Pinterest, the social networking site where users can “pin” items to various interest boards, has an estimated value of more than $11 billion. There is no doubt that its 70 million users identify the “Pin” and “Pin it” marks used on the site. But all of that notoriety and widespread use did not prevent it from losing two important trademark battles over exclusive right to use the word “pin” in connection with its various services.

Who hasn't heard of Pinterest? Read more about the battle of the pin.

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In addition to Thriving Attorney, Darin M. Klemchuk is founder of Klemchuk LLP, a litigation, intellectual property, and transactional law firm located in Dallas, Texas.  He also co-founded Project K, a charity devoted to changing the world one random act of kindness at a time.  Click to read more about Darin Klemchuk's practice as an intellectual property lawyer..