The belief that "marks in different classes never conflict" is one of the most widespread misconceptions among applicants. The following case shows how cross-class similarity leads to rejection; the parties' information has been anonymized.
Case Reconstruction
A household goods company successfully registered its trademark in Class 21 for kitchen utensils. After several years of operation, it expanded its product line and filed an application for the same mark in Class 11 covering related electrical appliances. The company reasoned that, because it already held a Class 21 registration and Class 11 was a different class, the application should proceed smoothly.
The examination outcome was a rejection: the cited mark was a similar trademark previously registered by another party in Class 11, and the word elements of the two marks were close. More critically, when the company had filed in Class 21 it had searched only that class and had never discovered the prior trademark; the moment the product line extended into Class 11, the obstacle immediately surfaced.
Where the Problem Lay
First, the search was confined to the applicant's own class. The Classification of Similar Goods and Services contains cross-class cross-reference notes for many goods; kitchen utensils and certain kitchen appliances are highly related in function, sales channels, and consumer base, and examination has consistently applied a strict standard. A single related-class search at the time of the initial filing would have revealed the hidden risk in advance.
Second, the layout lacked foresight. When registering in its core class, the company focused only on existing products and reserved no class coverage for future line extensions; by the time it wanted to expand, the related class had already been occupied by someone else.
Third, it mistakenly assumed that its own prior registration could clear the way. An applicant's existing registration in a different class cannot override a third party's prior rights in the target class; examination still proceeds on the basis of priority of filing and likelihood of confusion.
Available Remedies
The remedies for this type of situation include: arguing that the goods are not similar or that the marks are not similar, and filing a review of rejection; filing a non-use cancellation action (three consecutive years of non-use) against a cited mark that has been registered for three years with no trace of use, then re-filing once the obstacle is cleared; or negotiating an assignment with the owner of the cited mark. The cost and success rate of each path differ greatly, depending on the cited mark's actual use and legal status.
Takeaway
A mistake in class layout does not surface in the year of registration; it erupts when the business expands. The cost of one additional related-class search at filing time is far lower than the cost of clearing obstacles or rebranding afterward.
If you need assistance with the above procedures, you can book a trademark registration assessment with a record-filed agent on MyTMBee, with full assistance from document preparation to filing follow-up.