Patents, in plain English
The clearest place on the internet to understand patents.
Plain-English summaries and claim breakdowns of landmark US patents — built in Phoenix, Arizona for inventors, founders, and engineers anywhere.
Try: "touchscreen bounce effect" · "noise-cancelling headphones" · "AI content moderation"
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Understand
what patents
actually mean.
What they really cover. What they don't. Why they matter — without the legalese. For engineers, founders, and curious humans.
Featured·US 7509588
How the iPhone's Jiggling App Icons Work
This patent describes the 'jiggle mode' on iPhones, where app icons shake to show they can be moved or deleted.
Apple Inc·2009consumer_electronicssoftware
Landmark Patents
Famous inventions, properly explained.
Start here
Patent Basics
New to patents? The guided learning path — eight short plain-English guides, in the order that makes sense.
Foundations
What Is a Patent?
The whole idea in plain English — what it gives you, what it takes, how long it lasts, what it costs.
The journey
The Patent Process
Idea to granted patent in eight stages — the deadlines that bite at each one, and a free tool for every step.
Tool · §101
Patent Eligibility Check
Walk the Alice/Mayo two-step the courts use — is your software or method even eligible? A reasoned verdict in four questions.
§101 case law
Landmark Eligibility Cases
Alice, Mayo, Diehr, Bilski, Myriad — the ten decisions that draw the patentability line, each holding in plain English.
Subject matter
What Can Be Patented?
Software, algorithms, business methods, genes, recipes, AI — the straight answer for each, with the rule and the case behind it.
§103
Non-Obviousness
The #1 reason patents are rejected — the four Graham factors, the KSR rationales, and the evidence that beats an obviousness rejection.
§102
Novelty & Prior Art
Is it new? The five §102 bars, the first-to-file rule, and how the one-year grace period really works — and where it fails you.
§112
Specification & Disclosure
Teach the invention or lose the claim — written description, enablement, definiteness, and the means-plus-function trap.
Enforcement
Patent Litigation
What really happens in a patent lawsuit — the stages, the Markman hearing, the damages and injunctions at stake, and the defenses.
Daily
Today in Patent History
Every patent filed or granted on this date, across every year in our index.
Rankings
Patent Leaderboards
Most-cited patents, most-litigated patents, top holders, and the most prolific inventors.
Tool
Patent Value Estimator
Heuristic valuation from citations, claims, expiry, litigation, and industry baseline.
Public domain
Just Expired
Patents that recently entered the public domain — newly free to use.
Power tool
Compare 4 Patents
Side-by-side matrix of up to four patents — for portfolio analysis and FTO scoping.
Interactive
Patent Quiz
10 questions on history's most influential patents. Two minutes.
Long-form
550 Years of Invention
Curated timeline from Venice 1474 to USPTO AI guidance — the moments that shaped IP.
Reference
Patent Glossary
Every term you'll encounter, in plain English. 49 individual landing pages.
Explainer
Types of Patents
Utility, design, plant — what each covers, term length, and famous examples.
Reality check
What a Patent Costs
USPTO fees, attorney fees, and maintenance — the real 2026 numbers.
Strategy
Free Patent Search
The best free databases and six tactics for finding prior art that matters.
Definition
Patent Pending Explained
What it really means, the four benefits, and the four things it does NOT do.
Decision
Attorney or DIY?
When to hire a patent attorney vs file yourself — and the dollar threshold.
Legal
Patent Infringement
The two legal tests, three damages categories, and what to do if you receive a demand letter.
Forward-looking
Expiring Soon
Patents that will enter the public domain in the next 365 days — for FTO planning.
Power tool
Claim Diff
Paste two versions of a patent claim, see a word-level redline. For prosecution amendments and IPR prep.
FTO
Claim Chart Tool
Break a claim into elements and apply the all-elements rule. Find the one element that clears your product.
The thesis
What a Patent Doesn't Cover
A patent is a fence, not a flag. The six things it never covers — and how to find the gap.
Monetization
Patent Licensing
Royalty rates by industry, license types, and seven terms that move the deal.
Ownership
Patent Assignment
How patents change hands — USPTO recording + employee invention agreements.
Why PatentBrief
Where legal language becomes clear
01
Plain‑English summary
Every patent distilled into one sentence and a full plain-English explanation — no legal training required.
02
What it covers
We map the actual claim boundaries: exactly which implementations are protected and which aren't.
03
What it doesn't cover
The part every other site skips. The edges of protection matter as much as the protection itself.
FAQ
Frequently Asked Questions
What is PatentBrief?
PatentBrief is a free tool that explains US patents in plain English — no law degree required. We break down what each patent actually covers, what it doesn't cover, and why it matters.
Is PatentBrief free?
Yes, completely free. You can search patents, read plain-English explanations, compare patents side by side, and export PDF briefs at no cost.
How current is the patent data?
Our database includes patents from the 1970s through recent grants. New patents are added regularly as they're granted by the USPTO.
Can I use PatentBrief for legal advice?
No. PatentBrief is an educational tool, not a law firm. Our explanations help you understand patents, but they don't constitute legal advice. Consult a registered patent attorney for legal guidance.
What does 'what a patent does NOT cover' mean?
Every patent has gaps — things the inventorinventorThe person who actually conceived the invention. Listed on the patent regardless of who owns it.Read more → didn't claimclaimA numbered sentence at the end of a patent that legally defines what the inventor owns. The most important section.Read more →, or claimed too narrowly. PatentBrief highlights these gaps so engineers and founders know exactly what they can and can't build without infringing.
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