It turns out that “Taco Tuesday” is a trademark owned by a fast food chain from Wyoming, Taco John's. The mark, filed on March 23, 1989 and registered with the U.S. Patent and Trademarks Office (USPTO) under registration number 1,572,589, covers “restaurant services” in international class 42. The only exception in the country-wide registration is the state of New Jersey, where the same mark owned by a different restaurant preceded it.
This registration has caused an online stir after Freedom’s Edge Brewing Co., located five blocks from the taco chain’s national headquarters, received a cease and desist letter. The warning was for a sign advertising an unaffiliated food truck that parks outside of the establishment weekly.
The Wyoming brewing company posted on their Facebook July 31, the day after receiving the letter, “Just to clear things up, we have nothing against Taco John's, but do find it comical that some person in their corporate office would choose to send a cease and desist to a brewery that doesn’t sell or profit from the sales of tacos.”
While the company says the term is part of the company’s “DNA,” others argue that the slogan is no longer distinctive of Taco John's due to its widespread usage. "Taco Tuesday" has its own Wikipedia entry mentioning its widespread usage in restaurants, LeBron James is in headlines celebrating it, not to mention references from pop culture such as the Simpsons.
In other words, the Taco Tuesday mark may have suffered "genericide". For more information on "genericide" and how to avoid it, please visit INTA's guide here.