United States PTO Memo on Software Patent Eligibility

If software patent eligibility feels like a maze built by lawyers, judges, and one very grumpy robot, you are not imagining things. For years, applicants have had to navigate Alice, Section 101 rejections, and a parade of examiner questions that can turn a perfectly good software invention into a philosophical debate about whether math is secretly running the world. The good news is that recent United States Patent and Trademark Office guidance has made the picture clearer. Not magically easy. Not rainbow-and-unicorns easy. But clearer.

The current PTO approach matters because it explains how examiners should evaluate software, artificial intelligence, and machine-learning inventions under patent eligibility law. And the biggest takeaway is this: software patents are not dead. What is dead, or at least badly bruised, is the old habit of drafting broad claims that sound like “do a business idea on a computer and call it innovation.” The modern PTO wants to see a real technical solution, a real technical improvement, and claims that actually match the improvement described in the specification.

Why the PTO Memo Matters So Much

The recent PTO materials on software patent eligibility did not rewrite Section 101. Only Congress or the courts could pull off that kind of dramatic makeover. What the PTO did do, however, is give examiners and applicants a more practical framework for applying the existing law. That is huge, because Section 101 has often been less like a clear rulebook and more like a weather report: cloudy, shifting, and somehow still able to ruin your day.

In practical terms, the PTO’s recent guidance tells examiners to slow down before tossing software claims into the “abstract idea” bin. It emphasizes a few points that matter a lot for software inventions: examiners must distinguish between claims that recite a judicial exception and claims that merely involve one, they must analyze the claim as a whole, and they must seriously consider whether the invention improves computer functionality or another technical field.

That sounds subtle, but it changes real outcomes. A claim that merely uses algorithms inside a larger technical system is not the same thing as a claim directed only to an abstract mathematical concept. That distinction can be the difference between allowance and a Section 101 rejection that makes the applicant want to take up pottery instead.

The Backstory: Why Alice Still Haunts Software Patents

Any article about software patent eligibility has to start with Alice Corp. v. CLS Bank, the Supreme Court case that became the monster under every patent prosecutor’s bed. In Alice, the Court held that implementing an abstract idea on a generic computer is not enough for patent eligibility. That principle still drives the two-step framework used in Section 101 analysis today.

What Alice Actually Knocked Out

Alice targeted claims that were essentially business logic dressed up in computer clothing. The Court was not impressed by claims that said, in effect, “take a longstanding commercial practice, add a computer, and voilà, innovation.” The message was clear: generic computer implementation cannot rescue an otherwise abstract idea.

That result made sense for weak claims, but the problem came later. For a while, many software inventions got painted with the same brush. Some examiners and courts treated software as suspicious by default, as though code were guilty until proven technical.

What Alice Did Not Say

This is the part people often miss. Alice did not say software is unpatentable. It did not say machine learning is doomed. It did not say every claim involving calculations, logic, or data processing is automatically abstract. That is where later Federal Circuit decisions became important.

Cases like Enfish and McRO helped restore some sanity. In Enfish, the Federal Circuit explained that claims directed to a specific improvement in computer functionality can be eligible at step one of the analysis. In McRO, the court found eligibility where the invention focused on a specific improvement in computer animation rather than merely automating a human task. Translation: software that improves how technology works can still qualify for patent protection.

What the PTO Has Been Telling Examiners

The modern PTO approach is not built on one lonely memo floating through cyberspace. It is better understood as a layered body of guidance, with the 2024 subject matter eligibility update, the 2025 reminder memo, and the later Desjardins-related MPEP notice all reinforcing the same theme: focus on the technical substance of the claim.

The 2024 Update: A More Detailed Step 2A Analysis

The 2024 eligibility update gave examiners more instruction on Step 2A, which asks first whether a claim recites a judicial exception and then whether any such exception is integrated into a practical application. This matters because many software claims do not live or die on Step 2B “inventive concept” arguments. They live or die earlier, at the stage where the PTO asks whether the claim is really “directed to” an abstract idea in the first place.

The update also included AI-focused examples. That was not just window dressing. It signaled that the PTO understands modern inventions are often built with neural networks, model training, signal processing, anomaly detection, and other computation-heavy tools. The key question is not whether the claim contains math or machine learning. The key question is whether the claim is drafted around a technical implementation and a technical result.

The 2025 Memo: Less Shortcutting, More Careful Analysis

The August 2025 PTO memo is especially important for software practitioners. It warns examiners not to overuse the “mental process” category and reminds them to distinguish claims that recite an exception from claims that merely involve one. That is a deceptively powerful clarification.

Consider a software claim that trains a neural network as part of a larger security system. If the claim recites specific mathematical relationships by name and stops there, it may look abstract. But if the claim instead frames the invention as a technical architecture that detects malicious packets, blocks suspicious traffic in real time, and improves network security, the eligibility analysis changes. Suddenly the claim is not “math in a hoodie.” It is a technical system solving a technical problem.

The memo also reminds examiners to evaluate the claim as a whole. That should sound obvious, but in practice it is easy for patent eligibility analysis to become a scavenger hunt for abstract snippets. If you dissect any modern software claim aggressively enough, you can always find data, logic, or calculations. The PTO’s point is that you cannot stop there.

The Desjardins Notice: Specification Quality Now Matters Even More

The later PTO notice tied to Ex parte Desjardins pushed another practical lesson to the front of the line: if you want to argue technical improvement, your specification had better show one. The PTO emphasized that the disclosure should contain enough detail so that a person of ordinary skill would recognize an improvement in computer functionality or another technical field. Then the claims must actually reflect that improvement.

That is not a small drafting tweak. It is a strategy shift. The best software patents now tend to read less like broad mission statements and more like engineering documents with legal muscle. They identify a system bottleneck, latency issue, resource constraint, accuracy problem, security weakness, or architecture limitation. Then they explain how the invention fixes it.

How Software Claims Survive Section 101

If there is one lesson from the PTO guidance and the case law, it is this: software patent eligibility usually rises or falls on how specifically the invention is tied to technology.

1. Lead With the Technical Problem

Strong applications explain the technical pain point early. Maybe the invention reduces memory overhead, improves packet inspection in real time, separates speech signals more accurately in noisy environments, or increases model efficiency on specialized hardware. The point is to make the technical problem unmistakable.

2. Describe a Technical Solution, Not a Business Goal

“Improves customer engagement” is not a technical solution. “Reduces false positives in network intrusion detection through a particular trained-model architecture deployed on a defined system” is getting warmer. Eligibility gets stronger when the invention sounds like engineering rather than boardroom wallpaper.

3. Claim the Improvement, Not Just the Result

One of the biggest mistakes in software patent drafting is claiming the desired outcome while leaving out the mechanism that produces it. Courts and examiners are skeptical of results-only claims. If the specification says the invention improves computer performance, the claims should include the features, steps, or components that create that performance improvement.

4. Show Integration Into a Practical Application

The PTO examples are especially useful here. Claims become stronger when they are tied to real system behavior: filtering traffic, modifying signal processing, controlling device operation, improving database structure, or enhancing another technical field. A software claim that stays in the clouds is vulnerable. A software claim that does something concrete in a technical environment has a fighting chance.

Specific Examples of Where the Line Is Drawn

Imagine two inventions.

The first is a generic SaaS platform that uses rules to match users with service providers based on preferences, schedules, and pricing. That may be commercially valuable, but unless the claim is tied to a specific technical improvement in computing, it risks looking like a business method in software drag.

The second invention uses a trained model on a defined system architecture to identify malicious network packets and automatically block suspicious traffic in real time, reducing delay and improving security operations. That begins to look like the kind of technical improvement the PTO and Federal Circuit treat more favorably.

Here is another contrast. A claim that merely says “process audio using a neural network” is vulnerable. A claim that recites a specific speech-separation implementation that improves signal handling in a practical system has a better eligibility story. Likewise, a claim for a new database structure, network monitoring mechanism, or computer animation rule set is stronger when it is framed as improving the operation of the computer system itself, not simply using the computer as a fancy calculator.

What Still Gets Software Applicants in Trouble

Despite the PTO’s clearer guidance, there are still plenty of traps.

Overclaiming

Broad claims that try to monopolize a concept at a high level of abstraction remain dangerous. The wider the claim, the easier it is for an examiner to characterize it as an abstract idea.

Thin Specifications

If the specification does not explain why the invention improves technology, later arguments about technical improvement can feel like last-minute improv comedy. And patent examiners are not known for rewarding improv comedy.

Business Language Everywhere

Words like “optimize,” “facilitate,” “manage,” and “match” are not fatal, but they are weak when standing alone. Technical language tied to architecture, operations, data structures, model behavior, or system constraints is far more persuasive.

Claims That Only Name Generic Hardware

Adding “processor,” “memory,” or “server” to an abstract workflow does not do much. The claim needs more than generic hardware labels stapled onto a vague idea.

What Startups, Inventors, and Patent Teams Should Do Now

For applicants, the PTO’s current posture creates a better opening for well-drafted software applications than many people assume. The path forward is not to pretend Section 101 disappeared. It is to work with it intelligently.

Write specifications that explain the technical problem in plain but precise terms. Include implementation details. Explain how the claimed features improve the functioning of a computer, network, model-training process, signal-processing pipeline, database, or other technical system. Draft claim sets with layers: broader claims for business value, narrower claims for technical survivability, and dependent claims that capture specific system features.

In prosecution, align arguments with PTO language. Show whether the claim merely involves a mathematical concept or actually recites one. Point to the technical improvement in the specification. Explain how the claim integrates any abstract concept into a practical application. And when the facts support it, use the logic of Enfish, McRO, and related decisions to frame the invention as a genuine technological advance.

The larger lesson is reassuring. The modern PTO is not asking software inventors to apologize for being software inventors. It is asking them to prove that their inventions improve technology in a concrete way. That is a higher bar than “we automated a thing,” but it is also a more sensible one.

Practical Experiences With the United States PTO Memo on Software Patent Eligibility

In practice, the biggest change many applicants experience after the PTO’s recent guidance is that examiner conversations have become more focused on technical framing instead of reflexive abstraction. Patent teams that used to hear “this sounds like math” now have a better opening to respond with, “No, this is a specific system architecture that improves network security, processing efficiency, or computer operation.” That does not guarantee success, but it changes the tone of prosecution in a meaningful way.

One common experience involves AI startups that originally filed applications with language centered on training, scoring, classifying, or predicting. Those verbs may be accurate, but alone they can make the invention look like a naked algorithm. After revising the narrative to emphasize hardware configuration, data flow, real-time action, reduced latency, improved detection, or other concrete technical effects, the same core invention often reads much stronger. The technical story was there all along; it just needed to be surfaced instead of buried under buzzwords.

Another recurring experience is learning that the specification does most of the heavy lifting. Applicants sometimes assume eligibility arguments can be bolted on later during prosecution. The PTO’s recent position makes that much harder. If the original application does not clearly explain the system bottleneck, the engineering tradeoff, or the specific improvement over prior approaches, later attorney argument can sound like decorative frosting on an empty cake. By contrast, applications that explain the technical problem from day one tend to give prosecutors far more room to argue practical application and computer improvement.

Patent teams also report a noticeable difference between inventions that automate office workflows and inventions that improve computing itself. A software tool that routes invoices, ranks leads, or matches users may be commercially useful and still face hard Section 101 questions. Meanwhile, inventions aimed at database performance, packet inspection, model deployment efficiency, speech processing, computer vision pipelines, or secure device operation often have a more natural path to eligibility because the technical improvement is easier to articulate. The PTO memo does not bless all software equally; it rewards software that behaves like technology rather than business administration with a keyboard.

There is also a practical interviewing lesson here. Examiners often respond better when applicants stop arguing at the level of slogans and start pointing to concrete claim language. Instead of saying, “Our claim is not abstract,” effective applicants explain how a particular limitation changes device behavior, improves accuracy in a defined environment, reduces processing cost, or achieves a system-level benefit. That style of argument tracks the PTO’s current guidance and tends to be more persuasive than broad declarations that the invention is “innovative.” Everyone says that. The memo rewards applicants who can prove it with engineering detail.

Finally, the real-world experience for many software companies is oddly encouraging: Section 101 is still difficult, but it is less random when the application is drafted well. Applicants who pair a strong specification with claims grounded in a technical solution are in a better position than the market’s old cynicism would suggest. Software patent eligibility in the United States is no longer a free pass, but it is not a funeral either. It is a drafting discipline. And once applicants understand that, the PTO memo starts to look less like a warning label and more like a survival manual.

Conclusion

The United States PTO memo on software patent eligibility is best understood as a practical guide for navigating a legal area that has often felt frustratingly unpredictable. The message from the PTO and the key Federal Circuit cases is consistent: software inventions can be patent-eligible when they are directed to specific technical improvements and claimed as real technological solutions rather than abstract goals. For startups, enterprise innovators, and patent counsel, that means the winning playbook is now clearer. Build the record in the specification. Draft claims that reflect the improvement. Tie the invention to a practical technical application. And never assume that adding the word “computer” turns a vague idea into patentable subject matter. Section 101 still has teeth, but the rules are no longer a total mystery.