LAW 783-001 – Trademark Law and Practice

Trademark Infringement


Trademark infringement is the violation of another's trademark rights by using the mark without authorization.

The basic test for infringement is "likelihood of confusion."

An infringing use of a trademark must be a "use in commerce."

Likelihood of Confusion

Each circuit has its own test to determine the likelihood of confusion.

There are some factors that are common to most of these tests however:

  • Similarity of the marks
  • Proximity of the goods or services
    • Whether the products are sufficiently related in the mind of the consumer
  • Strength of the plaintiff's mark
  • Actual confusion
  • Defendant's intent
Contributory Infringement

Contributory infringement occurs when one induces another to infringe yet another's trademark or continues to supply his product to one that he knows or should have known is infringing upon another's trademark.