The applications (via Siliconera) were filed with the United States Patent & Trademark Office on September 2.
No other information is available and a representative for the company declined to comment.
Earlier this year, Zenimax filed a trademark application for Starfield.
One of Bethesda's newest development teams, the Austin, Texas-based Battlecry Studios, is currently working on a new free-to-play game that aims to "redefine" the free-to-play sector. This game has not been announced.
GameSpot parent company CBS CEO Les Moonves is a member of the Zenimax Media Board of Directors.