Similar Marks Analysis: How to Find, Compare, and Assess Trademark Conflicts

A trademark examiner issues a Section 2(d) refusal citing a mark you have never seen. Your client asks whether a competitor's new filing poses a real threat or just looks similar on paper. A brand manager wants to know, before filing, whether the name they picked will survive examination.

Each of these scenarios requires the same underlying capability: the ability to find marks that are similar to a given mark, understand how they are similar, and assess whether the similarity rises to the level of likely confusion.

GleanMark provides three tools that work together to answer these questions — the Similar Marks tab for discovery, the Compare page for structured side-by-side analysis, and DuPont confusion analysis for full 13-factor risk assessment.

The Problem: Text Search Misses the Marks That Matter Most

The most dangerous trademark conflicts are not identical matches. They are the marks that sound alike, look alike, or cover overlapping goods — but differ just enough that a keyword search will not find them.

Consider a new filing for BLOBLAB in Classes 9 and 41 for downloadable software and entertainment services. A text search for "BLOB LAB" (with a space) might miss BLOBLAB (no space). A search for "BLOBLAB" might miss BLOBLOCK or GLOBLAB. Neither search would surface BLOBLAAB — a visual near-match that an examiner would absolutely flag.

Traditional trademark search tools rely on exact text matching or basic wildcard patterns. This approach catches identical marks but fails on the three similarity dimensions that actually drive Section 2(d) refusals:

• Phonetic similarity — marks that sound alike when spoken (NOVVA / NOVA, KLEAR / CLEAR, FYND / FIND)
• Visual similarity — marks that look alike on paper or screen (BLOBLAB / BLOB LAB, RAMPSHIELD / RAMPSHELD)
• Goods and services overlap — marks in related Nice classes or with overlapping goods descriptions, even when the marks themselves differ

The USPTO examines all three dimensions. Your similarity analysis tools should too.

How Similar Marks Discovery Works

When you view any trademark in GleanMark, the Similar Marks tab shows every live mark in the database that might conflict — ranked by a composite similarity score that weighs phonetic, visual, and class-based signals.

What the System Evaluates

The scoring engine runs a multi-step analysis against the full 4.5 million live trademark records:

Similarity Dimension	Method	What It Catches
Phonetic	Metaphone encoding + word-level phonetic matching	NOVVA/NOVA, KLEAR/CLEAR, sound-alikes across languages
Visual (character-level)	Levenshtein distance + trigram analysis	BLOBLAB/BLOB LAB, transpositions, missing/extra characters
Containment	Prefix, suffix, and substring matching	AQUABRASS XPRESS contains AQUABRASS
Exact	Case-insensitive exact match	Identical marks filed by different owners
Class overlap	Nice class intersection + coordinated class expansion	Same class = higher threat; related classes still flagged
Goods keyword overlap	Keyword extraction from G&S descriptions	Marks in different classes but with overlapping goods language

Scores range from 0.00 to 1.00 and are grouped into four tiers:

Score Range	Level	Meaning
0.85 – 1.00	Very High	Near-identical marks — likely examiner citation
0.74 – 0.84	High	Strong similarity — warrants investigation
0.63 – 0.73	Medium	Moderate similarity — review recommended
0.50 – 0.62	Low	Possible similarity — monitor but lower priority

Each result row shows the similarity score with a tooltip explaining which method produced the match (phonetic, trigram, Levenshtein, containment, etc.), so you can immediately understand the nature of the conflict.

What You See in the Similar Marks Tab

Every result includes nine columns of data:

• Mark name — the potentially conflicting mark
• Serial number — with hover preview card
• Nice classes — first three shown, with "+N more" for marks in many classes
• Owner — with link to owner profile; same-owner icon when applicable; "Notable" badge for owners with 3+ registrations
• Status — Registered or Pending, with ITU badge where relevant
• Filing date
• Goods/services — truncated with full text on hover
• Similarity score — color-coded badge with method tooltip
• Actions — track the mark for monitoring, or launch a DuPont confusion analysis

You can hide marks owned by the same entity (useful when a parent company owns dozens of related marks) and create a watch search directly from the tab to monitor for future filings with similar names.

How Mark Comparison Works

Discovery tells you which marks are similar. Comparison tells you how they differ.

The Compare page lets you place up to five trademarks side by side in a structured table. Every relevant attribute appears in its own row, with each mark in a column:

Attribute	What It Shows
Status	Live/Dead with color coding
Mark Category	Trademark, Service Mark, Collective, Certification
Mark Type	Word, Stylized, Design, Combined
Mark Image	USPTO mark image (design marks)
Serial Number	With link to detail page
Registration Number	If registered
Owner	Full entity name
Nice Classes	With full class descriptions
Goods & Services	Complete G&S text
Filing Date	Application filing date
First Use Date	Date of first use in commerce
Registration Date	If registered
Current Basis	Filing basis (use in commerce, ITU, Section 44, etc.)
TTAB Activity	Active proceedings, if any

Building a Comparison

There are two ways to build a comparison:

1. From search results. Check the compare checkbox on any mark in search results, the Similar Marks tab, or the knockout search. Selected marks appear in a comparison tray at the bottom of the screen. Click "Compare" to open the full comparison page.

2. Via URL. Share a comparison directly: /compare?serials=99500916,97391798 loads BLOB LAB vs BLOBLAB instantly. Useful for sending a comparison to a colleague or client without requiring them to reproduce your search.

Comparisons can be exported to CSV or RTF for inclusion in client reports or internal memos.

When to Use Compare vs. DuPont Analysis

Compare is for structured fact-finding — seeing the data side by side to understand where marks overlap and where they diverge. It takes seconds and requires no AI processing.

DuPont analysis is for legal risk assessment — a full 13-factor evaluation that weighs the facts against the likelihood-of-confusion framework. It takes 60–90 seconds and produces a scored, cited report.

Use Compare first to triage. Use DuPont analysis on the conflicts that warrant deeper investigation.

How DuPont Confusion Analysis Works

When a similar mark warrants more than a side-by-side comparison, DuPont confusion analysis provides a structured risk assessment based on the 13-factor test from In re E. I. du Pont de Nemours & Co., 476 F.2d 1357 (CCPA 1973).

Triggering an Analysis

You can launch a DuPont analysis from three places:

1. Similar Marks tab — click the compare icon on any similar mark row
2. Compare page — when exactly two marks are selected, the "Run Confusion Analysis" button appears
3. Analysis history — start a new analysis from /confusion-analysis/history

The analysis is asynchronous. After you confirm the two marks, the system runs a three-stage pipeline:

Stage	What Happens	Time
USPTO Fetch	Retrieves full prosecution history and XML data for both marks	~20s
Market Research	Web research for market intelligence, trade channels, consumer context	~30s
AI Synthesis	Applies the 13-factor DuPont framework to produce scored analysis	~30s

Total time: approximately 60–90 seconds. A progress bar shows real-time status.

What the Report Contains

Overall risk assessment. A risk level (Low, Moderate, High, or Very High) with a numerical score and narrative summary explaining the key risk drivers.

Scored DuPont factors. Each evaluable factor receives a score from 0 to 100, displayed as a card with:

• Factor name and qualitative label (e.g., "Very Similar," "Moderately Related")
• Score bar visualization
• Analysis narrative explaining the reasoning
• Evidence citations linked to source documents ([PH-1] for prosecution history, [MR-1] for market research)

The dominant factors — similarity of marks (Factor 1) and similarity of goods/services (Factor 2) — are weighted more heavily, consistent with how the TTAB and federal courts apply the test.

Evidence-unavailable factors. Factors that require evidence not available in the USPTO record (actual confusion surveys, detailed market interface data) are listed separately with explanations of what evidence would be needed.

Sharing and export. Every analysis can be shared via a public URL (no login required for the recipient), downloaded as PDF, or saved to your files. Over 400 analyses have been run on the platform to date.

For a detailed walkthrough of the 13 DuPont factors and how attorneys use them to overcome Section 2(d) refusals, see DuPont Factors Explained: Winning Likelihood-of-Confusion Trademark Refusals.

Real Example: BLOB LAB vs. BLOBLAB

Here is how the three tools work together on a real trademark conflict.

Discovery. Viewing the Similar Marks tab for BLOB LAB (S/N 99500916, Classes 9, 28, 41 — downloadable software, toys, entertainment) surfaces BLOBLAB (S/N 97391798, Classes 9, 25, 36, 41 — software, clothing, financial, entertainment) with a high similarity score based on character-level analysis and class overlap in Classes 9 and 41.

Comparison. Placing both marks on the Compare page reveals:

Attribute	BLOB LAB	BLOBLAB
Mark	BLOB LAB	BLOBLAB
Serial	99500916	97391798
Owner	BLOB LAB LLC	Crypto Fun Factory, LLC
Classes	009, 028, 041	009, 025, 036, 041
Filing Date	Nov 2025	Jun 2023
Status	Pending	Pending

The comparison immediately shows the class overlap (009 and 041) and different owners — two key inputs for confusion analysis.

DuPont analysis. Running the full 13-factor analysis on these two marks produces a scored report evaluating mark similarity (the marks are visually and phonetically near-identical), goods overlap (both cover software and entertainment), trade channel overlap, and all remaining applicable factors.

This three-step workflow — discover, compare, assess — turns what would be hours of manual research into minutes of structured analysis.

Who This Is For

Trademark Attorneys Responding to Office Actions

When an examiner cites a mark in a Section 2(d) refusal, you need to understand the cited mark thoroughly: its goods, its classes, its prosecution history, and how it compares to your client's mark on every relevant dimension. The Similar Marks tab shows you what the examiner found. The Compare page lays it out side by side. The DuPont analysis gives you a structured framework for your response arguments. (For strategies on overcoming these refusals, see How Attorneys Beat Section 2(d) Refusals.)

Brand Managers Evaluating New Names

Before committing to a new brand name, you want to know what is already out there. The Similar Marks tab surfaces conflicts that keyword searches miss. The Compare page lets you evaluate the top threats quickly. If any conflict looks serious, a DuPont analysis provides the documented risk assessment your legal team needs to make a go/no-go decision.

IP Counsel Managing Portfolios

When a watch alert fires for a new filing similar to one of your client's marks, the question is always: how serious is this? The workflow from alert to Similar Marks tab to DuPont analysis gives you a structured triage path — dismiss low-risk alerts quickly, escalate high-risk ones with evidence already assembled.

Getting Started

1. Search for any trademark at GleanMark Search and click through to the detail page. The Similar Marks tab is on every trademark detail view.

2. Select marks to compare. Check the compare box on any marks in search results or the Similar Marks tab. Up to 5 marks can be compared at once.

3. Run a DuPont analysis on the most concerning conflict. Click the compare icon in the Similar Marks tab or the "Run Confusion Analysis" button on the Compare page.

4. Share the results. Every DuPont analysis can be shared via a public link — send it to a colleague or client without requiring an account.

The Similar Marks tab and Compare page are available on Professional and Firm plans. DuPont confusion analysis is available on Starter plans and above (1 analysis/month on Starter, 5/seat/month on Professional, unlimited on Firm). Visit Pricing for details.

For pre-filing clearance searches, see the Knockout Search guide. For monitoring new filings that match your marks, see Trademark Watch Alerts. For examiner-grade structured searches, see the TESS Search guide.