Patent Pruning Is Not Optional: Why Portfolio Discipline Must Be a Core IP Function

Most patent portfolios are overbuilt and under-managed. That is not a criticism of any particular company or patent department. It is simply the predictable result of how patent portfolios are created. Companies innovate. Business leaders demand more filings. Engineers generate invention disclosures. Outside counsel prosecute applications. Patents issue. Then years pass, products change, markets move on, competitors pivot, and strategic priorities evolve. Often—if not frequently—the patent portfolio remains the same, as if legacy assumptions and strategy remain relevant even though they no longer match business or market realities.

That is how zombie patents are created. Zombie patents are not necessarily bad patents in the abstract, and they may in fact be high quality patents. Many were perfectly rational filings at the time, covering technology that once mattered. Others may have been tied to business initiatives that looked promising but never matured or at least didn’t progress as hoped. Some may have been filed because the company was in a high patenting cycle, or were filed to respond to competitive pressure, investor expectations, or even direction from the C-suite to build a larger patent portfolio. But eventually, at least some percentage of those patents lose strategic relevance.

The problem is that too many companies continue paying for those assets long after they have stopped serving a meaningful business purpose. The result is a portfolio that looks impressive on paper but is thin where it matters. And if they are continually maintained they are doing nothing more than draining precious resources for now valid business reason. They are walking dead and siphoning the life out of dwindling patent budgets—or in other words, zombie patents.

Patent Pruning is a Strategic Imperative

The patent system creates a built-in portfolio-management problem. The decision to file is made early, when the business case is often incomplete. The decision to maintain comes later, when better information should be available. But in far too many organizations, those later decisions are handled with less rigor than the original filing decision, which is exactly backwards.

When a company files a patent application, it is making a bet on the future with imperfect knowledge. This imperfect knowledge is often a lack of insight into technology development, product rollout, competitors with substitute products, and interest in the consuming market. But by the time maintenance fees are paid there is much greater visibility into technology, competitor landscape, and market acceptance. And by the time a patent reaches the later years of its life, the company should know far more than it knew at filing, and more than it knew at any intermediate step up to that point. And yet the default in many organizations is still to keep paying unless someone affirmatively says stop.

The default decision to pay to keep patents is expensive. It is also strategically lazy. It becomes an acute problem for many companies because patent costs are heavily backloaded. The longer a company carries patents, the more expensive the decision becomes. In the United States, the major maintenance-fee decision points are spaced out over the life of the patent, but globally the annuity burden can become a recurring annual drain that only gets more expensive year after year. For multinational portfolios, particularly those with broad foreign filing strategies, the cumulative cost can be enormous.

By the time a company finally admits that a family no longer matters, it may have spent years paying to preserve rights that were functionally dead in a business sense for quite some time. That money is not merely wasted. It had an opportunity cost. Every dollar spent maintaining a low-value asset is a dollar not spent building the next generation of the portfolio.

Volume Is Not Strategy

Many portfolios are the product of patenting waves. A company decides it needs more patents. There are a variety of reasons this can happen, ranging from preparing for an IPO, to executives realizing competitors have larger portfolios, to the business is entering a new market and wanting greater protections. Whatever the case, the directive comes down: patent more. And if you tell your patent team to patent more, the result is easy to predict. If you demand more patents, you will get more patents. Now, they might not be high quality patents, but the accumulation of patents is easy—the hard part is accumulating strong, broad coverage that is and remains relevant to the business long-term.

This is not to suggest that filing patent applications and growing a portfolio is a bad move. Companies that innovate should protect what they create. In many industries, failing to build a patent portfolio is corporate malpractice. But a volume-based filing push creates downstream consequences. Five, seven, and ten years later, the company is staring at maintenance-fee obligations worldwide tied to decisions made under a different strategic mandate. Again fine, unless you just blindly pay without asking critical business questions to ascertain whether the patent or patent family remain valid and investable.

Patent pruning is an essential part of every patent program. A portfolio built during a growth phase cannot be managed indefinitely as if every asset remains equally important, because that simply won’t ever be true. It is not enough to say, “We spent money getting this patent, so we should keep it.” Historical investment does not justify paying good money to keep low quality and/or irrelevant assets.

The better question for patent owners to ask is this: knowing what we know today, would we spend money to acquire or protect this asset now? If the answer is no, the company needs a good reason to keep paying. Absent some important countervailing consideration, paying to keep the asset or family is a waste of resources.

Pruning Requires More Than a Spreadsheet

Responsible pruning is not simply a matter of sorting assets by maintenance-fee due date and cutting the bottom 20%. That kind of blunt-force approach may satisfy a short-term budget mandate, but it is not portfolio management. It is triage by panic and calculated to lead to expensive mistakes that cannot be undone.

A real pruning process requires a structured decision-making framework. At a minimum, companies should evaluate assets across multiple dimensions.

First, does the asset support the current business? That means more than asking whether the patent covers a current product. It includes whether it protects a platform, a feature, a workflow, a manufacturing process, a data architecture, a customer-facing capability, or a strategic technology area.

Second, does the asset support the future business? This is a harder question and can be where pruning decisions become dangerous. Some patents may not matter today but may still be aligned with where the company is going. That is why input from R&D, product leadership, technical strategy, and business units is essential. Patent lawyers cannot and should not make these calls in a vacuum. A team collaborating from a variety of different viewpoints can dramatically improve decision-making and cut down on sill, irretrievable mistakes.

Third, what is the quality of the legal right today? A patent may be business-relevant but still weak. So, ask whether the claims broad enough to matter? Are they likely to survive challenge? Are there patent eligibility problems? Are there enablement or written description vulnerabilities? And the answer to these legal questions have shifted over time, at least in the United States, where changes to substantive patent law have been fast, furious and always retroactive.

Fourth, is infringement detectable? A claim that requires discovery to prove infringement may still have value, but it is a very different asset from one that can be mapped from public information, product documentation, standards materials, marketing materials, or observable functionality. Whether you might want to sell a patent, family or portfolio, or whether you want to monetize yourself through licensing and enforcement, detectability matters enormously.

Fifth, does the asset have value to someone else? A patent may no longer be core to the company but may have licensing or sale potential. In some cases, assets that are non-core internally may be highly relevant to competitors, suppliers, vendors, adjacent market participants, or companies building in a related technology space. Before abandonment, companies should always ask whether divestiture or licensing is realistic.

Sixth, are there external obligations? This is often overlooked. Government funding, university licenses, joint development agreements, standards commitments, investor obligations, NGO funding, and collaboration agreements may all create restrictions or notice obligations before rights are abandoned or transferred. The pruning decision cannot be made solely by looking at a patent or the patent family in isolation without taking into consideration the possible existence of external obligations.

Data Helps, But It Does Not Replace Judgment

One of the most important developments in portfolio management is the growing availability of analytics. Companies no longer need to rely exclusively on gut instinct, anecdote, or whoever responds loudest to the question about whether an asset or family is worth keeping. Patent data can identify patterns, flag assets for review, benchmark behavior against peers, and help companies understand where pruning typically occurs.

If analytics suggest that a particular family is low impact, lightly cited, poorly aligned with market coverage, or inconsistent with peer maintenance behavior, that should trigger some kind of internal review. It does not automatically mean a decision to automatically abandon is appropriate, but it does mean there are questions that must be answered. Conversely, if an asset has strong objective signals, broad market coverage, meaningful citation activity, and alignment with competitive activity, the company should be very careful before letting it go.

Data is especially useful because internal portfolio discussions are often distorted by emotion. Inventors naturally believe their inventions matter. Business units may resist admitting that a project failed. Patent attorneys may be reluctant to recommend abandonment of assets they prosecuted. Executives may have patents tied to their own work. No one wants to be the person who killed a patent that later turned out to matter, which is why it is human nature to pay long past the useful life of an asset.

Portfolio management cannot be governed by sentiment. Objective data gives everyone a common baseline. It does not end the debate, but it improves the quality of the debate. It allows the IP team to say: here is what the external evidence suggests; here is how this asset compares to others; here is how competitors behave; here is where the cost curve is heading; now let’s decide whether there is a strategic reason to keep it because of or despite the data.

The Hardest Part Is Governance

Patent pruning is ultimately a governance problem. The legal analysis is important, but the real challenge is building a process that produces timely, informed, and defensible decisions.

A disciplined pruning program should operate on a regular cadence, not at the last minute. Quarterly review can work for many organizations. Larger portfolios may require monthly workflows. The key is to have early conversations, so decisions are made before the deadline pressure becomes overwhelming.

Companies should also define who gets a vote and who gets a voice. Too few stakeholders create risky decisions because important business context may be missed. Too many stakeholders create paralysis. The right model usually includes the IP team, a relevant business or product owner, someone with technical visibility, and, where appropriate, outside counsel. For assets with potential licensing, sale, standards, or litigation relevance, additional review may be prudent. But seven layers of approval to sell or abandon an asset is nothing more than bureaucratic bloat.

The Right Pruning

There is no universal rule for when pruning should happen, but the most important window is often before the major cost escalation. By years eight to ten, companies should be aggressively reviewing whether assets remain aligned with business priorities. That timing matters because the second half of patent life can become dramatically more expensive, particularly for global patent families.

This does not mean companies should abandon patents merely because they are approaching a cost inflection point. It means the presumption should change. Early in the life of a family, uncertainty may justify continued investment. Later, uncertainty should not be enough. The asset should have a reason to remain in the portfolio as it becomes more expensive to keep.

The worst outcome is not a smaller portfolio. The worst outcome is a portfolio that consumes budget while failing to protect the business. Patent pruning forces discipline. That is why pruning should be embedded into the lifecycle of every patent portfolio, with periodic and routine reevaluation.

The companies that get this right will not merely save money. They will build portfolios with greater strategic density. They will have fewer zombie patents draining their budget. And when leadership asks why the company is spending what it is spending, the IP team will have an answer grounded in business relevance, legal quality, market evidence, and disciplined judgment.

Learn more at IPWatchdog Patent Masters 2026, where a panel titled “Patent Portfolio Triage: Killing Zombie Patents and Enforcing Discipline” will delve further into these issues. 

Image Source: Deposit Photos
Author: alexraths
Image ID: 19545769