Everything we know about patents, in plain English.

What a patent actually is

A patent is a bargain with the public. In exchange for fully disclosing how your invention works, the government gives you the right to stop others from making, using, selling, or importing it for a limited time. A US utility patent lasts 20 years from its filing date, after which the invention enters the public domain and anyone can use it freely.

Crucially, a patent is a right to exclude — not a right to practice. It lets you stop competitors, but it does not guarantee you can sell your own product, because someone else's earlier patent might still cover part of what you built. That distinction shapes almost every strategic decision that follows.

The four things every invention needs

To be patentable, an invention has to clear four bars. It must be eligible subject matter under Section 101 — a process, machine, manufacture, or composition of matter, not an abstract idea or law of nature on its own. It must be novel under Section 102, meaning nobody publicly disclosed it before your filing date. It must be non-obvious under Section 103 — a meaningful step beyond what a skilled person would have combined from existing knowledge. And the application must satisfy Section 112: it has to describe the invention fully enough that someone in the field could build it, and claim it in language precise enough to mark its boundaries.

Most rejected applications fail on novelty or obviousness — there was prior art the inventor didn't know about. That is why a real prior-art search before you spend money is the single highest-leverage thing you can do.

Filing: provisional, then non-provisional

Most inventors start with a provisional application. It is a low-cost placeholder that locks in your filing date for 12 months and lets you say “patent pending,” but it is never examined and never becomes a patent on its own. It only protects what it actually describes, so a thin provisional protects almost nothing.

Within 12 months you must file a non-provisional application — the real thing the USPTO examines. It requires formal claims, drawings, and a complete specification. That 12-month deadline is statutory and cannot be extended, so the year between the two filings is for refining the invention, testing the market, and deciding whether the bigger commitment is worth it.

Prosecution: the back-and-forth with the examiner

After filing, an examiner reviews the application and almost always pushes back with an “office action” — a written rejection citing prior art or clarity problems. This is normal, not failure. You respond by arguing, narrowing the claims, or both, and the exchange repeats until the examiner allows the claims or you give up. From filing to a final decision typically takes a couple of years.

The scope you end up with is decided here. Broad claims are more valuable but easier to reject or invalidate; narrow claims grant more easily but are easier to design around. Good prosecution is the art of keeping claims as broad as the prior art allows.

After the grant: keeping it alive, and using it

A granted utility patent is not “set and forget.” You owe maintenance fees at 3.5, 7.5, and 11.5 years after grant; miss one and the patent lapses early into the public domain. Marking your products with the patent number preserves your ability to collect damages.

A patent is only worth what you can enforce. If a competitor infringes, your options range from a licensing letter to a federal lawsuit — and the accused party can fight back by challenging your patent's validity at the Patent Trial and Appeal Board through inter partes review. Litigation is among the most expensive disputes in US law, so most disputes settle.

Is a patent even the right tool?

Patents are not always the answer. A patent requires you to publish exactly how your invention works, so for something that can be kept secret and is hard to reverse-engineer — a manufacturing process, a recipe, an algorithm you never ship — a trade secret can protect it indefinitely without disclosure. Copyright covers creative expression and code; trademarks cover brand names and logos. The strongest IP strategies usually combine several of these, matched to what each one actually protects.

The guides below walk through every one of these decisions in plain English — start at the top if you're new, or jump to the stage you're stuck on.

Start here

New to patents? Begin with these.

Understand the language

Patents are written in a precise dialect. These decode it.

The four requirements

What it takes for an invention to be patentable.

Filing & prosecution

From provisional to grant.

After the grant

Keeping a patent alive — and what happens when it ends.

Strategy & analysis

Reading, valuing, and navigating patents.

Enforcement & disputes

What happens when patents collide.

History & invention

The stories behind the patents.

Avoid the pitfalls

The mistakes and misconceptions that cost inventors.

Tools & play

Put it into practice.