A thorough trademark search in Colorado means checking three separate layers of records: the Colorado Secretary of State’s business database, the federal USPTO trademark database, and unregistered “common law” marks in actual use online and in local commerce. Skipping any one of them creates real risk, because a conflicting mark you didn’t find can still block your registration or trigger an infringement claim later. None of the three layers is optional, and none of them alone is enough.
Start With the Colorado Secretary of State Database
The Colorado Secretary of State handles all state-level trademark registrations, and its online database is the natural first stop. The advanced search tool at sos.state.co.us lets you search separately by business name, trade name, or trademark.1Colorado Secretary of State. Colorado Secretary of State – Advanced Search You can also reach it by selecting “Search business database” from the Business Organizations page.2Colorado Secretary of State. Business FAQs – Trademarks
Do not stop at exact matches. The real threats come from marks that sound similar, look similar, or carry the same meaning as yours. Try phonetic spellings, common misspellings, abbreviations, and synonyms. A search for “Greenleaf” should also cover “Green Leaf,” “Greanleaf,” and conceptual equivalents like “Verdant Leaf.” Results show the owner, the registration date, and the goods or services the mark covers. That last detail matters most: two identical marks can coexist if they cover completely unrelated products.
Trade Names Are Not Trademarks
The Colorado database contains both trade names and trademarks, and confusing the two is a common early mistake. A trade name identifies a business entity itself. A trademark identifies the source of specific goods or services. The Secretary of State’s own guidance is direct on the point: a business name is generally not eligible for trademark registration unless it is used in advertising or placed on goods to identify their source.2Colorado Secretary of State. Business FAQs – Trademarks
Check both categories anyway. A registered trade name matching your proposed trademark won’t automatically block you, but it tells you someone is already operating under that name in Colorado. If they’re also using it on products or in advertising, they may hold common law trademark rights even with no formal trademark filing on record.
Search the Federal USPTO Database
Federal searching is not optional, even if you only plan to operate inside Colorado. Under the Lanham Act, filing a federal trademark application gives the applicant nationwide priority that can override a later state registration.3Office of the Law Revision Counsel. 15 USC 1057 – Certificates of Registration A business in another state that registered federally before you filed in Colorado can force you to stop using your mark, even if it has never done business here.
The USPTO replaced its older TESS system with a newer search tool at tmsearch.uspto.gov. Search both registered marks and pending applications. Pending matters because an intent-to-use filing that eventually registers claims priority back to its original filing date, so a name that looks “available” today may already be spoken for by an application filed months ago.4United States Patent and Trademark Office. Trademark Applications – Intent-to-Use (ITU) Basis
Narrow by International Class
Every trademark application classifies its goods or services under the International (Nice) Classification system, which groups similar products into numbered classes.5United States Patent and Trademark Office. Nice Agreement Current Edition Version – General Remarks, Class Headings and Explanatory Notes Filtering to the class you’ll be filing in helps cut out marks that share your name but cover unrelated products. A clothing brand would check Class 25 (clothing, footwear, headwear). Class alone isn’t enough, though. Related goods across different classes can still conflict. A beverage company in Class 32 could oppose a bar or restaurant in Class 43 if consumers might reasonably assume the two are connected.
Use Wildcards and Field Tags
The USPTO search system supports Boolean operators (AND, OR, NOT) along with field tags that target specific parts of a record. The [ic] tag searches within a particular international class, [on] searches owner names, and [gs] searches the description of goods and services. Truncation with the asterisk (*) or dollar sign ($) works as a wildcard, which is essential for catching spelling variations: “GR$N” returns “GREEN,” “GRAIN,” “GRIN,” and similar variants.6United States Patent and Trademark Office. Trademarks Advanced Searching
Pattern matching helps most with phonetic near-misses. The {v} operator substitutes any vowel, so “GR{v}N” catches “GRAN,” “GREN,” “GRIN,” and “GRUN” in a single query. These aren’t power-user tricks. They’re how you catch the near-misses that create real legal problems.
Search Logos With Design Codes
Word marks are only half the picture. If your proposed trademark includes a logo, symbol, or other design element, search using design search codes. Each design element is classified by a six-digit number: the first two digits are a broad category (like “animals”), the next two a division (like “birds”), and the last two a specific section (like “eagles”). The USPTO maintains a Design Search Code Manual at tmdesigncodes.uspto.gov for finding the right codes.7United States Patent and Trademark Office. Design Search Codes
Break the logo into its most prominent visual elements first, then look up a code for each one. A logo featuring a mountain and a pine tree calls for two separate code searches. You can also search a design’s text description with the [de] field tag, though design codes usually produce more complete results.
Check for Unregistered Common Law Marks
Neither the Colorado database nor the USPTO captures every mark in use. Trademark rights in the United States arise from actual use in commerce, not from registration. A business that has been selling under a particular name in Denver for years may hold enforceable rights in that geographic area with no formal filing at all. Federal law recognizes this: a prior user already using a mark before someone else filed a federal application keeps rights in the territory where it was already using the mark.3Office of the Law Revision Counsel. 15 USC 1057 – Certificates of Registration
Finding these marks takes ordinary internet research. Run searches on Google, Bing, and social media using your proposed mark and its variations. Check domain registrations through WHOIS lookups, online marketplaces like Amazon and Etsy, industry directories, and business filings in neighboring states. Pay particular attention to businesses offering similar goods or services in Colorado or in overlapping markets. A common law user in your geographic area and industry is a genuine threat even though nothing about them shows up in an official database.
Common law rights are geographically limited to where the mark is actually used, so a small business using your proposed name in rural Maine probably poses no real conflict with your Colorado operation. A business using the name anywhere along the Front Range almost certainly does. Judgment matters here more than any database search.
Judging Whether a Result Is a Conflict
Every trademark conflict comes down to one question: would consumers likely confuse the two marks? This standard, known as likelihood of confusion, is the most common reason the USPTO refuses registration and the foundation of every infringement claim.8United States Patent and Trademark Office. Likelihood of Confusion
The analysis reaches further than whether two marks look or sound identical. Courts and trademark examiners weigh how similar the marks are in appearance, sound, and meaning; how related the goods or services are; how similar the trade channels and customers are; and the strength of the existing mark. Two marks can be spelled differently and still create confusion if they sound alike out loud. “Kleen” and “Clean” on the same type of product would almost certainly be found confusingly similar.
When you review search hits, flag anything in the same or a related class that shares phonetic similarity, visual similarity, or conceptual overlap with your proposed mark. One strong match in a related product category is enough to create a serious problem, even if the spelling is different.
After a Clean Search
If nothing in the three layers raises a real conflict, registration costs are modest. Colorado charges a $30 online filing fee for a new state trademark; paper filing is not available.9Colorado Secretary of State. Business Organizations Fee Schedule The USPTO charges $350 per class of goods or services for a standard federal application, so a brand covering products in two Nice classes pays the fee twice. Intent-to-use applicants pay additional fees later when they file a statement of use proving the mark is actually in commerce.4United States Patent and Trademark Office. Trademark Applications – Intent-to-Use (ITU) Basis The filing fees are small next to what a forced rebrand or an infringement claim would cost, which is the practical case for spending real time on the search before you spend anything on the application.