In May, Taco Bell filed a petition with the U.S. Patent and Trademark Office, claiming that ‘Taco Tuesday’ is a common phrase and that any restaurant should be able to use it. The trademark owners—Taco John’s and Gregory’s Restaurant & Bar— have both moved to fight back in court to protect their exclusive rights. WSJ’s Joseph De Avila breaks down the clash of the taco titans. Further Reading: - The Battle for Taco Tuesday Gets Heated  - The Long Fight Over ‘Taco Tuesday’  Learn more about your ad choices. Visit megaphone.fm/adchoices