Trademark Class 4: Lubricants & fuels

Class 4 is where brands for goods and services in the "lubricants & fuels" category live. Similar names filed in your class are the real risk — check yours free and watch for new ones.

What Class 4 covers

Class 4 of the international (Nice) trademark classification is Lubricants & fuels. In practice, that's where you'll find brands for goods and services in the "lubricants & fuels" category. Every US trademark application declares one or more of the 45 classes, and the class is what decides whether two similar names actually conflict — DELTA for faucets and DELTA for airlines coexist because they're in different classes.

Why the class matters for monitoring

A new filing that's identical to your name but in an unrelated class is usually a curiosity. A merely similar name filed in Class 4 — your class — can be the real problem. That's why MarkAlarm weights class overlap heavily: same-class look-alikes can reach high-priority alerts, while different-class ones stay low. If your brand lives in Class 4, watching new filings in it is how you catch a conflict inside the 30-day window instead of months later.

Check your name free above, or watch it going forward for $9/month. This is information, not legal advice; the USPTO's ID Manual is the authoritative source for what belongs in each class.