A patent needs something new, inventive and useful — but you cannot patent a mathematical model. So how does a company protect an AI worth billions?
August 2026 · Case 2 of 6
As you read — hold this question
If the core of an AI is maths, and you cannot patent maths, what is left to protect the most valuable thing a company owns?
20
twenty years of monopoly is what a patent grants — but only if you file before you breathe a word. A trade show, a website, even a Facebook post can sink it. Australia gives a year’s grace; Europe and the UK give none.
Patents protect a genuine invention — new, inventive and useful, like Wi-Fi or the cochlear implant. But the examiners are blunt about one thing: you cannot patent a mathematical model, an algorithm, or a pure idea. Which means the very thing an AI is, at its core, cannot be patented at all.
The examinable core
The textbook version
What a patent can and cannot hold
A patent protects an invention that is new, inventive and useful, for up to 20 years. There is a catch the examiners stress: don’t disclose before you file. A trade show, a website, even a Facebook post can destroy novelty. Australia grants a one-year grace period; Europe and the UK do not.
But there is a hard limit: you cannot patent a mathematical model, an algorithm, or a pure idea. The core of an AI is maths. So the thing itself is unpatentable.
Carry this
You can patent an application of AI, but not the model’s maths. Disclosure rules make patents fragile; the maths exclusion makes the core unprotectable by patent at all.
So what protects the model?
The other side
Straight back to the vault
If you can’t patent a model worth billions, you go straight back to the quiet layer. You don’t patent it — you hide it as a trade secret. That is the opposite of the patent bargain: no disclosure, no fixed term, protection only for as long as you keep it secret.
The practitioner consequence
For anyone building with AI, this reframes protection. Your edge is rarely a patent on the model. It is the trade secret, the proprietary data, the know-how — and the contracts and NDAs that keep them in the vault.
Quick recall — without looking back
Test yourself on this case
Question 1 of 3
Why can’t the core of an AI be patented?
Because you cannot patent a mathematical model, an algorithm, or a pure idea, and an AI model is, at its core, maths. Patents cover new/inventive/useful inventions — not the underlying maths.
Question 2 of 3
What is the patent disclosure trap, and how does Australia differ from Europe?
If you disclose before you file — a demo, a website, even a Facebook post — you can destroy novelty. Australia gives a one-year grace period; Europe and the UK give none.
Question 3 of 3
If you can’t patent the model, how do companies protect it?
As a trade secret — the quiet, unregistered layer. No disclosure, no fixed term; it lasts only as long as it stays secret.