Patent Types · Most Common
What Is a Utility Patent?
A utility patent protects how an invention works — its function, mechanism, or process. It is the most common and most powerful US patent type, covering everything from drugs to software to manufacturing methods.
20 years
Term from filing date
§ 101
Statutory authority
3
Requirements: useful, novel, non-obvious
3
Maintenance fee deadlines (3.5 / 7.5 / 11.5 yr)
Definition
Function, not form
A utility patent is a legal right granted by the US Patent and Trademark Office (USPTO) under 35 U.S.C. § 101 that gives the patent owner the right to exclude others from making, using, selling, offering for sale, or importing the claimed invention in the United States for 20 years from the filing date.
The word “utility” does not mean “practical” in the everyday sense — it means the patent covers the invention’s utility or function, as opposed to its appearance (which is covered by a design patent) or its variety (which is covered by a plant patent).
More than 90% of all US patents issued are utility patents. When people say “a patent,” they almost always mean a utility patent.
What the patent right actually is: It is the right to exclude, not the right to use. You can hold a patent and still be unable to practice your own invention if it requires a license to an earlier patent. The patent right is purely negative — it lets you stop others.
Patentable subject matter
The four statutory categories (§ 101)
Utility patents must fall into at least one of four categories defined by 35 U.S.C. § 101. Most inventions fit more than one category — a patented drug is both a composition of matter and can be claimed as a method of treatment.
Machines
Any device with moving or interacting parts that performs a function. Classic examples: engines, turbines, printers, computer hardware, medical devices, robots.
Example
Bell's 1876 telephone (US 174,465) — a machine with a transmitter and receiver that converted sound waves to electrical signals.
Processes / Methods
A series of steps that achieve a technical result. Manufacturing processes, treatment methods, software methods implemented on hardware, data-processing algorithms when claimed as technical processes.
Example
The RSA encryption method (US 4,405,829) — a sequence of mathematical steps implemented on a computer to encode and decode data.
Compositions of Matter
Chemical compounds, pharmaceutical drugs, biological materials, alloys, polymers, and genetically modified organisms. The broadest and most valuable patent type in pharma and biotech.
Example
The CRISPR-Cas9 system — composition claims covering the guide RNA and Cas9 protein complex used for gene editing.
Articles of Manufacture
Physical items produced by a manufacturing process. Distinct from machines (which typically have moving parts) — articles are static products: a razor blade, a container, a semiconductor chip layout.
Example
Velcro (US 2,717,437) — an article comprising two fabric strips with complementary hook and loop fasteners.
What cannot be patented under § 101
×Abstract ideas — mathematical formulas, concepts, economic practices, mental processes
×Laws of nature — natural phenomena, physical or biological principles (E=mc²)
×Naturally occurring substances — a gene sequence, mineral, or organism found in nature (unmodified)
×Pure software functions — business methods implemented entirely in the mind or on paper
The boundary is not always clear — software can be patentable as a technical process implemented on hardware; a modified gene is patentable even though its natural counterpart is not. See patent eligibility and what can be patented.
Requirements
Three things every utility patent must prove
Utility
§ 101The invention must have a specific, substantial, and credible utility — a real-world practical use. This is a low bar almost every real invention clears. It rules out perpetual motion machines (physically impossible), chemical compounds with no known use, and abstract ideas with no concrete application. A prototype is not required, but you must be able to describe how the invention works and what it is useful for.
Novelty
§ 102No single prior art reference — patent, publication, product, or other public disclosure existing before your filing date — can disclose every element of your claimed invention. If every element of your broadest claim is found in one prior document, that claim is anticipated and will be rejected. This is why a prior art search before filing is critical. See the complete guide to novelty.
See the complete guide to novelty →Non-obviousness
§ 103Even if novel, the invention cannot have been obvious at the time of filing to a person having ordinary skill in the relevant field (PHOSITA). An examiner can combine multiple prior art references to argue that your invention was an obvious combination of known elements. This is the most contested hurdle — the most common rejection — and overcoming it requires arguing secondary considerations like commercial success, long-felt need, and failure of others.
Non-obviousness explained → →Beyond these three, the claims and specification must also satisfy § 112: written description, enablement (someone skilled in the art must be able to make and use the invention from the disclosure), and definiteness (claims must clearly define the scope of protection).
Patent types
Utility vs design vs plant
| Utility | Design | Plant | |
|---|---|---|---|
| Protects | How it works (function) | How it looks (ornament) | New asexually-reproduced plant variety |
| Term | 20 yrs from filing | 15 yrs from grant | 20 yrs from filing |
| Maintenance fees | Yes (3.5, 7.5, 11.5 yr) | No | No |
| Claims | Multiple (independent + dependent) | 1 claim + drawings | 1 claim |
| Cost (total est.) | $10,000–$25,000+ | $1,500–$5,000 | $5,000–$10,000 |
| Most common in | All industries | Consumer goods, UI, packaging | Agriculture, horticulture |
| Statute | 35 U.S.C. § 101 | 35 U.S.C. § 171 | 35 U.S.C. § 163 |
Cost and timeline
What to expect
Day 1
Filing
$5,000–$12,000
Attorney drafting fee + USPTO filing fee ($320 large / $200 small / $128 micro entity). A provisional application is cheaper ($2,000–$4,000) and gives 12 months before converting.
Months 18–36+
Prosecution
$2,000–$8,000
Responding to Office Actions (rejections). Most applications receive at least one OA. Each response costs $1,500–$3,000. RCEs and appeals add cost.
Month 24–48
Grant + issue fee
$1,200–$2,400
USPTO issue fee on allowance. After grant, publication in the Official Gazette. The 20-year clock started at filing — not at grant.
Years 3.5, 7.5, 11.5
Maintenance fees
$5,000–$15,000 total
Three payments to keep the patent in force. Missing a deadline by more than 6 months results in expiration. Strategic lapse is sometimes the right choice for low-value patents.
Full breakdown: What a Patent Costs →
FAQ
Common questions about utility patents
How long does a utility patent last?
A utility patent has a term of 20 years from the earliest non-provisional filing date (35 U.S.C. § 154). This is not 20 years from grant — it's 20 years from filing. An application filed in 2023 that takes 3 years to prosecute would grant in 2026 and expire in 2043. Patent Term Adjustment (PTA) can extend the term for delays caused by the USPTO; Patent Term Extension (PTE) can add up to 5 years for regulatory delays on pharmaceuticals and medical devices. To keep the patent in force, maintenance fees must be paid at 3.5, 7.5, and 11.5 years after grant.
What are the three requirements for a utility patent?
A utility patent requires three things: (1) Utility — the invention must have a specific, substantial, and credible practical use (pure scientific principles, laws of nature, and abstract ideas are excluded); (2) Novelty — no single prior art reference can disclose every element of the claimed invention (35 U.S.C. § 102); (3) Non-obviousness — the invention must not have been obvious at the time of filing to a person having ordinary skill in the relevant technical field (35 U.S.C. § 103). Separately, the claims must be enabled, written with a written description, and be definite (35 U.S.C. § 112).
What is the difference between a utility patent and a design patent?
A utility patent protects how something works — its function, structure, or method. A design patent protects how something looks — its ornamental appearance. Design patents have a 15-year term (no maintenance fees), are much cheaper to obtain ($1,500–$5,000 total vs $10,000–$25,000 for utility), and use a single claim covering the drawings. Most products need both: a utility patent for the functional innovation and a design patent for the distinctive appearance.
What can a utility patent cover?
Under 35 U.S.C. § 101, patentable subject matter for utility patents includes: machines (devices with moving or interacting parts — an engine, a robot arm, a computer), processes/methods (a series of steps that achieve a technical result — a manufacturing process, a method of treatment, an algorithm implemented in a specific technical way), compositions of matter (chemical compounds, drugs, materials, genetically modified organisms), and articles of manufacture (physical items produced from raw materials — a tool, a container). Improvements to any of these are also patentable. Not patentable: abstract ideas, laws of nature, naturally occurring phenomena, and mathematical formulas (standing alone).
How much does a utility patent cost?
The total cost of a utility patent ranges from approximately $10,000 to $25,000+ for a typical invention when using a patent attorney. This includes attorney fees for drafting ($3,000–$8,000), USPTO filing fees ($320–$800 depending on entity size), prosecution costs for responding to Office Actions ($2,000–$5,000), and the issue fee ($1,200–$2,400). Maintenance fees over the patent's life add another $5,000–$15,000. Micro-entities (qualifying small inventors) pay 80% less on USPTO fees; small entities pay 60% less.