Asking what are patent laws covers three separate things: the statute, the offices that apply it, and the courts that interpret it.
The statute changes rarely. The case law changes continually. Administrative practice changes fastest of all.
Which means a position learned three years ago can be wrong today without anything in the statute having moved.
And none of it is international. Patents are national, and every country runs its own version.
The sources
| Source | Contains |
|---|---|
| Title 35, US Code | The statute |
| Title 37, CFR | USPTO regulations |
| MPEP | Examination practice manual |
| Federal Circuit opinions | Binding case law |
| Supreme Court decisions | Infrequent, high impact |
| PTAB precedential decisions | Bind the Board only |
| Trial Practice Guide | Guidance, not binding |
Federal Circuit decisions bind everyone below, including district courts and the PTAB. It hears all patent appeals, which is why its rulings apply uniformly.
PTAB designations bind only the Board. Courts are free to disagree. See PTAB precedential decisions.
The four statutory requirements
| Section | Requirement | Fails when |
|---|---|---|
| §101 | Eligible subject matter | Abstract idea, natural law, natural phenomenon |
| §102 | Novelty | A single reference discloses everything claimed |
| §103 | Non-obviousness | A skilled person would find it predictable |
| §112 | Description, enablement, definiteness | Support or clarity is inadequate |
§103 rejects more applications than §102. Combining known elements predictably is obvious even where nobody has done it.
§101 is the field-specific one. Software and business methods face it hardest, and it can be dispositive regardless of how novel the invention is. See what can be patented.
Who issues patents
| Office | Grants | Covering |
|---|---|---|
| USPTO | US patents | The United States |
| EPO | European patents | Then validated per state |
| CNIPA | Chinese patents | China |
| JPO | Japanese patents | Japan |
| KIPO, IPO, INPI, others | National patents | Their territory |
| WIPO | Administers treaties | Grants nothing |
No office grants a world patent because no such thing exists.
WIPO administers the PCT and other treaties and does not grant rights. The PCT is a filing route.
European patents fragment at grant. Validation in each designated state creates a separate national right with its own annuity and its own consequences for lapse.
The institutions that decide disputes
| Forum | Handles | Appeals to |
|---|---|---|
| District courts | Infringement, validity, damages | Federal Circuit |
| ITC | Importation, §337 investigations | Federal Circuit |
| PTAB | IPR, PGR, ex parte appeals | Federal Circuit |
| Federal Circuit | All patent appeals | Supreme Court |
| Supreme Court | Selected cases | — |
The Federal Circuit was created to unify patent law. Before it, different circuits reached different conclusions on the same questions.
The PTAB is inside the USPTO, not a court. Its proceedings are administrative, run on a statutory timeline, and are limited in the grounds they can consider — IPR covers only §102 and §103 on patents and printed publications. See PTAB.
The America Invents Act
| Change | Effect |
|---|---|
| First to file | Earlier effective filing date prevails |
| Created IPR and PGR | Administrative validity challenges |
| Post-grant review window | 9 months from grant |
| Third-party submissions | Prior art during examination |
| Micro entity status | 80% fee reduction |
| Prior commercial use defence | Expanded |
First to file aligned the US with most of the world. Who invented first no longer decides between competing applicants.
IPR changed enforcement economics substantially, giving accused infringers a faster and cheaper route to challenge validity than district court litigation.
International treaties coordinate, they do not grant
| Treaty | Provides |
|---|---|
| Paris Convention | 12-month priority period for foreign filing |
| PCT | One international application, national decisions deferred to ~30 months |
| TRIPS | Minimum standards for member states |
| Hague | Registered design filing across members |
| None of them | A world patent |
The Paris Convention priority period is twelve months for utility inventions and six months for designs.
The PCT buys time, not rights. It defers the expensive national filing decisions while preserving the priority date. See patent priority date.
Where the law is currently contested
| Area | The question |
|---|---|
| §101 eligibility | What survives Alice and Mayo, especially software and diagnostics |
| PTAB discretionary denial | Whether petitions are heard at all |
| Damages apportionment | The royalty base, and the entire market value rule |
| Standard essential patents | FRAND obligations, injunctive relief |
| Willfulness and enhancement | The Halo discretionary standard |
| Venue | Where cases may be brought |
Discretionary denial has moved most. Institution rates were approximately 65% in October 2024 and approximately 37% in February 2026, so any figure quoted without a date is close to meaningless.
Eligibility is the longest-running dispute. It affects whether whole categories of invention are patentable at all, and legislative proposals to address it have been recurring for years.
National differences that matter
| Issue | United States | Elsewhere |
|---|---|---|
| Grace period | 1 year for your own disclosure | Usually none |
| Business method eligibility | Alice two-step | EPO: technical character |
| Opposition after grant | PGR, 9 months | EPO: 9-month opposition |
| Renewal | 3 maintenance fees | Annual annuities |
| Utility models | None | Available in several countries |
| Design term | 15 yrs from grant, no fees | Often 25 yrs with renewals |
The grace period difference is the one that costs inventors rights. A US-only mindset leads to disclosure before filing, which forfeits protection almost everywhere else.
The economic reality the law creates
| Fee | Due after grant | Large | Small | Micro |
|---|---|---|---|---|
| First | 3.5 years | $2,150 | $860 | $430 |
| Second | 7.5 years | $4,040 | $1,616 | $808 |
| Third | 11.5 years | $8,280 | $3,312 | $1,656 |
| Total | $14,470 | $5,788 | $2,894 |
| Ipiry Patent Survival Curve v1.0 | Rate |
|---|---|
| Survive the 3.5-year fee (2022 cohort) | 85.8% |
| Survive the 7.5-year fee (2018 cohort) | 64.6% |
| Reach full term (2014 cohort) | 41.4% |
| Abandoned before full term | 58.6% |
Computed from 27,273,654 USPTO maintenance fee records covering 8,262,336 US utility patents — see the patent survival curve.
The escalating fee schedule is deliberate policy. It pushes patents nobody values back into the public domain rather than letting them sit for twenty years, and nearly three in five take that route.
What the law does not do
| Not protected | Why |
|---|---|
| Ideas without a claimed implementation | Enablement is required |
| Discoveries of natural phenomena | §101 exception |
| Abstract ideas | §101 exception |
| Your right to practise your own invention | Patents exclude; they do not permit |
| Activity abroad | Rights are national |
| Independent invention as a defence | No such defence in patent law |
Independent creation is a defence to copyright and trade secret claims and not to patent claims. That is what makes patents unusually strong and freedom-to-operate work necessary. See patent rights.
Keeping current
| Layer | Speed | Where |
|---|---|---|
| Statute | Slow | Title 35 |
| Federal Circuit | Continual | Published opinions, free |
| Supreme Court | Infrequent | — |
| PTAB practice | Fast | USPTO precedential list |
| Examination guidance | Periodic | MPEP, USPTO notices |
Primary sources are free. Secondary summaries are useful for triage and always describe the position at the time of writing.
Date every practice statistic. See patent litigation updates.
What are patent laws: the checklist
- Title 35 is the statute; 37 CFR the rules; the MPEP is examination practice.
- Federal Circuit decisions bind everyone below. PTAB designations bind only the Board.
- Four requirements — §101, §102, §103, §112 — all must be met.
- §103 rejects more applications than §102.
- National offices grant patents. No world patent exists.
- Treaties coordinate filing, they do not grant rights.
- The Paris priority period is twelve months, six for designs.
- Grace periods are a US feature. Most countries have none.
- Date any PTAB statistic. Institution practice has moved substantially.
- Use primary sources. The case law moves faster than summaries of it.