Patents Entering the Public Domain in 2026: What's Expiring and Why It Matters

Every year, hundreds of thousands of US patents expire and enter the public domain. In 2026, we're looking at roughly 180,000 utility patents reaching the end of their term — mostly patents filed between 2004 and 2008 that were granted and maintained through their full 20-year life.

When a patent expires, anyone can use the invention without permission or royalties. That's the deal: the government gives you a monopoly for a limited time, and in exchange, you disclose how your invention works so the public eventually benefits. 2026 has some interesting ones.

How Patent Expiry Works (It's Not Always 20 Years)

The standard rule: US utility patents filed after June 8, 1995 expire 20 years from the earliest effective filing date. Simple enough.

Except it's not that simple.

Patent Term Adjustment (PTA) adds time when the USPTO takes too long to examine your application. If examination drags past certain statutory deadlines, you get extra days tacked onto your patent term. Some patents have 500+ days of PTA. This is calculated automatically and printed on the patent's face, but it means a patent "filed in 2006" might not actually expire until mid-2027.

Patent Term Extension (PTE) applies to certain regulated products — drugs, medical devices, food additives — where FDA approval delays eat into your patent term. A drug patent could get up to 5 years of extension. This is why some pharmaceutical patents seem to last forever.

Maintenance fees are the other catch. US utility patents require maintenance fee payments at 3.5, 7.5, and 11.5 years after grant. Miss a payment and your patent expires early. About 50% of all patents lapse before reaching their full 20-year term because the owner decided the patent wasn't worth maintaining. So that 180,000 number? It's the ones that someone actually paid to keep alive the whole time.

Drug Patents Expiring in 2026

This is where expiry gets expensive — for the patent holders, anyway. When key pharmaceutical patents expire, generic manufacturers can enter the market, and drug prices typically drop 80-90%.

Some notable pharma patents expiring or losing exclusivity in 2026:

Eliquis (apixaban) — Bristol-Myers Squibb and Pfizer's blood thinner. One of the best-selling drugs in the world, with over $12 billion in annual US sales. Key patents expire in 2026, and generic companies are already lined up. This one alone will reshape the anticoagulant market.

Entresto (sacubitril/valsartan) — Novartis's heart failure drug. Annual sales around $6 billion. The composition of matter patents are expiring, though some formulation patents may linger a bit longer.

Jardiance (empagliflozin) — Eli Lilly and Boehringer Ingelheim's diabetes drug. Market exclusivity ending in 2025-2026. SGLT2 inhibitors as a class are becoming increasingly genericized.

The FDA's Orange Book lists the specific patents covering each drug. If you want to check whether a particular pharmaceutical patent is actually expiring (and not extended), look up the patent number on Patent Bear and check the estimated expiry date, which factors in PTA.

Tech Patents Hitting the Public Domain

The patents expiring in 2026 were mostly filed in the 2004-2008 era. That means we're seeing the expiry of foundational patents covering:

Smartphone technology from the pre-iPhone era. A lot of early mobile computing, touchscreen interaction, and wireless communication patents filed in 2005-2006 are expiring. These were aggressively litigated during the "smartphone wars" of 2010-2015 — Apple v. Samsung alone involved dozens of patents that are now or soon will be public domain.

Early cloud computing architectures. Amazon Web Services launched in 2006. Patents covering early cloud infrastructure concepts — distributed storage, virtualization, elastic computing — are starting to expire. Not that this changes much practically, since the technology has evolved so far beyond what those patents covered.

Social media mechanics. Some of Facebook's earliest patents (filed 2005-2007) covering news feed algorithms, social graph features, and content sharing are expiring. Again, the actual implementations have moved way past what those claims describe.

Early smartphone cameras and image processing. Patents on camera phone technology, image stabilization methods, and mobile photo processing from the 2005-2006 era are opening up.

Who Cares About Patent Expiry?

Generic Drug Manufacturers

They care a lot. A single blockbuster drug patent expiry can be worth billions in generic market opportunity. Companies like Teva, Mylan (now Viatris), and Sandoz build their entire business strategies around patent expiry timelines.

Electronics Manufacturers

Particularly smaller ones. When foundational technology patents expire, the barrier to entry drops. You don't need a license from Qualcomm to use a wireless communication method that's now in the public domain.

Patent Portfolio Managers

If you're managing a corporate patent portfolio, you need to know what's expiring — both your own patents (should you file continuations covering improvements?) and your competitors' patents (new market opportunities).

Researchers and Inventors

Expired patents are free prior art. You can build on them, improve them, and file new patents on your improvements without worrying about the original patent.

How to Check If a Specific Patent Has Expired

The expiry calculation isn't always obvious. Here's what you need to check:

1. Filing date — 20 years from the earliest effective US filing date (not the priority date from a foreign application)
2. Patent Term Adjustment — printed on the face of the patent, adds days to the term
3. Patent Term Extension — check the USPTO's PTE records for pharmaceutical patents
4. Maintenance fee status — check PAIR (or Patent Bear, which links to PAIR) to see if fees were paid
5. Terminal disclaimers — if the patent has a terminal disclaimer, its term might be tied to an earlier-expiring related patent

On Patent Bear, every patent page shows the estimated expiry date, factoring in PTA. We also show continuity data so you can see if the patent's effective filing date is earlier than the actual filing date (which shortens the term).

The Bigger Picture

The US patent system was designed so that patents eventually expire. That's a feature, not a bug. The 20-year term is a compromise: long enough to incentivize investment in R&D, short enough that technology eventually becomes freely available.

In 2026, the public is getting access to about 180,000 inventions that were filed during a period of intense innovation in mobile, cloud, pharma, and clean energy. Most of these patents have been superseded by newer technology, but some — particularly in pharmaceuticals — will have immediate, tangible effects on prices and availability.

If you're interested in what specific patents are expiring in your technology area, search by CPC class and filing year on Patent Bear, then check the expiry dates. The public domain is growing by about 500 patents every day.