From ArsTechnica:

Shih-Chieh

Who knew? Banking giant Citigroup has trademarked “THANKYOU” and is now suing technology giant AT&T for how it says thanks to its own loyal customers. This is “unlawful conduct” amounting to wanton trademark infringement, Citigroup claims in its federal lawsuit.

Here is a copy (PDF) of the trademark certificates and trademark applications connected to what Citigroup is calling its “THANKYOU Marks.”

According to Citibank’s lawsuit (PDF) lodged Friday in New York federal court:

For many years, Citigroup has used trademarks consisting of and/or containing the term THANKYOU, including THANKYOU, CITI THANKYOU, CITIBUSINESS THANKYOU. THANKYOU FROM CITI, and THANKYOU YOUR WAY, in connection with a variety of customer loyalty, reward, incentive, and redemption programs (collectively, the “THANKYOU Marks”).

In its lawsuit, the financial institution says AT&T is infringing Citigroup’s intellectual property because of AT&T’s brand new marketing campaign (PDF) connected to AT&T’s co-branded, Citigroup credit card called “the AT&T Universal Card.” AT&T is illegally marketing the phrases “thanks” and “AT&T THANKS,” Citigroup claims. This “is likely to cause consumer confusion and constitutes trademark infringement, false designation of origin, and unfair competition in violation of Citigroup’s rights,” the suit says.

Because of “AT&T’s unlawful conduct,” Citigroup wants unspecified damages and is demanding that a federal judge…

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