 Shares of Nordstrom Inc. JWN, 3.92 slipped 0.3 in premarket trading Tuesday, after the higher-end department store chain said it adopted a shareholder rights plan, also known as a poison pill, that is effective immediately and lasts for one year. Nordstrom said the rights plan, which becomes exercisable if a person or entity acquires 10 or more of the shares outstanding, has not been adopted in response to any specific takeover bid or other bid to take control of the company, and was not adopted to block offers that are deemed fair. 