So this artist founded a company called "Pi Productions Corp," and his trademark is the "pi" symbol followed by a period. His attorney says other t-shirts and merchandise are "confusingly similar" to his client's merchandise.
http://www.wired.co.uk/news/archive/2014-06/02/pi-trademark-usa
http://www.wired.co.uk/news/archive/2014-06/02/pi-trademark-usa
Man trademarks Pi, tries to cut out geeky T-shirt designers
02 June 14 / by Kevin Poulsen
A Brooklyn artist is claiming a broad trademark in T-shirts, jackets, caps, and other apparel featuring the Greek letter, resulting in the mass, temporary removal of thousands of products from the custom t-shirt printing site Zazzle.
At issue is US trademark registration 4,473,631, issued to one Paul Ingrisano, aka "Pi Productions Corp" of New York. In January, the US Patent and Trademark Office gave Ingrisano a trademark on the symbol "π." -- pi followed by a period -- a design Ingrisano uses on T-shirts sold at some brick-and-mortar stores.
When Ingrisano discovered that California-based print-on-demand outlet Zazzle offered an array of clothing items that feature pi -- which represents the ratio of the diameter of a circle to its circumference -- he had attorney Ronald Millet send the company a strongly worded cease-and-desist letter this month demanding their removal....
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