What is the difference between a patent and a trademark?
A patent and a trademark are distinct forms of intellectual property that protect different things, operate under different statutes, and last for very different lengths of time. The distinction matters every time you counsel an inventor or brand owner on IP strategy.
What a patent protects
A U.S. patent gives the owner the right to exclude others from making, using, offering for sale, selling, or importing the covered invention in the United States for a limited time. That exclusion can cover processes, machines, articles of manufacture, compositions of matter, and improvements thereto, as well as original ornamental designs and new, asexually reproduced plant varieties. Patent law is grounded in Article I, Section 8, Clause 8 of the U.S. Constitution and codified at 35 U.S.C. §§ 1 et seq.
The quid pro quo of the patent bargain is public disclosure: to receive a patent, the inventor must describe the invention in sufficient detail to enable others skilled in the field to make and use it. When the patent expires, that disclosure enters the public domain and anyone may freely practice the invention.
What a trademark protects
A trademark is any word, phrase, symbol, design, or combination that identifies goods or services and distinguishes them from those of competitors in commerce. The governing federal statute is the Lanham Act, codified at 15 U.S.C. §§ 1051 et seq.
Trademark rights are narrower than they might appear: they apply only to how the mark is used in connection with specific goods or services, not to the word or symbol in all contexts. The law's core prohibition is against using marks that would confuse consumers about the source of goods or services. Unlike patents, federal registration is not required for protection; common-law trademark rights arise from use in commerce.
Key differences at a glance
| Dimension | Patent | Trademark |
|---|---|---|
| What it protects | An invention (process, machine, composition, design, plant) | A source identifier (name, logo, slogan) |
| Governing statute | 35 U.S.C. §§ 1 et seq. | 15 U.S.C. §§ 1051 et seq. (Lanham Act) |
| Registration | USPTO grant required | Optional; common-law rights arise from use |
| Disclosure | Yes; enablement is a condition of the grant | No |
| Term | Utility/plant: 20 yrs from U.S. filing date; Design: 15 yrs from grant | 10-yr term, renewable indefinitely on continued use |
Duration: limited vs. potentially unlimited
A utility patent's term ends 20 years from the U.S. filing date of the application. A design patent lasts 15 years from the date of grant. Once expired, the invention enters the public domain and the protection cannot be revived by re-filing.
A federal trademark registration starts with a 10-year term and is renewable indefinitely for successive 10-year periods, as long as the owner files evidence that the mark remains in use in commerce. A well-maintained trademark can theoretically last forever.
When you need both
A single product can be protected by a patent and a trademark at the same time. Consider a novel device: the utility patent covers the functional mechanism, and the trademark covers the brand name or logo. When the patent expires and competitors are legally free to manufacture the same mechanism, the trademark continues to protect the brand identity.
This is the practical point practitioners often need to explain to clients: a patent does not protect a brand name or logo, and a trademark does not protect a functional invention. The two rights protect different layers of the same commercial asset and are obtained, maintained, and enforced through separate legal tracks.