Ohio State has filed an action against Oklahoma to the Trademark Trial and Appeal Board. The item in question? A block "O."
The notice of opposition was filed last week. Ohio State uses the block "O" as its primary logo, and the school extensively outlines the history of its use in the action.
The University of Oklahoma Board of Regents filed a trademark application for the mark in December 2017. OU claims its block "O" has been in commercial use since 2001. The mark is most noticeable to Sooner fans as the logo on the chest of the drum major.