What Is a Trademark? What It Protects, What It Costs, and When You Need One

There are over 2.9 million active trademark registrations in the United States alone. That number grows by roughly 612,000 new applications every year. If you are building a product, launching a brand, or naming a company, trademarks are not an abstract legal concept. They are the system that determines whether you get to keep your name.

So what is a trademark? Most people think of it as protection against copying. That framing misses what trademarks actually do. A trademark does not prevent someone from using the same word you use. It prevents someone from using a similar enough mark, on similar enough goods or services, that consumers would be confused about who made what. That distinction, between duplication and confusion, shapes every decision in the trademark system.

What Is a Trademark?

A trademark is any word, phrase, symbol, design, sound, color, or combination of these that identifies and distinguishes the source of goods or services. When you see a swoosh on a shoe, you know Nike made it. When you hear the NBC chimes, you know you are watching NBC. That instant recognition is what a trademark protects: the link between a mark and its source.

The legal trademark definition comes from the Lanham Act, the federal statute governing US trademark law. Section 45 defines a trademark as anything that identifies and distinguishes goods from those manufactured or sold by others and indicates the source of the goods. The key phrase is "source identification": a trademark does not give you ownership of a word in all contexts. It gives you the exclusive right to use that word (or symbol, or sound) as an identifier of your particular goods or services.

A few trademark examples show how this works in practice. DELTA is a registered trademark for both an airline and a faucet manufacturer. DOVE covers both chocolate and soap. These coexist because consumers are unlikely to confuse an airline with a plumbing company. Trademark protection is always tied to what you sell and who your buyers are.

A few related concepts are worth distinguishing early:

• A service mark is functionally identical to a trademark but applies to services rather than goods. "FedEx" for shipping services is a service mark. In practice, the term "trademark" is used to cover both, and the legal protections are the same.
• Trade dress protects the overall visual appearance of a product or its packaging, things like the distinctive shape of a Coca-Cola bottle or the layout of an Apple Store. Trade dress is harder to register and harder to enforce, but it falls under the same body of law.

Registering a business name with your state, buying a domain, or forming an LLC does not create a trademark. Those are administrative acts. A trademark arises from use in commerce, the moment you start selling goods or services under a distinctive name. Federal registration strengthens those rights, but the state filing that created your LLC did nothing for your trademark position. For a detailed trademark vs copyright comparison (including patents), see how trademarks differ from patents and copyrights.

Types of Trademarks and the Distinctiveness Spectrum

Not all trademarks are equally strong. US trademark law organizes marks along a distinctiveness spectrum, a hierarchy that determines how much legal protection a mark receives. Understanding this spectrum matters because it directly affects whether your mark can be registered and how easy it will be to enforce.

The five levels, from weakest to strongest:

1. Generic terms are the common name for the product itself. "Computer" for computers, "coffee" for coffee. Generic terms cannot be trademarked, period. This is why former trademarks like "aspirin" and "escalator" lost protection: the brand name became the word people used for the product category itself.

2. Descriptive marks directly describe a feature, quality, or characteristic of the goods. "Cold and Creamy" for ice cream, "Best Buy" for a retailer. Descriptive marks are not registrable unless they acquire secondary meaning, which means consumers have come to associate the term with a specific source through years of use and advertising. This is an uphill battle.

3. Suggestive marks hint at a quality of the goods without directly describing them. "Netflix" suggests internet movies. "Coppertone" suggests sun protection. Suggestive marks are registrable without proving secondary meaning, which makes them the sweet spot for many brands.

4. Arbitrary marks are real words used in a context that has nothing to do with their dictionary meaning. "Apple" for computers. "Shell" for gasoline. The word exists, but its meaning has no connection to the product. These are strong marks.

5. Fanciful marks are invented words with no meaning outside the brand. "Xerox," "Kodak," "Exxon." These are the strongest possible marks because there is no pre-existing meaning to dilute. The tradeoff is that a fanciful mark requires more marketing investment to become recognizable.

The practical lesson for anyone naming a product: pick a name higher on the spectrum. A fanciful or arbitrary name is easier to register, easier to defend, and harder for competitors to work around. A descriptive name will cost you years of effort and legal fees to protect, if it can be protected at all.

Three trademark symbols communicate trademark status:

• TM signals that someone is claiming trademark rights in a mark, whether or not it is registered. Anyone can use the TM symbol.
• SM is the service mark equivalent of TM, used for services rather than goods.
• The registered symbol can only be used after a mark is federally registered with the USPTO (or the relevant national office). Using it before registration is technically a violation of federal law, though enforcement is rare.

What Trademarks Protect (and What They Do Not)

Trademark rights are territorial. A US registration protects you in the United States. It does nothing in Europe, Asia, or anywhere else. If you sell internationally, you need protection in each market, either through direct filings with national offices or through the Madrid Protocol, the international treaty system administered by WIPO that allows a single application to designate protection in over 130 member countries. The Madrid Protocol simplifies multi-country filing, but each designated country still examines the application under its own laws.

Within a given country, trademark protection is organized by product and service categories through the Nice classification system, an international framework that divides all commercial goods and services into 45 classes. Classes 1 through 34 cover goods (chemicals, paints, machinery, electronics, clothing, and so on); classes 35 through 45 cover services (advertising, insurance, telecommunications, education, and more).

A trademark registration covers the specific classes in which it is filed. This is why DELTA can operate as both an airline (Class 39, transportation services) and a faucet company (Class 11, plumbing fixtures) without conflict. For a deeper look at how the class system works, see this guide to Nice classification.

The standard for infringement is likelihood of confusion: would a reasonable consumer encountering both marks believe they come from the same source, or that one is affiliated with the other? Courts evaluate this through multi-factor tests (the US uses the DuPont factors, a 13-part analysis covering similarity of marks, similarity of goods, trade channels, consumer sophistication, and more). The test is not whether the marks are identical. It is whether they are similar enough, used on related enough goods, to cause confusion.

What trademarks do not protect:

• Ideas or concepts. You cannot trademark an idea. You can trademark the specific name or logo you use to market a product based on that idea.
• Functional features. If a product feature is essential to the product's use or purpose, trademark law will not protect it. That is the domain of patent law.
• Generic terms. Once a term becomes the generic name for a product category, it cannot function as a trademark. This is why "thermos" and "zipper" lost their trademark status in the US.
• Facts or information. Factual content cannot be trademarked (or copyrighted, for that matter).

How Trademark Registration Works

You do not need to register a trademark to have one. In the United States, common law trademark rights arise automatically the moment you use a distinctive mark in commerce. If you start selling software under the name LUMINEX tomorrow, you have trademark rights in that name in the geographic area where you do business.

The problem with common law rights is their limitations. They extend only to the geographic area where you have actually used the mark and built a reputation. They provide no presumption of ownership in court. They cannot be recorded with US Customs to block counterfeit imports. They provide no basis for international filing.

Federal registration with the USPTO changes all of this. It gives you nationwide priority (dating back to your filing date), a legal presumption of validity, access to federal courts, the ability to use the registered symbol, and a basis for filing internationally through the Madrid Protocol. For most businesses that operate beyond a single city, federal registration is worth pursuing.

The registration process at the USPTO follows a defined sequence:

1. Clearance search. Before filing, search existing registrations and pending applications to identify potential conflicts. This step is optional but failing to do it is the single most common cause of wasted filing fees.
2. File the application. Submit through the USPTO's Trademark Electronic Application System. Filing fees are $250 per class (TEAS Plus, which requires selecting goods and services from a pre-approved list) or $350 per class (TEAS Standard, which allows free-form descriptions).
3. Examination. A USPTO examining attorney reviews the application for compliance with statutory requirements, typically 3 to 4 months after filing. If there are issues, the examiner issues an office action, and you have 3 months to respond.
4. Publication. Approved applications are published in the Official Gazette for a 30-day opposition period. Approximately 3% of published marks face a formal opposition (a challenge from a third party arguing the mark should not register).
5. Registration. If no opposition is filed (or if you prevail), the mark registers. The entire process typically takes 12 to 18 months.

The total cost depends on how you file. Government fees are $250 to $350 per class. An attorney typically charges $1,000 to $2,500 for a straightforward application, including the clearance search. Contested applications, those that receive office actions or face opposition, cost more. For a full cost breakdown, see how much a trademark costs. For a step-by-step walkthrough of the process, the trademark registration guide covers each stage in detail.

Do You Need a Trademark?

Not every business needs a federal trademark registration. But most businesses that are growing beyond their initial market do.

Here are the signals that registration makes sense:

• You are launching a consumer-facing brand. If customers will choose your product based on its name, that name is an asset worth protecting.
• You are expanding nationally. Common law rights are geographically limited. The moment you start selling across state lines or online to a national audience, you need nationwide protection.
• You are raising capital. Investors and acquirers expect a clean IP portfolio. An unregistered trademark is a liability in due diligence.
• You are selling online. E-commerce is inherently national (and often international). If your brand exists on Amazon, Shopify, or any platform with national reach, you need national protection to match.

The risk of not registering is straightforward. Without federal registration, you have limited geographic rights, no presumption of ownership, and a harder time enforcing against infringers. If a competitor registers a similar mark before you do, you may find yourself unable to expand into new markets, or forced to rebrand entirely. Rebranding a company with established market presence costs tens of thousands of dollars at minimum, and the loss of brand equity is incalculable.

The math favors early registration. A federal trademark costs between $250 and $2,500, depending on the filing method and whether you use an attorney. A forced rebrand after a cease-and-desist letter can run $25,000 to $100,000 or more when you factor in new packaging, updated marketing materials, SEO recovery, and lost customer recognition. Spending $1,500 on a clearance search and filing is insurance against a six-figure problem.

If you sell internationally or plan to, the Madrid Protocol makes multi-country protection significantly more accessible. A single international application, filed through WIPO, can designate protection in any of over 130 member countries. The alternative, filing separately in each country, is slower and more expensive. International filing strategy is complex enough to deserve its own treatment, but the key point is that the system exists and it is more accessible than most founders assume.

One more number worth knowing: a US trademark registration lasts 10 years and is renewable indefinitely, as long as you continue using the mark and file the required maintenance documents. The cost of renewal is modest compared to the cost of the initial filing. The trademark duration guide covers the specific deadlines and maintenance requirements.

Trademark law is a specialized field, and the advice above is educational, not legal counsel. Before filing, consult a trademark attorney who can evaluate your specific situation, conduct a professional clearance search, and advise on filing strategy. The cost of an attorney consultation is trivial compared to the cost of filing incorrectly.

Next Steps

If you are considering trademark protection, the first step is a trademark search. A thorough search of existing registrations and pending applications tells you whether your proposed mark is available before you spend money on a filing. The guide to trademarking a name walks through the process from search to registration.

After the search, consult a trademark attorney. A qualified attorney can interpret search results, advise on the strength of your proposed mark, and handle the filing process. The investment is small relative to what is at stake. If you are ready to start searching trademark data programmatically, Signa provides an API for trademark search across 200+ jurisdictions.