful for defensive signaling, occasionally relevant in licensing discussions if a particular technology later found commercial relevance, necessary to maintain good intellectual property (IP) hygiene. But many assets were treated as rarely meriting another in-depth look once issued. In the past, that approach was understandable. Enforcement outcomes felt uncertain, venues unpredictable or excessively expensive, and invalidation risk at the Patent Trial and Appeal Board (PTAB) too high compared to the potential return, so the marginal value of revisiting mature assets often seemed low. Many in-house counsel teams prioritized new filings, product‑aligned coverage, and controlling cost, which are all reasonable strategies.

However, patent portfolios do not exist in a static environment and when enforcement conditions shift, the strategic value of existing patents can increase quickly. New filings take time to work through the United States Patent and Trademark Office (USPTO), even under accelerated programs such as Track One, and so a periodic, disciplined re‑evaluation of already-existing assets can be a valuable exercise.

Even modest portfolios might contain so-called “Rembrandts in the attic”: patents that were never designed as litigation centerpieces, but that now—because of market evolution, competitor behavior, or changes in enforcement dynamics—may support meaningful deterrence or commercial leverage if properly understood and, in some cases, selectively enforced or identified for further development through continuing application practice. Dusting off patents that issued six or more years ago in view of the “settled expectations” policy development at the PTAB can add fuel to discretionary denial arguments if a patent is challenged in an inter partes review (IPR). Coupled with quick, strategically prosecuted “new” patents, enforcement in a fast-moving district court or the International Trade Commission (ITC) can be an attractive option for companies looking to minimize delay, and finding non-U.S. counterparts where competitors manufacture or sell can quickly turn into global leverage.

The goal of revisiting mature patents is not strictly to gear up for litigation. Companies that understand which assets could credibly be asserted, which can be upgraded, and which are truly maintenance‑only are better positioned to navigate unpredictable competitive dynamics. This is true no matter a company’s IP portfolio goals and can provide a meaningful audit for current and future prosecution efforts, whether the next challenge comes from a direct competitor, a disrupted supply chain, or a shifting regulatory environment.