Definition
A patent is a federal grant of exclusive rights to an inventor for a limited period, given in exchange for publicly disclosing how the invention works. It allows the patent holder to exclude others from making, using, selling, offering to sell, or importing the patented invention without permission. Patents are governed entirely by federal law and are issued by the U.S. Patent and Trademark Office (USPTO).
Legal Meaning
A patent represents a bargain between an inventor and the public, rooted in the same constitutional clause that supports copyright. The inventor agrees to publicly disclose the details of an invention, teaching the world how it works; in return, the government grants a time-limited right to exclude others from exploiting that invention. Because patents are governed by federal law and administered by the USPTO, the rules are uniform across the country, and there is no such thing as a state patent.
It is important to understand that a patent is a right to exclude, not an affirmative right to practice the invention. Holding a patent lets the owner stop others from making or selling the invention, but it does not guarantee the owner can legally make the product if doing so would infringe someone else's patent or violate other laws. Patent rights are enforced through infringement lawsuits in federal court, where remedies can include injunctions and monetary damages.
To obtain a patent, an inventor files an application with the USPTO that includes a detailed specification describing the invention and one or more claims that define the precise scope of the legal rights sought. A patent examiner reviews the application against the legal requirements and prior art. The United States operates on a "first-inventor-to-file" system, meaning that, generally, the first inventor to file an application has priority. Because of strict disclosure and timing rules, inventors should be cautious about publicly disclosing or selling an invention before filing.
Key Points
- Patents are governed by federal law and issued by the U.S. Patent and Trademark Office
- A patent is a right to exclude others, not a guaranteed right to practice the invention
- The three main types are utility, design, and plant patents
- An invention must be useful, novel, and non-obvious to be patentable
- The inventor must fully disclose the invention so others could make and use it
- The U.S. uses a first-inventor-to-file priority system
- Utility patents generally last 20 years from filing; design patents 15 years from grant
- Public disclosure or sale before filing can jeopardize patent rights
Real-World Example
An engineer invents a novel battery design that charges far faster than existing ones. Before telling anyone, she files a utility patent application with the USPTO, including a detailed specification and claims defining the new design. After examination, the patent issues, giving her the right to exclude others from making, using, or selling that battery design for the patent's term.
A competitor later begins selling a battery that falls within her patent claims. She can sue for patent infringement in federal court and seek an injunction and damages. Had she instead publicly demonstrated and sold the battery for a year before filing, she might have lost the ability to patent it, illustrating why early, confidential filing matters.
Types of U.S. Patents
| Type | What It Protects | Examples |
|---|---|---|
| Utility Patent | How an invention works or is used — a new process, machine, manufacture, or composition of matter | A new engine, drug formula, or software-driven process |
| Design Patent | The ornamental, non-functional appearance of an article | The distinctive shape of a bottle or device |
| Plant Patent | A new and distinct variety of asexually reproduced plant | A newly bred rose or fruit-tree variety |
Patentability Requirements
Not every new idea can be patented. An invention must clear several hurdles set by federal patent law.
Patent-Eligible Subject Matter and Utility
The invention must fall within a category of patent-eligible subject matter and have a useful purpose. Abstract ideas, laws of nature, and natural phenomena, standing alone, are not patentable.
Novelty
The invention must be new. If it was already known, used, patented, or described in a printed publication before the relevant filing date — collectively called "prior art" — it lacks novelty and cannot be patented.
Non-Obviousness
Even if technically new, the invention cannot be an obvious variation of what already exists. The standard asks whether the invention would have been obvious to a person having ordinary skill in the relevant field at the time. This non-obviousness requirement is often the most difficult to satisfy.
Enablement and Definite Claims
The application must describe the invention clearly enough to enable a skilled person to make and use it, and the claims must define the invention with sufficient precision so the public knows the boundaries of the patent rights.
Related Terms
Have an Invention to Protect?
A patent attorney can assess patentability and file with the USPTO on your behalf
Explore Business LawWhen You Need a Lawyer
Patent law is highly technical, deadline-driven, and unforgiving of mistakes, so it is one area where professional help is almost essential. You should consult a patent attorney or registered patent agent if you have an invention you want to protect or if you have received an infringement claim. A professional can:
- Search prior art and assess whether your invention is likely patentable
- Draft a strong specification and claims that define and protect your invention
- Prosecute the application before the USPTO and respond to examiner rejections
- Advise on filing deadlines and the risks of public disclosure
- Enforce your patent or defend against infringement allegations in federal court
Patents work alongside other protections, so it helps to understand the full picture in our entry on intellectual property. Before engaging counsel, review our guide to understanding legal fees.
Frequently Asked Questions
What is a patent?
A patent is a federal grant of exclusive rights to an inventor for a limited period, in exchange for publicly disclosing how the invention works. It allows the patent holder to exclude others from making, using, selling, offering to sell, or importing the patented invention without permission. Patents are governed by federal law and are issued by the U.S. Patent and Trademark Office.
What are the main types of patents?
There are three main types of U.S. patents. A utility patent protects the way an invention works or is used, such as a new machine, process, or composition of matter. A design patent protects the ornamental, non-functional appearance of an article. A plant patent protects new and distinct varieties of asexually reproduced plants. Utility patents are by far the most common.
What does it take to get a patent?
To be patentable, an invention generally must fall within patent-eligible subject matter and be useful, novel (new compared to what already exists), and non-obvious to a person skilled in the relevant field. The inventor must also file an application with the U.S. Patent and Trademark Office that describes the invention clearly enough to enable others to make and use it, and that defines the claimed invention in patent claims.
How long does a patent last?
A utility patent generally lasts 20 years from the date the application was filed, and a design patent lasts 15 years from the date it is granted, both subject to applicable rules and, for utility patents, maintenance fees. After a patent expires, the invention enters the public domain and anyone may make and use it freely.
What is the difference between a patent, a copyright, and a trademark?
A patent protects inventions and useful processes. A copyright protects original creative works such as books, music, and art. A trademark protects brand identifiers such as names and logos that indicate the source of goods or services. All three are types of intellectual property, and patents, copyrights, and trademarks are governed primarily by federal law.