What does patent mean?
Patent has several related meanings, but its best-known use is as a noun for an exclusive legal right granted by a government. A patent may protect an invention, design, process, or other qualifying subject matter for a limited period, during which its holder can exclude others from making, using, or selling it. As a verb, to patent an invention means to obtain or seek this protection. As an adjective, patent can mean protected by such a right, as in “patent technology.” In older and specialized expressions, it also means openly marketed rather than secret, especially in “patent medicine.” The meaning “plainly obvious or evident” survives particularly in formal expressions such as “a patent fact.” This range reflects the word’s history: its Latin ancestor meant “open,” while the legal sense developed from the idea of government grants issued as open letters, called letters patent. Today, patent is central to discussions of invention, intellectual property, research, and competition.
An exclusive legal right granted by a government to protect an invention, design, process, or other qualifying subject matter for a limited period.
"The company received a patent for its new battery design."
This is the dominant modern sense. The plural is patents.
To obtain or seek legal protection for an invention or design by applying for a patent; more rarely, to make something open or publicly known.
"They patented the process before publishing their results."
The legal sense is common in professional, technical, and business contexts.
Protected by a patent, openly advertised rather than secret, or plainly evident.
"The report identified a patent error in the original calculation."
The sense meaning plainly obvious now has a formal or old-fashioned tone, though it remains idiomatic in expressions such as “patent fact.”
The plural refers to individual legal rights or grants and is common in technical, legal, and business writing.
"The university holds patents for several biomedical technologies."
A patent can grant a limited monopoly, yet its Latin ancestor simply meant “open.”
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does patent come from?
English patent came through Old French patent from Latin patentem, meaning “open,” a participial form of patere, “to open.” The legal sense developed from “letters patent,” an open government document that communicated an official grant or appointment. The term later became associated with the exclusive right granted by such a document, and by extension with the act of protecting an invention as a patent.
Related word forms
How patent is actually used
In legal and technical contexts, patent is formal and specialized. As an adjective meaning plainly obvious, it has an old-fashioned, formal tone, although “patent fact” remains idiomatic. In “patent medicine,” it refers to a remedy openly advertised rather than presented with a secret formula, a usage now often historical or dismissive. British English commonly uses /ˈpeɪtənt/, while American English commonly uses /ˈpætənt/.
Easily confused with patent
A patent is a legal right or something plainly evident, whereas a patient is a person receiving medical care or someone able to wait calmly.